diff --git a/.gitignore b/.gitignore
index 0a3ededf..79c26177 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ temporalio/bridge/target/
 temporalio/bridge/temporal_sdk_bridge*
 /tests/helpers/golangserver/golangserver
 /tests/helpers/golangworker/golangworker
+/.idea
diff --git a/README.md b/README.md
index bc311e34..55540e11 100644
--- a/README.md
+++ b/README.md
@@ -458,8 +458,8 @@ Some things to note about the above code:
 #### Definition
 
 Workflows are defined as classes decorated with `@workflow.defn`. The method invoked for the workflow is decorated with
-`@workflow.run`. Methods for signals and queries are decorated with `@workflow.signal` and `@workflow.query`
-respectively. Here's an example of a workflow:
+`@workflow.run`. Methods for signals, queries, and updates are decorated with `@workflow.signal`, `@workflow.query`
+and `@workflow.update` respectively. Here's an example of a workflow:
 
 ```python
 import asyncio
@@ -515,6 +515,12 @@ class GreetingWorkflow:
     @workflow.query
     def current_greeting(self) -> str:
         return self._current_greeting
+    
+    @workflow.update
+    def set_and_get_greeting(self, greeting: str) -> str:
+      old = self._current_greeting
+      self._current_greeting = greeting
+      return old
 
 ```
 
@@ -582,6 +588,14 @@ Here are the decorators that can be applied:
   * All the same constraints as `@workflow.signal` but should return a value
   * Should not be `async`
   * Temporal queries should never mutate anything in the workflow or call any calls that would mutate the workflow
+* `@workflow.update` - Defines a method as an update
+  * May both accept as input and return a value
+  * May be `async` or non-`async`
+  * May mutate workflow state, and make calls to other workflow APIs like starting activities, etc.
+  * Also accepts the `name` and `dynamic` parameters like signals and queries, with the same semantics.
+  * Update handlers may optionally define a validator method by decorating it with `@update_handler_method.validator`.
+    To reject an update before any events are written to history, throw an exception in a validator. Validators cannot 
+    be `async`, cannot mutate workflow state, and return nothing.
 
 #### Running
 
@@ -1440,6 +1454,13 @@ to `1` prior to running tests.
 Do not commit `poetry.lock` or `pyproject.toml` changes. To go back from this downgrade, restore `pyproject.toml` and
 run `poetry update protobuf grpcio-tools`.
 
+For a less system-intrusive approach, you can:
+```shell
+docker build -f scripts/_proto/Dockerfile .
+docker run -v "${PWD}/temporalio/api:/api_new" -v "${PWD}/temporalio/bridge/proto:/bridge_new" <just built image sha>
+poe format
+```
+
 ### Style
 
 * Mostly [Google Style Guide](https://google.github.io/styleguide/pyguide.html). Notable exceptions:
diff --git a/scripts/_proto/Dockerfile b/scripts/_proto/Dockerfile
new file mode 100644
index 00000000..ead17b0f
--- /dev/null
+++ b/scripts/_proto/Dockerfile
@@ -0,0 +1,13 @@
+FROM python:3.10
+
+RUN python -m pip install --upgrade wheel "poetry==1.3.2" poethepoet
+VOLUME ["/api_new", "/bridge_new"]
+
+COPY ./ ./
+
+RUN mkdir -p ./temporalio/api
+RUN poetry install --no-root -E opentelemetry
+RUN poetry add "protobuf<4"
+RUN poe gen-protos
+
+CMD cp -r ./temporalio/api/* /api_new && cp -r ./temporalio/bridge/proto/* /bridge_new
diff --git a/scripts/_proto/Dockerfile.dockerignore b/scripts/_proto/Dockerfile.dockerignore
new file mode 100644
index 00000000..93d7c20a
--- /dev/null
+++ b/scripts/_proto/Dockerfile.dockerignore
@@ -0,0 +1,11 @@
+.git/
+.idea/
+.mypy_cache/
+.pytest_cache/
+.venv/
+build/
+dist/
+temporalio/api/
+temporalio/bridge/**/target/
+temporalio/bridge/**/*.so
+Dockerfile
\ No newline at end of file
diff --git a/temporalio/bridge/Cargo.lock b/temporalio/bridge/Cargo.lock
index 4fa15f8f..4154e028 100644
--- a/temporalio/bridge/Cargo.lock
+++ b/temporalio/bridge/Cargo.lock
@@ -30,20 +30,21 @@ dependencies = [
 
 [[package]]
 name = "ahash"
-version = "0.8.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
+checksum = "cd7d5a2cecb58716e47d67d5703a249964b14c7be1ec3cad3affc295b2d1c35d"
 dependencies = [
  "cfg-if",
  "once_cell",
  "version_check",
+ "zerocopy",
 ]
 
 [[package]]
 name = "aho-corasick"
-version = "1.0.4"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6748e8def348ed4d14996fa801f4122cd763fff530258cdc03f64b25f89d3a5a"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
 dependencies = [
  "memchr",
 ]
@@ -54,12 +55,6 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
 
-[[package]]
-name = "android-tzdata"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
-
 [[package]]
 name = "anyhow"
 version = "1.0.75"
@@ -91,18 +86,18 @@ checksum = "16e62a023e7c117e27523144c5d2459f4397fcc3cab0085af8e2224f643a0193"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
 name = "async-trait"
-version = "0.1.73"
+version = "0.1.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc00ceb34980c03614e35a3a4e218276a0a824e911d07651cd0d858a51e8c0f0"
+checksum = "a66537f1bb974b254c98ed142ff995236e81b9d0fe4db0575f46612cb15eb0f9"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -184,9 +179,9 @@ dependencies = [
 
 [[package]]
 name = "base64"
-version = "0.21.2"
+version = "0.21.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "604178f6c5c21f02dc555784810edfb88d34ac2c73b2eae109655649ee73ce3d"
+checksum = "35636a1494ede3b646cc98f74f8e62c773a38a659ebc777a2cf26b9b74171df9"
 
 [[package]]
 name = "base64ct"
@@ -202,9 +197,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bitflags"
-version = "2.4.0"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4682ae6287fcf752ecaabbfcc7b6f9b72aa33933dc23a554d853aea8eea8635"
+checksum = "327762f6e5a765692301e5bb513e0d9fef63be86bbc14528052b1cd3e6f03e07"
 
 [[package]]
 name = "block-buffer"
@@ -217,21 +212,21 @@ dependencies = [
 
 [[package]]
 name = "bumpalo"
-version = "3.13.0"
+version = "3.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
+checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
 
 [[package]]
 name = "byteorder"
-version = "1.4.3"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "bzip2"
@@ -272,11 +267,10 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.26"
+version = "0.4.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec837a71355b28f6556dbd569b37b3f363091c0bd4b2e735674521b4c5fd9bc5"
+checksum = "7f2c685bad3eb3d45a01354cedb7d5faa66194d1d58ba6e267a8de788f79db38"
 dependencies = [
- "android-tzdata",
  "num-traits",
  "serde",
 ]
@@ -321,9 +315,9 @@ checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
+checksum = "3fbc60abd742b35f2492f808e1abbb83d45f72db402e14c55057edc9c7b1e9e4"
 dependencies = [
  "libc",
 ]
@@ -451,12 +445,12 @@ dependencies = [
 
 [[package]]
 name = "dashmap"
-version = "5.5.1"
+version = "5.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "edd72493923899c6f10c641bdbdeddc7183d6396641d99c1a0d1597f37f92e28"
+checksum = "978747c1d849a7d2ee5e8adc0159961c48fb7e5db2f06af6723b80123bb53856"
 dependencies = [
  "cfg-if",
- "hashbrown 0.14.0",
+ "hashbrown 0.14.2",
  "lock_api",
  "once_cell",
  "parking_lot_core",
@@ -464,9 +458,12 @@ dependencies = [
 
 [[package]]
 name = "deranged"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2696e8a945f658fd14dc3b87242e6b80cd0f36ff04ea560fa39082368847946"
+checksum = "0f32d04922c60427da6f9fef14d042d9edddef64cb9d4ce0d64d0685fbeb1fd3"
+dependencies = [
+ "powerfmt",
+]
 
 [[package]]
 name = "derive_builder"
@@ -567,7 +564,7 @@ checksum = "eecf8589574ce9b895052fa12d69af7a233f99e6107f5cb8dd1044f2a17bfdcb"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -579,7 +576,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -590,39 +587,28 @@ checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
 [[package]]
 name = "erased-serde"
-version = "0.3.30"
+version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "837c0466252947ada828b975e12daf82e18bb5444e4df87be6038d4469e2a3d2"
+checksum = "6c138974f9d5e7fe373eb04df7cae98833802ae4b11c24ac7039a21d5af4b26c"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "errno"
-version = "0.3.2"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b30f669a7961ef1631673d2766cc92f52d64f7ef354d4fe0ddfd30ed52f0f4f"
+checksum = "ac3e13f66a2f95e32a39eaa81f6b95d42878ca0e1db0c7543723dfe12557e860"
 dependencies = [
- "errno-dragonfly",
  "libc",
  "windows-sys",
 ]
 
-[[package]]
-name = "errno-dragonfly"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
-dependencies = [
- "cc",
- "libc",
-]
-
 [[package]]
 name = "fastrand"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
+checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
 
 [[package]]
 name = "filetime"
@@ -632,7 +618,7 @@ checksum = "d4029edd3e734da6fe05b6cd7bd2960760a616bd2ddd0d59a0124746d6272af0"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.3.5",
  "windows-sys",
 ]
 
@@ -644,9 +630,9 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flate2"
-version = "1.0.27"
+version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6c98ee8095e9d1dcbf2fcc6d95acccb90d1c81db1e44725c6a984b1dbdfb010"
+checksum = "46303f565772937ffe1d394a4fac6f411c6013172fadde9dcdb1e147a086940e"
 dependencies = [
  "crc32fast",
  "miniz_oxide",
@@ -738,7 +724,7 @@ checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -860,9 +846,9 @@ checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
 [[package]]
 name = "hashbrown"
-version = "0.14.0"
+version = "0.14.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
+checksum = "f93e7192158dbcda357bdec5fb5788eebf8bbac027f3f33e719d29135ae84156"
 dependencies = [
  "ahash",
  "allocator-api2",
@@ -876,9 +862,9 @@ checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
 [[package]]
 name = "hermit-abi"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
+checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
 
 [[package]]
 name = "hmac"
@@ -889,6 +875,15 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "home"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5444c27eef6923071f7ebcc33e3444508466a76f7a2b93da00ed6e19f30c1ddb"
+dependencies = [
+ "windows-sys",
+]
+
 [[package]]
 name = "http"
 version = "0.2.9"
@@ -940,7 +935,7 @@ dependencies = [
  "httpdate",
  "itoa",
  "pin-project-lite",
- "socket2 0.4.9",
+ "socket2 0.4.10",
  "tokio",
  "tower-service",
  "tracing",
@@ -1001,12 +996,12 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.0.0"
+version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d5477fe2230a79769d8dc68e0eabf5437907c0457a5614a9e8dddb67f65eb65d"
+checksum = "8adf3ddd720272c6ea8bf59463c04e0f93d0bbf7c5439b691bca2987e0270897"
 dependencies = [
  "equivalent",
- "hashbrown 0.14.0",
+ "hashbrown 0.14.2",
 ]
 
 [[package]]
@@ -1035,15 +1030,15 @@ dependencies = [
 
 [[package]]
 name = "inventory"
-version = "0.3.11"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a53088c87cf71c9d4f3372a2cb9eea1e7b8a0b1bf8b7f7d23fe5b76dbb07e63b"
+checksum = "e1be380c410bf0595e94992a648ea89db4dd3f3354ba54af206fd2a68cf5ac8e"
 
 [[package]]
 name = "ipnet"
-version = "2.8.0"
+version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28b29a3cd74f0f4598934efe3aeba42bae0eb4680554128851ebbecb02af14e6"
+checksum = "8f518f335dce6725a761382244631d86cf0ccb2863413590b31338feb467f9c3"
 
 [[package]]
 name = "itertools"
@@ -1071,9 +1066,9 @@ checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
@@ -1095,21 +1090,21 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.149"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "a08173bc88b7955d1b3145aa561539096c421ac8debde8cbc3612ec635fee29b"
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.4.5"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57bcfdad1b858c2db7c38303a6d2ad4dfaf5eb53dfeb0910128b2c26d6158503"
+checksum = "da2479e8c062e40bf0066ffa0bc823de0a9368974af99c9f6df941d2c231e03f"
 
 [[package]]
 name = "lock_api"
-version = "0.4.10"
+version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
+checksum = "3c168f8615b12bc01f9c17e2eb0cc07dcae1940121185446edc3744920e8ef45"
 dependencies = [
  "autocfg",
  "scopeguard",
@@ -1123,11 +1118,11 @@ checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "lru"
-version = "0.11.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eedb2bdbad7e0634f83989bf596f497b070130daaa398ab22d84c39e266deec5"
+checksum = "a4a83fb7698b3643a0e34f9ae6f2e8f0178c0fd42f8b59d493aa271ff3a5bf21"
 dependencies = [
- "hashbrown 0.14.0",
+ "hashbrown 0.14.2",
 ]
 
 [[package]]
@@ -1150,15 +1145,15 @@ dependencies = [
 
 [[package]]
 name = "matchit"
-version = "0.7.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed1202b2a6f884ae56f04cff409ab315c5ce26b5e58d7412e484f01fd52f52ef"
+checksum = "0e7465ac9959cc2b1404e8e2367b43684a6d13790fe23056cc8c6c5a6b7bcb94"
 
 [[package]]
 name = "memchr"
-version = "2.5.0"
+version = "2.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
 
 [[package]]
 name = "memoffset"
@@ -1195,9 +1190,9 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.8.8"
+version = "0.8.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "927a765cd3fc26206e66b296465fa9d3e5ab003e651c1b3c060e7956d96b19d2"
+checksum = "3dce281c5e46beae905d4de1870d8b1509a9142b62eedf18b443b011ca8343d0"
 dependencies = [
  "libc",
  "wasi",
@@ -1243,7 +1238,7 @@ version = "0.27.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
 dependencies = [
- "bitflags 2.4.0",
+ "bitflags 2.4.1",
  "cfg-if",
  "libc",
 ]
@@ -1278,9 +1273,9 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.16"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
+checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
 dependencies = [
  "autocfg",
 ]
@@ -1297,9 +1292,9 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.32.0"
+version = "0.32.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77ac5bbd07aea88c60a577a1ce218075ffd59208b2d7ca97adf9bfc5aeb21ebe"
+checksum = "9cf5f9dd3933bd50a9e1f149ec995f39ae2c496d31fd772c1fd45ebc27e902b0"
 dependencies = [
  "memchr",
 ]
@@ -1420,9 +1415,9 @@ dependencies = [
 
 [[package]]
 name = "ordered-float"
-version = "3.9.1"
+version = "3.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a54938017eacd63036332b4ae5c8a49fc8c0c1d6d629893057e4f13609edd06"
+checksum = "f1e1c390732d15f1d48471625cd92d154e66db2c56645e29a9cd26f4699f72dc"
 dependencies = [
  "num-traits",
 ]
@@ -1445,13 +1440,13 @@ dependencies = [
 
 [[package]]
 name = "parking_lot_core"
-version = "0.9.8"
+version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93f00c865fe7cabf650081affecd3871070f26767e7b2070a3ffae14c654b447"
+checksum = "4c42a9226546d68acdd9c0a280d17ce19bfe27a46bf68784e4066115788d008e"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.4.1",
  "smallvec",
  "windows-targets",
 ]
@@ -1492,7 +1487,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e1d3afd2628e69da2be385eb6f2fd57c8ac7977ceeff6dc166ff1657b0e386a9"
 dependencies = [
  "fixedbitset",
- "indexmap 2.0.0",
+ "indexmap 2.0.2",
 ]
 
 [[package]]
@@ -1512,14 +1507,14 @@ checksum = "4359fd9c9171ec6e8c62926d6faaf553a8dc3f64e1507e76da7911b4f6a04405"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.12"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12cc1b0bf1727a77a54b6654e7b5f1af8604923edc8b81885f8ec92f9e3f0a05"
+checksum = "8afb450f006bf6385ca15ef45d71d2288452bc3683ce2e2cacc0d18e4be60b58"
 
 [[package]]
 name = "pin-utils"
@@ -1533,6 +1528,12 @@ version = "0.3.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -1581,9 +1582,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
 dependencies = [
  "unicode-ident",
 ]
@@ -1855,16 +1856,25 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4722d768eff46b75989dd134e5c353f0d6296e5aaa3132e776cbdb56be7731aa"
+dependencies = [
+ "bitflags 1.3.2",
+]
+
 [[package]]
 name = "regex"
-version = "1.9.3"
+version = "1.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81bc1d4caf89fac26a70747fe603c130093b53c773888797a6329091246d651a"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata 0.3.6",
- "regex-syntax 0.7.4",
+ "regex-automata 0.4.3",
+ "regex-syntax 0.8.2",
 ]
 
 [[package]]
@@ -1878,13 +1888,13 @@ dependencies = [
 
 [[package]]
 name = "regex-automata"
-version = "0.3.6"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fed1ceff11a1dddaee50c9dc8e4938bd106e9d89ae372f192311e7da498e3b69"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax 0.7.4",
+ "regex-syntax 0.8.2",
 ]
 
 [[package]]
@@ -1895,15 +1905,15 @@ checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
 
 [[package]]
 name = "regex-syntax"
-version = "0.7.4"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
 
 [[package]]
 name = "reqwest"
-version = "0.11.20"
+version = "0.11.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e9ad3fe7488d7e34558a2033d45a0c90b72d97b4f80705666fea71472e2e6a1"
+checksum = "046cd98826c46c2ac8ddecae268eb5c2e58628688a5fc7a2643704a73faba95b"
 dependencies = [
  "base64",
  "bytes",
@@ -1927,6 +1937,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_urlencoded",
+ "system-configuration",
  "tokio",
  "tokio-rustls",
  "tokio-util",
@@ -1942,17 +1953,16 @@ dependencies = [
 
 [[package]]
 name = "ring"
-version = "0.16.20"
+version = "0.17.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3053cf52e236a3ed746dfc745aa9cacf1b791d846bdaf412f60a8d7d6e17c8fc"
+checksum = "fb0205304757e5d899b9c2e448b867ffd03ae7f988002e47cd24954391394d0b"
 dependencies = [
  "cc",
+ "getrandom",
  "libc",
- "once_cell",
  "spin",
  "untrusted",
- "web-sys",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -1995,7 +2005,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustfsm_trait",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -2004,11 +2014,11 @@ version = "0.1.0"
 
 [[package]]
 name = "rustix"
-version = "0.38.8"
+version = "0.38.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19ed4fa021d81c8392ce04db050a3da9a60299050b7ae1cf482d862b54a7218f"
+checksum = "67ce50cb2e16c2903e30d1cbccfd8387a74b9d4c938b6a4c5ec6cc7556f7a8a0"
 dependencies = [
- "bitflags 2.4.0",
+ "bitflags 2.4.1",
  "errno",
  "libc",
  "linux-raw-sys",
@@ -2017,9 +2027,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.21.6"
+version = "0.21.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d1feddffcfcc0b33f5c6ce9a29e341e4cd59c3f78e7ee45f4a40c038b1d6cbb"
+checksum = "446e14c5cda4f3f30fe71863c34ec70f5ac79d6087097ad0bb433e1be5edf04c"
 dependencies = [
  "log",
  "ring",
@@ -2050,9 +2060,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.101.4"
+version = "0.101.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d93931baf2d282fff8d3a532bbfd7653f734643161b87e3e01e59a04439bf0d"
+checksum = "8b6275d1ee7a1cd780b64aca7726599a1dbc893b1e64144529e55c3c2f745765"
 dependencies = [
  "ring",
  "untrusted",
@@ -2087,9 +2097,9 @@ checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
 [[package]]
 name = "sct"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d53dcdb7c9f8158937a7981b48accfd39a43af418591a5d008c7b22b5e1b7ca4"
+checksum = "da046153aa2352493d6cb7da4b6e5c0c057d8a1d0a9aa8560baffdd945acd414"
 dependencies = [
  "ring",
  "untrusted",
@@ -2120,35 +2130,35 @@ dependencies = [
 
 [[package]]
 name = "semver"
-version = "1.0.18"
+version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+checksum = "836fa6a3e1e547f9a2c4040802ec865b5d85f4014efe00555d7090a3dcaa1090"
 
 [[package]]
 name = "serde"
-version = "1.0.186"
+version = "1.0.189"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f5db24220c009de9bd45e69fb2938f4b6d2df856aa9304ce377b3180f83b7c1"
+checksum = "8e422a44e74ad4001bdc8eede9a4570ab52f71190e9c076d14369f38b9200537"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.186"
+version = "1.0.189"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ad697f7e0b65af4983a4ce8f56ed5b357e8d3c36651bf6a7e13639c17b8e670"
+checksum = "1e48d1f918009ce3145511378cf68d613e3b3d9137d67272562080d68a2b32d5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.105"
+version = "1.0.107"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "693151e1ac27563d6dbcec9dee9fbd5da8539b20fa14ad3752b2e6d363ace360"
+checksum = "6b420ce6e3d8bd882e9b243c6eed35dbc9a6110c9769e74b584e0d68d1f20c65"
 dependencies = [
  "itoa",
  "ryu",
@@ -2169,9 +2179,9 @@ dependencies = [
 
 [[package]]
 name = "sha1"
-version = "0.10.5"
+version = "0.10.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f04293dc80c3993519f2d7f6f511707ee7094fe0c6d3406feb330cdb3540eba3"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -2180,9 +2190,9 @@ dependencies = [
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -2191,9 +2201,9 @@ dependencies = [
 
 [[package]]
 name = "sharded-slab"
-version = "0.1.4"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "900fba806f70c630b0a382d0d825e17a0f19fcd059a2ade1ff237bcddf446b31"
+checksum = "f40ca3c46823713e0d4209592e8d6e826aa57e928f09752619fc696c499637f6"
 dependencies = [
  "lazy_static",
 ]
@@ -2233,15 +2243,15 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.11.0"
+version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
+checksum = "942b4a808e05215192e39f4ab80813e599068285906cc91aa64f923db842bd5a"
 
 [[package]]
 name = "socket2"
-version = "0.4.9"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64a4a911eed85daf18834cfaa86a79b7d266ff93ff5ba14005426219480ed662"
+checksum = "9f7916fc008ca5542385b89a3d3ce689953c143e9304a9bf8beec1de48994c0d"
 dependencies = [
  "libc",
  "winapi",
@@ -2249,9 +2259,9 @@ dependencies = [
 
 [[package]]
 name = "socket2"
-version = "0.5.3"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2538b18701741680e0322a2302176d3253a35388e2e62f172f64f4f16605f877"
+checksum = "7b5fac59a5cb5dd637972e5fca70daf0523c9067fcdc4842f053dae04a18f8e9"
 dependencies = [
  "libc",
  "windows-sys",
@@ -2259,9 +2269,9 @@ dependencies = [
 
 [[package]]
 name = "spin"
-version = "0.5.2"
+version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
 
 [[package]]
 name = "strsim"
@@ -2288,9 +2298,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.29"
+version = "2.0.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
+checksum = "e96b79aaa137db8f61e26363a0c9b47d8b4ec75da28b7d1d614c2303e232408b"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2303,6 +2313,27 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2047c6ded9c721764247e62cd3b03c09ffc529b2ba5b10ec482ae507a4a70160"
 
+[[package]]
+name = "system-configuration"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba3a3adc5c275d719af8cb4272ea1c4a6d668a777f37e115f6d11ddbc1c8e0e7"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation",
+ "system-configuration-sys",
+]
+
+[[package]]
+name = "system-configuration-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75fb188eb626b924683e3b95e3a48e63551fcfb51949de2f06a9d91dbee93c9"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
 [[package]]
 name = "tar"
 version = "0.4.40"
@@ -2316,9 +2347,9 @@ dependencies = [
 
 [[package]]
 name = "target-lexicon"
-version = "0.12.11"
+version = "0.12.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d0e916b1148c8e263850e1ebcbd046f333e0683c724876bb0da63ea4373dc8a"
+checksum = "14c39fd04924ca3a864207c66fc2cd7d22d7c016007f9ce846cbb9326331930a"
 
 [[package]]
 name = "tempfile"
@@ -2328,7 +2359,7 @@ checksum = "cb94d2f3cc536af71caac6b6fcebf65860b347e7ce0cc9ebe8f70d3e521054ef"
 dependencies = [
  "cfg-if",
  "fastrand",
- "redox_syscall",
+ "redox_syscall 0.3.5",
  "rustix",
  "windows-sys",
 ]
@@ -2404,6 +2435,7 @@ dependencies = [
  "hyper",
  "itertools 0.11.0",
  "lazy_static",
+ "log",
  "lru",
  "mockall",
  "nix",
@@ -2490,22 +2522,22 @@ checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
 
 [[package]]
 name = "thiserror"
-version = "1.0.47"
+version = "1.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97a802ec30afc17eee47b2855fc72e0c4cd62be9b4efe6591edde0ec5bd68d8f"
+checksum = "f9a7210f5c9a7156bb50aa36aed4c95afb51df0df00713949448cf9e97d382d2"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.47"
+version = "1.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bb623b56e39ab7dcd4b1b98bb6c8f8d907ed255b18de254088016b27a8ee19b"
+checksum = "266b2e40bc00e5a6c09c3584011e08b06f123c00362c92b975ba9843aaaa14b8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -2520,20 +2552,21 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.27"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bb39ee79a6d8de55f48f2293a830e040392f1c5f16e336bdd1788cd0aadce07"
+checksum = "c4a34ab300f2dee6e562c10a046fc05e358b29f9bf92277f30c3c8d82275f6f5"
 dependencies = [
  "deranged",
+ "powerfmt",
  "serde",
  "time-core",
 ]
 
 [[package]]
 name = "time-core"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7300fbefb4dadc1af235a9cef3737cea692a9d97e1b9cbcd4ebdae6f8868e6fb"
+checksum = "ef927ca75afb808a4d64dd374f00a2adf8d0fcff8e7b184af886c3c87ec4a3f3"
 
 [[package]]
 name = "tinyvec"
@@ -2552,9 +2585,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.32.0"
+version = "1.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17ed6077ed6cd6c74735e21f37eb16dc3935f96878b1fe961074089cc80893f9"
+checksum = "4f38200e3ef7995e5ef13baec2f432a6da0aa9ac495b2c0e8f3b7eec2c92d653"
 dependencies = [
  "backtrace",
  "bytes",
@@ -2564,7 +2597,7 @@ dependencies = [
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
- "socket2 0.5.3",
+ "socket2 0.5.5",
  "tokio-macros",
  "windows-sys",
 ]
@@ -2587,7 +2620,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -2613,9 +2646,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.7.8"
+version = "0.7.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "806fe8c2c87eccc8b3267cbae29ed3ab2d0bd37fca70ab622e46aaa9375ddb7d"
+checksum = "1d68074620f57a0b21594d9735eb2e98ab38b17f80d3fcb189fca266771ca60d"
 dependencies = [
  "bytes",
  "futures-core",
@@ -2704,11 +2737,10 @@ checksum = "b6bc1c9ce2b5135ac7f93c72918fc37feb872bdc6a5533a8b85eb4b86bfdae52"
 
 [[package]]
 name = "tracing"
-version = "0.1.37"
+version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
+checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
- "cfg-if",
  "log",
  "pin-project-lite",
  "tracing-attributes",
@@ -2717,20 +2749,20 @@ dependencies = [
 
 [[package]]
 name = "tracing-attributes"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f4f31f56159e98206da9efd823404b79b6ef3143b4a7ab76e67b1751b25a4ab"
+checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
 name = "tracing-core"
-version = "0.1.31"
+version = "0.1.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0955b8137a1df6f1a2e9a37d8a6656291ff0297c1a97c24e0d8425fe2312f79a"
+checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
 dependencies = [
  "once_cell",
  "valuable",
@@ -2748,12 +2780,12 @@ dependencies = [
 
 [[package]]
 name = "tracing-log"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78ddad33d2d10b1ed7eb9d1f518a5674713876e97e5bb9b7345a7984fbb4f922"
+checksum = "f751112709b4e791d8ce53e32c4ed2d353565a795ce84da2285393f41557bdf2"
 dependencies = [
- "lazy_static",
  "log",
+ "once_cell",
  "tracing-core",
 ]
 
@@ -2784,9 +2816,9 @@ checksum = "3528ecfd12c466c6f163363caf2d02a71161dd5e1cc6ae7b34207ea2d42d81ed"
 
 [[package]]
 name = "typenum"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
 [[package]]
 name = "typetag"
@@ -2809,7 +2841,7 @@ checksum = "bfc13d450dc4a695200da3074dacf43d449b968baee95e341920e47f61a3b40f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -2820,9 +2852,9 @@ checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.11"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "unicode-normalization"
@@ -2841,15 +2873,15 @@ checksum = "e1766d682d402817b5ac4490b3c3002d91dfa0d22812f341609f97b08757359c"
 
 [[package]]
 name = "untrusted"
-version = "0.7.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
+checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
 [[package]]
 name = "url"
-version = "2.4.0"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50bff7831e19200a85b17131d085c25d7811bc4e186efdaf54bbd132994a88cb"
+checksum = "143b538f18257fac9cad154828a57c6bf5157e1aa604d4816b5995bf6de87ae5"
 dependencies = [
  "form_urlencoded",
  "idna",
@@ -2864,9 +2896,9 @@ checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
 
 [[package]]
 name = "uuid"
-version = "1.4.1"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79daa5ed5740825c40b389c5e50312b9c86df53fccd33f281df655642b43869d"
+checksum = "88ad59a7560b41a70d191093a945f0b87bc1deeda46fb237479708a1d6b6cdfc"
 dependencies = [
  "getrandom",
 ]
@@ -2919,7 +2951,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
  "wasm-bindgen-shared",
 ]
 
@@ -2953,7 +2985,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.38",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -2995,13 +3027,14 @@ checksum = "14247bb57be4f377dfb94c72830b8ce8fc6beac03cf4bf7b9732eadd414123fc"
 
 [[package]]
 name = "which"
-version = "4.4.0"
+version = "4.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2441c784c52b289a054b7201fc93253e288f094e2f4be9058343127c4226a269"
+checksum = "87ba24419a2078cd2b0f2ede2691b6c66d8e47836da3b6db8265ebad47afbfc7"
 dependencies = [
  "either",
- "libc",
+ "home",
  "once_cell",
+ "rustix",
 ]
 
 [[package]]
@@ -3111,6 +3144,26 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "zerocopy"
+version = "0.7.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c19fae0c8a9efc6a8281f2e623db8af1db9e57852e04cde3e754dd2dc29340f"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc56589e9ddd1f1c28d4b4b5c773ce232910a6bb67a70133d61c9e347585efe9"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.38",
+]
+
 [[package]]
 name = "zip"
 version = "0.6.6"
@@ -3152,11 +3205,10 @@ dependencies = [
 
 [[package]]
 name = "zstd-sys"
-version = "2.0.8+zstd.1.5.5"
+version = "2.0.9+zstd.1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5556e6ee25d32df2586c098bbfa278803692a20d0ab9565e049480d52707ec8c"
+checksum = "9e16efa8a874a0481a574084d34cc26fdb3b99627480f785888deb6386506656"
 dependencies = [
  "cc",
- "libc",
  "pkg-config",
 ]
diff --git a/temporalio/bridge/proto/workflow_activation/__init__.py b/temporalio/bridge/proto/workflow_activation/__init__.py
index a44f6415..ce302730 100644
--- a/temporalio/bridge/proto/workflow_activation/__init__.py
+++ b/temporalio/bridge/proto/workflow_activation/__init__.py
@@ -1,5 +1,6 @@
 from .workflow_activation_pb2 import (
     CancelWorkflow,
+    DoUpdate,
     FireTimer,
     NotifyHasPatch,
     QueryWorkflow,
@@ -21,6 +22,7 @@
 
 __all__ = [
     "CancelWorkflow",
+    "DoUpdate",
     "FireTimer",
     "NotifyHasPatch",
     "QueryWorkflow",
diff --git a/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.py b/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.py
index 92720b70..a2a141f0 100644
--- a/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.py
+++ b/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.py
@@ -25,6 +25,9 @@
 from temporalio.api.failure.v1 import (
     message_pb2 as temporal_dot_api_dot_failure_dot_v1_dot_message__pb2,
 )
+from temporalio.api.update.v1 import (
+    message_pb2 as temporal_dot_api_dot_update_dot_v1_dot_message__pb2,
+)
 from temporalio.bridge.proto.activity_result import (
     activity_result_pb2 as temporal_dot_sdk_dot_core_dot_activity__result_dot_activity__result__pb2,
 )
@@ -36,7 +39,7 @@
 )
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(
-    b'\n?temporal/sdk/core/workflow_activation/workflow_activation.proto\x12\x1b\x63oresdk.workflow_activation\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/duration.proto\x1a%temporal/api/failure/v1/message.proto\x1a$temporal/api/common/v1/message.proto\x1a$temporal/api/enums/v1/workflow.proto\x1a\x37temporal/sdk/core/activity_result/activity_result.proto\x1a\x35temporal/sdk/core/child_workflow/child_workflow.proto\x1a%temporal/sdk/core/common/common.proto"\xa4\x02\n\x12WorkflowActivation\x12\x0e\n\x06run_id\x18\x01 \x01(\t\x12-\n\ttimestamp\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x14\n\x0cis_replaying\x18\x03 \x01(\x08\x12\x16\n\x0ehistory_length\x18\x04 \x01(\r\x12@\n\x04jobs\x18\x05 \x03(\x0b\x32\x32.coresdk.workflow_activation.WorkflowActivationJob\x12 \n\x18\x61vailable_internal_flags\x18\x06 \x03(\r\x12\x1a\n\x12history_size_bytes\x18\x07 \x01(\x04\x12!\n\x19\x63ontinue_as_new_suggested\x18\x08 \x01(\x08"\xe1\x08\n\x15WorkflowActivationJob\x12\x44\n\x0estart_workflow\x18\x01 \x01(\x0b\x32*.coresdk.workflow_activation.StartWorkflowH\x00\x12<\n\nfire_timer\x18\x02 \x01(\x0b\x32&.coresdk.workflow_activation.FireTimerH\x00\x12K\n\x12update_random_seed\x18\x04 \x01(\x0b\x32-.coresdk.workflow_activation.UpdateRandomSeedH\x00\x12\x44\n\x0equery_workflow\x18\x05 \x01(\x0b\x32*.coresdk.workflow_activation.QueryWorkflowH\x00\x12\x46\n\x0f\x63\x61ncel_workflow\x18\x06 \x01(\x0b\x32+.coresdk.workflow_activation.CancelWorkflowH\x00\x12\x46\n\x0fsignal_workflow\x18\x07 \x01(\x0b\x32+.coresdk.workflow_activation.SignalWorkflowH\x00\x12H\n\x10resolve_activity\x18\x08 \x01(\x0b\x32,.coresdk.workflow_activation.ResolveActivityH\x00\x12G\n\x10notify_has_patch\x18\t \x01(\x0b\x32+.coresdk.workflow_activation.NotifyHasPatchH\x00\x12q\n&resolve_child_workflow_execution_start\x18\n \x01(\x0b\x32?.coresdk.workflow_activation.ResolveChildWorkflowExecutionStartH\x00\x12\x66\n resolve_child_workflow_execution\x18\x0b \x01(\x0b\x32:.coresdk.workflow_activation.ResolveChildWorkflowExecutionH\x00\x12\x66\n resolve_signal_external_workflow\x18\x0c \x01(\x0b\x32:.coresdk.workflow_activation.ResolveSignalExternalWorkflowH\x00\x12u\n(resolve_request_cancel_external_workflow\x18\r \x01(\x0b\x32\x41.coresdk.workflow_activation.ResolveRequestCancelExternalWorkflowH\x00\x12I\n\x11remove_from_cache\x18\x32 \x01(\x0b\x32,.coresdk.workflow_activation.RemoveFromCacheH\x00\x42\t\n\x07variant"\xd9\t\n\rStartWorkflow\x12\x15\n\rworkflow_type\x18\x01 \x01(\t\x12\x13\n\x0bworkflow_id\x18\x02 \x01(\t\x12\x32\n\targuments\x18\x03 \x03(\x0b\x32\x1f.temporal.api.common.v1.Payload\x12\x17\n\x0frandomness_seed\x18\x04 \x01(\x04\x12H\n\x07headers\x18\x05 \x03(\x0b\x32\x37.coresdk.workflow_activation.StartWorkflow.HeadersEntry\x12\x10\n\x08identity\x18\x06 \x01(\t\x12I\n\x14parent_workflow_info\x18\x07 \x01(\x0b\x32+.coresdk.common.NamespacedWorkflowExecution\x12=\n\x1aworkflow_execution_timeout\x18\x08 \x01(\x0b\x32\x19.google.protobuf.Duration\x12\x37\n\x14workflow_run_timeout\x18\t \x01(\x0b\x32\x19.google.protobuf.Duration\x12\x38\n\x15workflow_task_timeout\x18\n \x01(\x0b\x32\x19.google.protobuf.Duration\x12\'\n\x1f\x63ontinued_from_execution_run_id\x18\x0b \x01(\t\x12J\n\x13\x63ontinued_initiator\x18\x0c \x01(\x0e\x32-.temporal.api.enums.v1.ContinueAsNewInitiator\x12;\n\x11\x63ontinued_failure\x18\r \x01(\x0b\x32 .temporal.api.failure.v1.Failure\x12@\n\x16last_completion_result\x18\x0e \x01(\x0b\x32 .temporal.api.common.v1.Payloads\x12\x1e\n\x16\x66irst_execution_run_id\x18\x0f \x01(\t\x12\x39\n\x0cretry_policy\x18\x10 \x01(\x0b\x32#.temporal.api.common.v1.RetryPolicy\x12\x0f\n\x07\x61ttempt\x18\x11 \x01(\x05\x12\x15\n\rcron_schedule\x18\x12 \x01(\t\x12\x46\n"workflow_execution_expiration_time\x18\x13 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x45\n"cron_schedule_to_schedule_interval\x18\x14 \x01(\x0b\x32\x19.google.protobuf.Duration\x12*\n\x04memo\x18\x15 \x01(\x0b\x32\x1c.temporal.api.common.v1.Memo\x12\x43\n\x11search_attributes\x18\x16 \x01(\x0b\x32(.temporal.api.common.v1.SearchAttributes\x12.\n\nstart_time\x18\x17 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x1aO\n\x0cHeadersEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12.\n\x05value\x18\x02 \x01(\x0b\x32\x1f.temporal.api.common.v1.Payload:\x02\x38\x01"\x18\n\tFireTimer\x12\x0b\n\x03seq\x18\x01 \x01(\r"[\n\x0fResolveActivity\x12\x0b\n\x03seq\x18\x01 \x01(\r\x12;\n\x06result\x18\x02 \x01(\x0b\x32+.coresdk.activity_result.ActivityResolution"\xd1\x02\n"ResolveChildWorkflowExecutionStart\x12\x0b\n\x03seq\x18\x01 \x01(\r\x12[\n\tsucceeded\x18\x02 \x01(\x0b\x32\x46.coresdk.workflow_activation.ResolveChildWorkflowExecutionStartSuccessH\x00\x12X\n\x06\x66\x61iled\x18\x03 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\x01(\t\x12\x12\n\nquery_type\x18\x02 \x01(\t\x12\x32\n\targuments\x18\x03 \x03(\x0b\x32\x1f.temporal.api.common.v1.Payload\x12H\n\x07headers\x18\x05 \x03(\x0b\x32\x37.coresdk.workflow_activation.QueryWorkflow.HeadersEntry\x1aO\n\x0cHeadersEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12.\n\x05value\x18\x02 \x01(\x0b\x32\x1f.temporal.api.common.v1.Payload:\x02\x38\x01"B\n\x0e\x43\x61ncelWorkflow\x12\x30\n\x07\x64\x65tails\x18\x01 \x03(\x0b\x32\x1f.temporal.api.common.v1.Payload"\x83\x02\n\x0eSignalWorkflow\x12\x13\n\x0bsignal_name\x18\x01 \x01(\t\x12.\n\x05input\x18\x02 \x03(\x0b\x32\x1f.temporal.api.common.v1.Payload\x12\x10\n\x08identity\x18\x03 \x01(\t\x12I\n\x07headers\x18\x05 \x03(\x0b\x32\x38.coresdk.workflow_activation.SignalWorkflow.HeadersEntry\x1aO\n\x0cHeadersEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12.\n\x05value\x18\x02 \x01(\x0b\x32\x1f.temporal.api.common.v1.Payload:\x02\x38\x01""\n\x0eNotifyHasPatch\x12\x10\n\x08patch_id\x18\x01 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+    b'\n?temporal/sdk/core/workflow_activation/workflow_activation.proto\x12\x1b\x63oresdk.workflow_activation\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/duration.proto\x1a%temporal/api/failure/v1/message.proto\x1a$temporal/api/update/v1/message.proto\x1a$temporal/api/common/v1/message.proto\x1a$temporal/api/enums/v1/workflow.proto\x1a\x37temporal/sdk/core/activity_result/activity_result.proto\x1a\x35temporal/sdk/core/child_workflow/child_workflow.proto\x1a%temporal/sdk/core/common/common.proto"\xa4\x02\n\x12WorkflowActivation\x12\x0e\n\x06run_id\x18\x01 \x01(\t\x12-\n\ttimestamp\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x14\n\x0cis_replaying\x18\x03 \x01(\x08\x12\x16\n\x0ehistory_length\x18\x04 \x01(\r\x12@\n\x04jobs\x18\x05 \x03(\x0b\x32\x32.coresdk.workflow_activation.WorkflowActivationJob\x12 \n\x18\x61vailable_internal_flags\x18\x06 \x03(\r\x12\x1a\n\x12history_size_bytes\x18\x07 \x01(\x04\x12!\n\x19\x63ontinue_as_new_suggested\x18\x08 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 )
 
 
@@ -74,6 +77,8 @@
 _RESOLVEREQUESTCANCELEXTERNALWORKFLOW = DESCRIPTOR.message_types_by_name[
     "ResolveRequestCancelExternalWorkflow"
 ]
+_DOUPDATE = DESCRIPTOR.message_types_by_name["DoUpdate"]
+_DOUPDATE_HEADERSENTRY = _DOUPDATE.nested_types_by_name["HeadersEntry"]
 _REMOVEFROMCACHE = DESCRIPTOR.message_types_by_name["RemoveFromCache"]
 _REMOVEFROMCACHE_EVICTIONREASON = _REMOVEFROMCACHE.enum_types_by_name["EvictionReason"]
 WorkflowActivation = _reflection.GeneratedProtocolMessageType(
@@ -293,6 +298,27 @@
 )
 _sym_db.RegisterMessage(ResolveRequestCancelExternalWorkflow)
 
+DoUpdate = _reflection.GeneratedProtocolMessageType(
+    "DoUpdate",
+    (_message.Message,),
+    {
+        "HeadersEntry": _reflection.GeneratedProtocolMessageType(
+            "HeadersEntry",
+            (_message.Message,),
+            {
+                "DESCRIPTOR": _DOUPDATE_HEADERSENTRY,
+                "__module__": "temporal.sdk.core.workflow_activation.workflow_activation_pb2"
+                # @@protoc_insertion_point(class_scope:coresdk.workflow_activation.DoUpdate.HeadersEntry)
+            },
+        ),
+        "DESCRIPTOR": _DOUPDATE,
+        "__module__": "temporal.sdk.core.workflow_activation.workflow_activation_pb2"
+        # @@protoc_insertion_point(class_scope:coresdk.workflow_activation.DoUpdate)
+    },
+)
+_sym_db.RegisterMessage(DoUpdate)
+_sym_db.RegisterMessage(DoUpdate.HeadersEntry)
+
 RemoveFromCache = _reflection.GeneratedProtocolMessageType(
     "RemoveFromCache",
     (_message.Message,),
@@ -315,48 +341,54 @@
     _QUERYWORKFLOW_HEADERSENTRY._serialized_options = b"8\001"
     _SIGNALWORKFLOW_HEADERSENTRY._options = None
     _SIGNALWORKFLOW_HEADERSENTRY._serialized_options = b"8\001"
-    _WORKFLOWACTIVATION._serialized_start = 428
-    _WORKFLOWACTIVATION._serialized_end = 720
-    _WORKFLOWACTIVATIONJOB._serialized_start = 723
-    _WORKFLOWACTIVATIONJOB._serialized_end = 1844
-    _STARTWORKFLOW._serialized_start = 1847
-    _STARTWORKFLOW._serialized_end = 3088
-    _STARTWORKFLOW_HEADERSENTRY._serialized_start = 3009
-    _STARTWORKFLOW_HEADERSENTRY._serialized_end = 3088
-    _FIRETIMER._serialized_start = 3090
-    _FIRETIMER._serialized_end = 3114
-    _RESOLVEACTIVITY._serialized_start = 3116
-    _RESOLVEACTIVITY._serialized_end = 3207
-    _RESOLVECHILDWORKFLOWEXECUTIONSTART._serialized_start = 3210
-    _RESOLVECHILDWORKFLOWEXECUTIONSTART._serialized_end = 3547
-    _RESOLVECHILDWORKFLOWEXECUTIONSTARTSUCCESS._serialized_start = 3549
-    _RESOLVECHILDWORKFLOWEXECUTIONSTARTSUCCESS._serialized_end = 3608
-    _RESOLVECHILDWORKFLOWEXECUTIONSTARTFAILURE._serialized_start = 3611
-    _RESOLVECHILDWORKFLOWEXECUTIONSTARTFAILURE._serialized_end = 3777
-    _RESOLVECHILDWORKFLOWEXECUTIONSTARTCANCELLED._serialized_start = 3779
-    _RESOLVECHILDWORKFLOWEXECUTIONSTARTCANCELLED._serialized_end = 3875
-    _RESOLVECHILDWORKFLOWEXECUTION._serialized_start = 3877
-    _RESOLVECHILDWORKFLOWEXECUTION._serialized_end = 3982
-    _UPDATERANDOMSEED._serialized_start = 3984
-    _UPDATERANDOMSEED._serialized_end = 4027
-    _QUERYWORKFLOW._serialized_start = 4030
-    _QUERYWORKFLOW._serialized_end = 4290
-    _QUERYWORKFLOW_HEADERSENTRY._serialized_start = 3009
-    _QUERYWORKFLOW_HEADERSENTRY._serialized_end = 3088
-    _CANCELWORKFLOW._serialized_start = 4292
-    _CANCELWORKFLOW._serialized_end = 4358
-    _SIGNALWORKFLOW._serialized_start = 4361
-    _SIGNALWORKFLOW._serialized_end = 4620
-    _SIGNALWORKFLOW_HEADERSENTRY._serialized_start = 3009
-    _SIGNALWORKFLOW_HEADERSENTRY._serialized_end = 3088
-    _NOTIFYHASPATCH._serialized_start = 4622
-    _NOTIFYHASPATCH._serialized_end = 4656
-    _RESOLVESIGNALEXTERNALWORKFLOW._serialized_start = 4658
-    _RESOLVESIGNALEXTERNALWORKFLOW._serialized_end = 4753
-    _RESOLVEREQUESTCANCELEXTERNALWORKFLOW._serialized_start = 4755
-    _RESOLVEREQUESTCANCELEXTERNALWORKFLOW._serialized_end = 4857
-    _REMOVEFROMCACHE._serialized_start = 4860
-    _REMOVEFROMCACHE._serialized_end = 5181
-    _REMOVEFROMCACHE_EVICTIONREASON._serialized_start = 4974
-    _REMOVEFROMCACHE_EVICTIONREASON._serialized_end = 5181
+    _DOUPDATE_HEADERSENTRY._options = None
+    _DOUPDATE_HEADERSENTRY._serialized_options = b"8\001"
+    _WORKFLOWACTIVATION._serialized_start = 466
+    _WORKFLOWACTIVATION._serialized_end = 758
+    _WORKFLOWACTIVATIONJOB._serialized_start = 761
+    _WORKFLOWACTIVATIONJOB._serialized_end = 1942
+    _STARTWORKFLOW._serialized_start = 1945
+    _STARTWORKFLOW._serialized_end = 3186
+    _STARTWORKFLOW_HEADERSENTRY._serialized_start = 3107
+    _STARTWORKFLOW_HEADERSENTRY._serialized_end = 3186
+    _FIRETIMER._serialized_start = 3188
+    _FIRETIMER._serialized_end = 3212
+    _RESOLVEACTIVITY._serialized_start = 3214
+    _RESOLVEACTIVITY._serialized_end = 3305
+    _RESOLVECHILDWORKFLOWEXECUTIONSTART._serialized_start = 3308
+    _RESOLVECHILDWORKFLOWEXECUTIONSTART._serialized_end = 3645
+    _RESOLVECHILDWORKFLOWEXECUTIONSTARTSUCCESS._serialized_start = 3647
+    _RESOLVECHILDWORKFLOWEXECUTIONSTARTSUCCESS._serialized_end = 3706
+    _RESOLVECHILDWORKFLOWEXECUTIONSTARTFAILURE._serialized_start = 3709
+    _RESOLVECHILDWORKFLOWEXECUTIONSTARTFAILURE._serialized_end = 3875
+    _RESOLVECHILDWORKFLOWEXECUTIONSTARTCANCELLED._serialized_start = 3877
+    _RESOLVECHILDWORKFLOWEXECUTIONSTARTCANCELLED._serialized_end = 3973
+    _RESOLVECHILDWORKFLOWEXECUTION._serialized_start = 3975
+    _RESOLVECHILDWORKFLOWEXECUTION._serialized_end = 4080
+    _UPDATERANDOMSEED._serialized_start = 4082
+    _UPDATERANDOMSEED._serialized_end = 4125
+    _QUERYWORKFLOW._serialized_start = 4128
+    _QUERYWORKFLOW._serialized_end = 4388
+    _QUERYWORKFLOW_HEADERSENTRY._serialized_start = 3107
+    _QUERYWORKFLOW_HEADERSENTRY._serialized_end = 3186
+    _CANCELWORKFLOW._serialized_start = 4390
+    _CANCELWORKFLOW._serialized_end = 4456
+    _SIGNALWORKFLOW._serialized_start = 4459
+    _SIGNALWORKFLOW._serialized_end = 4718
+    _SIGNALWORKFLOW_HEADERSENTRY._serialized_start = 3107
+    _SIGNALWORKFLOW_HEADERSENTRY._serialized_end = 3186
+    _NOTIFYHASPATCH._serialized_start = 4720
+    _NOTIFYHASPATCH._serialized_end = 4754
+    _RESOLVESIGNALEXTERNALWORKFLOW._serialized_start = 4756
+    _RESOLVESIGNALEXTERNALWORKFLOW._serialized_end = 4851
+    _RESOLVEREQUESTCANCELEXTERNALWORKFLOW._serialized_start = 4853
+    _RESOLVEREQUESTCANCELEXTERNALWORKFLOW._serialized_end = 4955
+    _DOUPDATE._serialized_start = 4958
+    _DOUPDATE._serialized_end = 5289
+    _DOUPDATE_HEADERSENTRY._serialized_start = 3107
+    _DOUPDATE_HEADERSENTRY._serialized_end = 3186
+    _REMOVEFROMCACHE._serialized_start = 5292
+    _REMOVEFROMCACHE._serialized_end = 5613
+    _REMOVEFROMCACHE_EVICTIONREASON._serialized_start = 5406
+    _REMOVEFROMCACHE_EVICTIONREASON._serialized_end = 5613
 # @@protoc_insertion_point(module_scope)
diff --git a/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.pyi b/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.pyi
index 557fe9f3..1be4a31a 100644
--- a/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.pyi
+++ b/temporalio/bridge/proto/workflow_activation/workflow_activation_pb2.pyi
@@ -17,6 +17,7 @@ import sys
 import temporalio.api.common.v1.message_pb2
 import temporalio.api.enums.v1.workflow_pb2
 import temporalio.api.failure.v1.message_pb2
+import temporalio.api.update.v1.message_pb2
 import temporalio.bridge.proto.activity_result.activity_result_pb2
 import temporalio.bridge.proto.child_workflow.child_workflow_pb2
 import temporalio.bridge.proto.common.common_pb2
@@ -130,6 +131,7 @@ class WorkflowActivationJob(google.protobuf.message.Message):
     RESOLVE_CHILD_WORKFLOW_EXECUTION_FIELD_NUMBER: builtins.int
     RESOLVE_SIGNAL_EXTERNAL_WORKFLOW_FIELD_NUMBER: builtins.int
     RESOLVE_REQUEST_CANCEL_EXTERNAL_WORKFLOW_FIELD_NUMBER: builtins.int
+    DO_UPDATE_FIELD_NUMBER: builtins.int
     REMOVE_FROM_CACHE_FIELD_NUMBER: builtins.int
     @property
     def start_workflow(self) -> global___StartWorkflow:
@@ -179,6 +181,9 @@ class WorkflowActivationJob(google.protobuf.message.Message):
     ) -> global___ResolveRequestCancelExternalWorkflow:
         """An attempt to cancel an external workflow resolved"""
     @property
+    def do_update(self) -> global___DoUpdate:
+        """A request to handle a workflow update."""
+    @property
     def remove_from_cache(self) -> global___RemoveFromCache:
         """Remove the workflow identified by the [WorkflowActivation] containing this job from the cache
         after performing the activation.
@@ -205,6 +210,7 @@ class WorkflowActivationJob(google.protobuf.message.Message):
         | None = ...,
         resolve_request_cancel_external_workflow: global___ResolveRequestCancelExternalWorkflow
         | None = ...,
+        do_update: global___DoUpdate | None = ...,
         remove_from_cache: global___RemoveFromCache | None = ...,
     ) -> None: ...
     def HasField(
@@ -212,6 +218,8 @@ class WorkflowActivationJob(google.protobuf.message.Message):
         field_name: typing_extensions.Literal[
             "cancel_workflow",
             b"cancel_workflow",
+            "do_update",
+            b"do_update",
             "fire_timer",
             b"fire_timer",
             "notify_has_patch",
@@ -245,6 +253,8 @@ class WorkflowActivationJob(google.protobuf.message.Message):
         field_name: typing_extensions.Literal[
             "cancel_workflow",
             b"cancel_workflow",
+            "do_update",
+            b"do_update",
             "fire_timer",
             b"fire_timer",
             "notify_has_patch",
@@ -289,6 +299,7 @@ class WorkflowActivationJob(google.protobuf.message.Message):
             "resolve_child_workflow_execution",
             "resolve_signal_external_workflow",
             "resolve_request_cancel_external_workflow",
+            "do_update",
             "remove_from_cache",
         ]
         | None
@@ -1056,6 +1067,114 @@ class ResolveRequestCancelExternalWorkflow(google.protobuf.message.Message):
 
 global___ResolveRequestCancelExternalWorkflow = ResolveRequestCancelExternalWorkflow
 
+class DoUpdate(google.protobuf.message.Message):
+    """Lang is requested to invoke an update handler on the workflow. Lang should invoke the update
+    validator first (if requested). If it accepts the update, immediately invoke the update handler.
+    Lang must reply to the activation containing this job with an `UpdateResponse`.
+    """
+
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    class HeadersEntry(google.protobuf.message.Message):
+        DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+        KEY_FIELD_NUMBER: builtins.int
+        VALUE_FIELD_NUMBER: builtins.int
+        key: builtins.str
+        @property
+        def value(self) -> temporalio.api.common.v1.message_pb2.Payload: ...
+        def __init__(
+            self,
+            *,
+            key: builtins.str = ...,
+            value: temporalio.api.common.v1.message_pb2.Payload | None = ...,
+        ) -> None: ...
+        def HasField(
+            self, field_name: typing_extensions.Literal["value", b"value"]
+        ) -> builtins.bool: ...
+        def ClearField(
+            self,
+            field_name: typing_extensions.Literal["key", b"key", "value", b"value"],
+        ) -> None: ...
+
+    ID_FIELD_NUMBER: builtins.int
+    PROTOCOL_INSTANCE_ID_FIELD_NUMBER: builtins.int
+    NAME_FIELD_NUMBER: builtins.int
+    INPUT_FIELD_NUMBER: builtins.int
+    HEADERS_FIELD_NUMBER: builtins.int
+    META_FIELD_NUMBER: builtins.int
+    RUN_VALIDATOR_FIELD_NUMBER: builtins.int
+    id: builtins.str
+    """A workflow-unique identifier for this update"""
+    protocol_instance_id: builtins.str
+    """The protocol message instance ID - this is used to uniquely track the ID server side and
+    internally.
+    """
+    name: builtins.str
+    """The name of the update handler"""
+    @property
+    def input(
+        self,
+    ) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[
+        temporalio.api.common.v1.message_pb2.Payload
+    ]:
+        """The input to the update"""
+    @property
+    def headers(
+        self,
+    ) -> google.protobuf.internal.containers.MessageMap[
+        builtins.str, temporalio.api.common.v1.message_pb2.Payload
+    ]:
+        """Headers attached to the update"""
+    @property
+    def meta(self) -> temporalio.api.update.v1.message_pb2.Meta:
+        """Remaining metadata associated with the update. The `update_id` field is stripped from here
+        and moved to `id`, since it is guaranteed to be present.
+        """
+    run_validator: builtins.bool
+    """If set true, lang must run the update's validator before running the handler. This will be
+    set false during replay, since validation is not re-run during replay.
+    """
+    def __init__(
+        self,
+        *,
+        id: builtins.str = ...,
+        protocol_instance_id: builtins.str = ...,
+        name: builtins.str = ...,
+        input: collections.abc.Iterable[temporalio.api.common.v1.message_pb2.Payload]
+        | None = ...,
+        headers: collections.abc.Mapping[
+            builtins.str, temporalio.api.common.v1.message_pb2.Payload
+        ]
+        | None = ...,
+        meta: temporalio.api.update.v1.message_pb2.Meta | None = ...,
+        run_validator: builtins.bool = ...,
+    ) -> None: ...
+    def HasField(
+        self, field_name: typing_extensions.Literal["meta", b"meta"]
+    ) -> builtins.bool: ...
+    def ClearField(
+        self,
+        field_name: typing_extensions.Literal[
+            "headers",
+            b"headers",
+            "id",
+            b"id",
+            "input",
+            b"input",
+            "meta",
+            b"meta",
+            "name",
+            b"name",
+            "protocol_instance_id",
+            b"protocol_instance_id",
+            "run_validator",
+            b"run_validator",
+        ],
+    ) -> None: ...
+
+global___DoUpdate = DoUpdate
+
 class RemoveFromCache(google.protobuf.message.Message):
     DESCRIPTOR: google.protobuf.descriptor.Descriptor
 
diff --git a/temporalio/bridge/proto/workflow_commands/__init__.py b/temporalio/bridge/proto/workflow_commands/__init__.py
index 2007a970..00008983 100644
--- a/temporalio/bridge/proto/workflow_commands/__init__.py
+++ b/temporalio/bridge/proto/workflow_commands/__init__.py
@@ -19,6 +19,7 @@
     SignalExternalWorkflowExecution,
     StartChildWorkflowExecution,
     StartTimer,
+    UpdateResponse,
     UpsertWorkflowSearchAttributes,
     WorkflowCommand,
 )
@@ -44,6 +45,7 @@
     "SignalExternalWorkflowExecution",
     "StartChildWorkflowExecution",
     "StartTimer",
+    "UpdateResponse",
     "UpsertWorkflowSearchAttributes",
     "WorkflowCommand",
 ]
diff --git a/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.py b/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.py
index b2ecd469..a22b58c9 100644
--- a/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.py
+++ b/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.py
@@ -15,6 +15,7 @@
 
 
 from google.protobuf import duration_pb2 as google_dot_protobuf_dot_duration__pb2
+from google.protobuf import empty_pb2 as google_dot_protobuf_dot_empty__pb2
 from google.protobuf import timestamp_pb2 as google_dot_protobuf_dot_timestamp__pb2
 
 from temporalio.api.common.v1 import (
@@ -34,7 +35,7 @@
 )
 
 DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(
-    b'\n;temporal/sdk/core/workflow_commands/workflow_commands.proto\x12\x19\x63oresdk.workflow_commands\x1a\x1egoogle/protobuf/duration.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a$temporal/api/common/v1/message.proto\x1a$temporal/api/enums/v1/workflow.proto\x1a%temporal/api/failure/v1/message.proto\x1a\x35temporal/sdk/core/child_workflow/child_workflow.proto\x1a%temporal/sdk/core/common/common.proto"\xac\r\n\x0fWorkflowCommand\x12<\n\x0bstart_timer\x18\x01 \x01(\x0b\x32%.coresdk.workflow_commands.StartTimerH\x00\x12H\n\x11schedule_activity\x18\x02 \x01(\x0b\x32+.coresdk.workflow_commands.ScheduleActivityH\x00\x12\x42\n\x10respond_to_query\x18\x03 \x01(\x0b\x32&.coresdk.workflow_commands.QueryResultH\x00\x12S\n\x17request_cancel_activity\x18\x04 \x01(\x0b\x32\x30.coresdk.workflow_commands.RequestCancelActivityH\x00\x12>\n\x0c\x63\x61ncel_timer\x18\x05 \x01(\x0b\x32&.coresdk.workflow_commands.CancelTimerH\x00\x12[\n\x1b\x63omplete_workflow_execution\x18\x06 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 )
 
 _ACTIVITYCANCELLATIONTYPE = DESCRIPTOR.enum_types_by_name["ActivityCancellationType"]
@@ -109,6 +110,7 @@
     _UPSERTWORKFLOWSEARCHATTRIBUTES.nested_types_by_name["SearchAttributesEntry"]
 )
 _MODIFYWORKFLOWPROPERTIES = DESCRIPTOR.message_types_by_name["ModifyWorkflowProperties"]
+_UPDATERESPONSE = DESCRIPTOR.message_types_by_name["UpdateResponse"]
 WorkflowCommand = _reflection.GeneratedProtocolMessageType(
     "WorkflowCommand",
     (_message.Message,),
@@ -440,6 +442,17 @@
 )
 _sym_db.RegisterMessage(ModifyWorkflowProperties)
 
+UpdateResponse = _reflection.GeneratedProtocolMessageType(
+    "UpdateResponse",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _UPDATERESPONSE,
+        "__module__": "temporal.sdk.core.workflow_commands.workflow_commands_pb2"
+        # @@protoc_insertion_point(class_scope:coresdk.workflow_commands.UpdateResponse)
+    },
+)
+_sym_db.RegisterMessage(UpdateResponse)
+
 if _descriptor._USE_C_DESCRIPTORS == False:
     DESCRIPTOR._options = None
     DESCRIPTOR._serialized_options = (
@@ -465,68 +478,70 @@
     _SIGNALEXTERNALWORKFLOWEXECUTION_HEADERSENTRY._serialized_options = b"8\001"
     _UPSERTWORKFLOWSEARCHATTRIBUTES_SEARCHATTRIBUTESENTRY._options = None
     _UPSERTWORKFLOWSEARCHATTRIBUTES_SEARCHATTRIBUTESENTRY._serialized_options = b"8\001"
-    _ACTIVITYCANCELLATIONTYPE._serialized_start = 7388
-    _ACTIVITYCANCELLATIONTYPE._serialized_end = 7476
-    _WORKFLOWCOMMAND._serialized_start = 365
-    _WORKFLOWCOMMAND._serialized_end = 2073
-    _STARTTIMER._serialized_start = 2075
-    _STARTTIMER._serialized_end = 2158
-    _CANCELTIMER._serialized_start = 2160
-    _CANCELTIMER._serialized_end = 2186
-    _SCHEDULEACTIVITY._serialized_start = 2189
-    _SCHEDULEACTIVITY._serialized_end = 2961
-    _SCHEDULEACTIVITY_HEADERSENTRY._serialized_start = 2882
-    _SCHEDULEACTIVITY_HEADERSENTRY._serialized_end = 2961
-    _SCHEDULELOCALACTIVITY._serialized_start = 2964
-    _SCHEDULELOCALACTIVITY._serialized_end = 3714
-    _SCHEDULELOCALACTIVITY_HEADERSENTRY._serialized_start = 2882
-    _SCHEDULELOCALACTIVITY_HEADERSENTRY._serialized_end = 2961
-    _REQUESTCANCELACTIVITY._serialized_start = 3716
-    _REQUESTCANCELACTIVITY._serialized_end = 3752
-    _REQUESTCANCELLOCALACTIVITY._serialized_start = 3754
-    _REQUESTCANCELLOCALACTIVITY._serialized_end = 3795
-    _QUERYRESULT._serialized_start = 3798
-    _QUERYRESULT._serialized_end = 3954
-    _QUERYSUCCESS._serialized_start = 3956
-    _QUERYSUCCESS._serialized_end = 4021
-    _COMPLETEWORKFLOWEXECUTION._serialized_start = 4023
-    _COMPLETEWORKFLOWEXECUTION._serialized_end = 4099
-    _FAILWORKFLOWEXECUTION._serialized_start = 4101
-    _FAILWORKFLOWEXECUTION._serialized_end = 4175
-    _CONTINUEASNEWWORKFLOWEXECUTION._serialized_start = 4178
-    _CONTINUEASNEWWORKFLOWEXECUTION._serialized_end = 5069
-    _CONTINUEASNEWWORKFLOWEXECUTION_MEMOENTRY._serialized_start = 4822
-    _CONTINUEASNEWWORKFLOWEXECUTION_MEMOENTRY._serialized_end = 4898
-    _CONTINUEASNEWWORKFLOWEXECUTION_HEADERSENTRY._serialized_start = 2882
-    _CONTINUEASNEWWORKFLOWEXECUTION_HEADERSENTRY._serialized_end = 2961
-    _CONTINUEASNEWWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_start = 4981
-    _CONTINUEASNEWWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_end = 5069
-    _CANCELWORKFLOWEXECUTION._serialized_start = 5071
-    _CANCELWORKFLOWEXECUTION._serialized_end = 5096
-    _SETPATCHMARKER._serialized_start = 5098
-    _SETPATCHMARKER._serialized_end = 5152
-    _STARTCHILDWORKFLOWEXECUTION._serialized_start = 5155
-    _STARTCHILDWORKFLOWEXECUTION._serialized_end = 6403
-    _STARTCHILDWORKFLOWEXECUTION_HEADERSENTRY._serialized_start = 2882
-    _STARTCHILDWORKFLOWEXECUTION_HEADERSENTRY._serialized_end = 2961
-    _STARTCHILDWORKFLOWEXECUTION_MEMOENTRY._serialized_start = 4822
-    _STARTCHILDWORKFLOWEXECUTION_MEMOENTRY._serialized_end = 4898
-    _STARTCHILDWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_start = 4981
-    _STARTCHILDWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_end = 5069
-    _CANCELCHILDWORKFLOWEXECUTION._serialized_start = 6405
-    _CANCELCHILDWORKFLOWEXECUTION._serialized_end = 6463
-    _REQUESTCANCELEXTERNALWORKFLOWEXECUTION._serialized_start = 6466
-    _REQUESTCANCELEXTERNALWORKFLOWEXECUTION._serialized_end = 6633
-    _SIGNALEXTERNALWORKFLOWEXECUTION._serialized_start = 6636
-    _SIGNALEXTERNALWORKFLOWEXECUTION._serialized_end = 7035
-    _SIGNALEXTERNALWORKFLOWEXECUTION_HEADERSENTRY._serialized_start = 2882
-    _SIGNALEXTERNALWORKFLOWEXECUTION_HEADERSENTRY._serialized_end = 2961
-    _CANCELSIGNALWORKFLOW._serialized_start = 7037
-    _CANCELSIGNALWORKFLOW._serialized_end = 7072
-    _UPSERTWORKFLOWSEARCHATTRIBUTES._serialized_start = 7075
-    _UPSERTWORKFLOWSEARCHATTRIBUTES._serialized_end = 7305
-    _UPSERTWORKFLOWSEARCHATTRIBUTES_SEARCHATTRIBUTESENTRY._serialized_start = 4981
-    _UPSERTWORKFLOWSEARCHATTRIBUTES_SEARCHATTRIBUTESENTRY._serialized_end = 5069
-    _MODIFYWORKFLOWPROPERTIES._serialized_start = 7307
-    _MODIFYWORKFLOWPROPERTIES._serialized_end = 7386
+    _ACTIVITYCANCELLATIONTYPE._serialized_start = 7700
+    _ACTIVITYCANCELLATIONTYPE._serialized_end = 7788
+    _WORKFLOWCOMMAND._serialized_start = 394
+    _WORKFLOWCOMMAND._serialized_end = 2172
+    _STARTTIMER._serialized_start = 2174
+    _STARTTIMER._serialized_end = 2257
+    _CANCELTIMER._serialized_start = 2259
+    _CANCELTIMER._serialized_end = 2285
+    _SCHEDULEACTIVITY._serialized_start = 2288
+    _SCHEDULEACTIVITY._serialized_end = 3060
+    _SCHEDULEACTIVITY_HEADERSENTRY._serialized_start = 2981
+    _SCHEDULEACTIVITY_HEADERSENTRY._serialized_end = 3060
+    _SCHEDULELOCALACTIVITY._serialized_start = 3063
+    _SCHEDULELOCALACTIVITY._serialized_end = 3813
+    _SCHEDULELOCALACTIVITY_HEADERSENTRY._serialized_start = 2981
+    _SCHEDULELOCALACTIVITY_HEADERSENTRY._serialized_end = 3060
+    _REQUESTCANCELACTIVITY._serialized_start = 3815
+    _REQUESTCANCELACTIVITY._serialized_end = 3851
+    _REQUESTCANCELLOCALACTIVITY._serialized_start = 3853
+    _REQUESTCANCELLOCALACTIVITY._serialized_end = 3894
+    _QUERYRESULT._serialized_start = 3897
+    _QUERYRESULT._serialized_end = 4053
+    _QUERYSUCCESS._serialized_start = 4055
+    _QUERYSUCCESS._serialized_end = 4120
+    _COMPLETEWORKFLOWEXECUTION._serialized_start = 4122
+    _COMPLETEWORKFLOWEXECUTION._serialized_end = 4198
+    _FAILWORKFLOWEXECUTION._serialized_start = 4200
+    _FAILWORKFLOWEXECUTION._serialized_end = 4274
+    _CONTINUEASNEWWORKFLOWEXECUTION._serialized_start = 4277
+    _CONTINUEASNEWWORKFLOWEXECUTION._serialized_end = 5168
+    _CONTINUEASNEWWORKFLOWEXECUTION_MEMOENTRY._serialized_start = 4921
+    _CONTINUEASNEWWORKFLOWEXECUTION_MEMOENTRY._serialized_end = 4997
+    _CONTINUEASNEWWORKFLOWEXECUTION_HEADERSENTRY._serialized_start = 2981
+    _CONTINUEASNEWWORKFLOWEXECUTION_HEADERSENTRY._serialized_end = 3060
+    _CONTINUEASNEWWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_start = 5080
+    _CONTINUEASNEWWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_end = 5168
+    _CANCELWORKFLOWEXECUTION._serialized_start = 5170
+    _CANCELWORKFLOWEXECUTION._serialized_end = 5195
+    _SETPATCHMARKER._serialized_start = 5197
+    _SETPATCHMARKER._serialized_end = 5251
+    _STARTCHILDWORKFLOWEXECUTION._serialized_start = 5254
+    _STARTCHILDWORKFLOWEXECUTION._serialized_end = 6502
+    _STARTCHILDWORKFLOWEXECUTION_HEADERSENTRY._serialized_start = 2981
+    _STARTCHILDWORKFLOWEXECUTION_HEADERSENTRY._serialized_end = 3060
+    _STARTCHILDWORKFLOWEXECUTION_MEMOENTRY._serialized_start = 4921
+    _STARTCHILDWORKFLOWEXECUTION_MEMOENTRY._serialized_end = 4997
+    _STARTCHILDWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_start = 5080
+    _STARTCHILDWORKFLOWEXECUTION_SEARCHATTRIBUTESENTRY._serialized_end = 5168
+    _CANCELCHILDWORKFLOWEXECUTION._serialized_start = 6504
+    _CANCELCHILDWORKFLOWEXECUTION._serialized_end = 6562
+    _REQUESTCANCELEXTERNALWORKFLOWEXECUTION._serialized_start = 6565
+    _REQUESTCANCELEXTERNALWORKFLOWEXECUTION._serialized_end = 6732
+    _SIGNALEXTERNALWORKFLOWEXECUTION._serialized_start = 6735
+    _SIGNALEXTERNALWORKFLOWEXECUTION._serialized_end = 7134
+    _SIGNALEXTERNALWORKFLOWEXECUTION_HEADERSENTRY._serialized_start = 2981
+    _SIGNALEXTERNALWORKFLOWEXECUTION_HEADERSENTRY._serialized_end = 3060
+    _CANCELSIGNALWORKFLOW._serialized_start = 7136
+    _CANCELSIGNALWORKFLOW._serialized_end = 7171
+    _UPSERTWORKFLOWSEARCHATTRIBUTES._serialized_start = 7174
+    _UPSERTWORKFLOWSEARCHATTRIBUTES._serialized_end = 7404
+    _UPSERTWORKFLOWSEARCHATTRIBUTES_SEARCHATTRIBUTESENTRY._serialized_start = 5080
+    _UPSERTWORKFLOWSEARCHATTRIBUTES_SEARCHATTRIBUTESENTRY._serialized_end = 5168
+    _MODIFYWORKFLOWPROPERTIES._serialized_start = 7406
+    _MODIFYWORKFLOWPROPERTIES._serialized_end = 7485
+    _UPDATERESPONSE._serialized_start = 7488
+    _UPDATERESPONSE._serialized_end = 7698
 # @@protoc_insertion_point(module_scope)
diff --git a/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.pyi b/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.pyi
index ebd97abe..3bea766b 100644
--- a/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.pyi
+++ b/temporalio/bridge/proto/workflow_commands/workflow_commands_pb2.pyi
@@ -10,6 +10,7 @@ import builtins
 import collections.abc
 import google.protobuf.descriptor
 import google.protobuf.duration_pb2
+import google.protobuf.empty_pb2
 import google.protobuf.internal.containers
 import google.protobuf.internal.enum_type_wrapper
 import google.protobuf.message
@@ -91,6 +92,7 @@ class WorkflowCommand(google.protobuf.message.Message):
     REQUEST_CANCEL_LOCAL_ACTIVITY_FIELD_NUMBER: builtins.int
     UPSERT_WORKFLOW_SEARCH_ATTRIBUTES_FIELD_NUMBER: builtins.int
     MODIFY_WORKFLOW_PROPERTIES_FIELD_NUMBER: builtins.int
+    UPDATE_RESPONSE_FIELD_NUMBER: builtins.int
     @property
     def start_timer(self) -> global___StartTimer: ...
     @property
@@ -141,6 +143,8 @@ class WorkflowCommand(google.protobuf.message.Message):
     ) -> global___UpsertWorkflowSearchAttributes: ...
     @property
     def modify_workflow_properties(self) -> global___ModifyWorkflowProperties: ...
+    @property
+    def update_response(self) -> global___UpdateResponse: ...
     def __init__(
         self,
         *,
@@ -169,6 +173,7 @@ class WorkflowCommand(google.protobuf.message.Message):
         upsert_workflow_search_attributes: global___UpsertWorkflowSearchAttributes
         | None = ...,
         modify_workflow_properties: global___ModifyWorkflowProperties | None = ...,
+        update_response: global___UpdateResponse | None = ...,
     ) -> None: ...
     def HasField(
         self,
@@ -209,6 +214,8 @@ class WorkflowCommand(google.protobuf.message.Message):
             b"start_child_workflow_execution",
             "start_timer",
             b"start_timer",
+            "update_response",
+            b"update_response",
             "upsert_workflow_search_attributes",
             b"upsert_workflow_search_attributes",
             "variant",
@@ -254,6 +261,8 @@ class WorkflowCommand(google.protobuf.message.Message):
             b"start_child_workflow_execution",
             "start_timer",
             b"start_timer",
+            "update_response",
+            b"update_response",
             "upsert_workflow_search_attributes",
             b"upsert_workflow_search_attributes",
             "variant",
@@ -283,6 +292,7 @@ class WorkflowCommand(google.protobuf.message.Message):
             "request_cancel_local_activity",
             "upsert_workflow_search_attributes",
             "modify_workflow_properties",
+            "update_response",
         ]
         | None
     ): ...
@@ -1580,3 +1590,79 @@ class ModifyWorkflowProperties(google.protobuf.message.Message):
     ) -> None: ...
 
 global___ModifyWorkflowProperties = ModifyWorkflowProperties
+
+class UpdateResponse(google.protobuf.message.Message):
+    """A reply to a `DoUpdate` job - lang must run the update's validator if told to, and then
+    immediately run the handler, if the update was accepted.
+
+    There must always be an accepted or rejected response immediately, in the same activation as
+    this job, to indicate the result of the validator. Accepted for ran and accepted or skipped, or
+    rejected for rejected.
+
+    Then, in the same or any subsequent activation, after the update handler has completed, respond
+    with completed or rejected as appropriate for the result of the handler.
+    """
+
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    PROTOCOL_INSTANCE_ID_FIELD_NUMBER: builtins.int
+    ACCEPTED_FIELD_NUMBER: builtins.int
+    REJECTED_FIELD_NUMBER: builtins.int
+    COMPLETED_FIELD_NUMBER: builtins.int
+    protocol_instance_id: builtins.str
+    """The protocol message instance ID"""
+    @property
+    def accepted(self) -> google.protobuf.empty_pb2.Empty:
+        """Must be sent if the update's validator has passed (or lang was not asked to run it, and
+        thus should be considered already-accepted, allowing lang to always send the same
+        sequence on replay).
+        """
+    @property
+    def rejected(self) -> temporalio.api.failure.v1.message_pb2.Failure:
+        """Must be sent if the update's validator does not pass, or after acceptance if the update
+        handler fails.
+        """
+    @property
+    def completed(self) -> temporalio.api.common.v1.message_pb2.Payload:
+        """Must be sent once the update handler completes successfully."""
+    def __init__(
+        self,
+        *,
+        protocol_instance_id: builtins.str = ...,
+        accepted: google.protobuf.empty_pb2.Empty | None = ...,
+        rejected: temporalio.api.failure.v1.message_pb2.Failure | None = ...,
+        completed: temporalio.api.common.v1.message_pb2.Payload | None = ...,
+    ) -> None: ...
+    def HasField(
+        self,
+        field_name: typing_extensions.Literal[
+            "accepted",
+            b"accepted",
+            "completed",
+            b"completed",
+            "rejected",
+            b"rejected",
+            "response",
+            b"response",
+        ],
+    ) -> builtins.bool: ...
+    def ClearField(
+        self,
+        field_name: typing_extensions.Literal[
+            "accepted",
+            b"accepted",
+            "completed",
+            b"completed",
+            "protocol_instance_id",
+            b"protocol_instance_id",
+            "rejected",
+            b"rejected",
+            "response",
+            b"response",
+        ],
+    ) -> None: ...
+    def WhichOneof(
+        self, oneof_group: typing_extensions.Literal["response", b"response"]
+    ) -> typing_extensions.Literal["accepted", "rejected", "completed"] | None: ...
+
+global___UpdateResponse = UpdateResponse
diff --git a/temporalio/bridge/sdk-core b/temporalio/bridge/sdk-core
index 617612aa..7545ad12 160000
--- a/temporalio/bridge/sdk-core
+++ b/temporalio/bridge/sdk-core
@@ -1 +1 @@
-Subproject commit 617612aa419d687aebabcf0258ac86f5c36df189
+Subproject commit 7545ad126166412d282c8dfe43d1650d607867dd
diff --git a/temporalio/bridge/src/worker.rs b/temporalio/bridge/src/worker.rs
index 5d8be94a..151d7ce9 100644
--- a/temporalio/bridge/src/worker.rs
+++ b/temporalio/bridge/src/worker.rs
@@ -5,7 +5,7 @@ use pyo3::types::{PyBytes, PyTuple};
 use std::sync::Arc;
 use std::time::Duration;
 use temporal_sdk_core::api::errors::{PollActivityError, PollWfError};
-use temporal_sdk_core::replay::HistoryForReplay;
+use temporal_sdk_core::replay::{HistoryForReplay, ReplayWorkerInput};
 use temporal_sdk_core_api::Worker;
 use temporal_sdk_core_protos::coresdk::workflow_completion::WorkflowActivationCompletion;
 use temporal_sdk_core_protos::coresdk::{ActivityHeartbeat, ActivityTaskCompletion};
@@ -85,9 +85,9 @@ pub fn new_replay_worker<'a>(
     let (history_pusher, stream) = HistoryPusher::new(runtime_ref.runtime.clone());
     let worker = WorkerRef {
         worker: Some(Arc::new(
-            temporal_sdk_core::init_replay_worker(config, stream).map_err(|err| {
-                PyValueError::new_err(format!("Failed creating replay worker: {}", err))
-            })?,
+            temporal_sdk_core::init_replay_worker(ReplayWorkerInput::new(config, stream)).map_err(
+                |err| PyValueError::new_err(format!("Failed creating replay worker: {}", err)),
+            )?,
         )),
         runtime: runtime_ref.runtime.clone(),
     };
diff --git a/temporalio/client.py b/temporalio/client.py
index aceb3301..3ee53778 100644
--- a/temporalio/client.py
+++ b/temporalio/client.py
@@ -2,11 +2,13 @@
 
 from __future__ import annotations
 
+import asyncio
 import copy
 import dataclasses
 import inspect
 import json
 import re
+import sys
 import uuid
 import warnings
 from abc import ABC, abstractmethod
@@ -43,6 +45,7 @@
 import temporalio.api.history.v1
 import temporalio.api.schedule.v1
 import temporalio.api.taskqueue.v1
+import temporalio.api.update.v1
 import temporalio.api.workflow.v1
 import temporalio.api.workflowservice.v1
 import temporalio.common
@@ -1627,6 +1630,259 @@ async def terminate(
             )
         )
 
+    # Overload for no-param update
+    @overload
+    async def execute_update(
+        self,
+        update: temporalio.workflow.UpdateMethodMultiParam[[SelfType], LocalReturnType],
+        *,
+        id: Optional[str] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> LocalReturnType:
+        ...
+
+    # Overload for single-param update
+    @overload
+    async def execute_update(
+        self,
+        update: temporalio.workflow.UpdateMethodMultiParam[
+            [SelfType, ParamType], LocalReturnType
+        ],
+        arg: ParamType,
+        *,
+        id: Optional[str] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> LocalReturnType:
+        ...
+
+    # Overload for multi-param update
+    @overload
+    async def execute_update(
+        self,
+        update: temporalio.workflow.UpdateMethodMultiParam[
+            MultiParamSpec, LocalReturnType
+        ],
+        *,
+        args: MultiParamSpec.args,
+        id: Optional[str] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> LocalReturnType:
+        ...
+
+    # Overload for string-name update
+    @overload
+    async def execute_update(
+        self,
+        update: str,
+        arg: Any = temporalio.common._arg_unset,
+        *,
+        args: Sequence[Any] = [],
+        id: Optional[str] = None,
+        result_type: Optional[Type] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> Any:
+        ...
+
+    async def execute_update(
+        self,
+        update: Union[str, Callable],
+        arg: Any = temporalio.common._arg_unset,
+        *,
+        args: Sequence[Any] = [],
+        id: Optional[str] = None,
+        result_type: Optional[Type] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> Any:
+        """Send an update request to the workflow and wait for it to complete.
+
+        This will target the workflow with :py:attr:`run_id` if present. To use a
+        different run ID, create a new handle with via :py:meth:`Client.get_workflow_handle`.
+
+        .. warning::
+           This API is experimental
+
+        .. warning::
+            WorkflowHandles created as a result of :py:meth:`Client.start_workflow` will
+            send updates to the latest workflow with the same workflow ID even if it is
+            unrelated to the started workflow.
+
+        Args:
+            update: Update function or name on the workflow.
+            arg: Single argument to the update.
+            args: Multiple arguments to the update. Cannot be set if arg is.
+            id: ID of the update. If not set, the server will set a UUID as the ID.
+            result_type: For string updates, this can set the specific result
+                type hint to deserialize into.
+            rpc_metadata: Headers used on the RPC call. Keys here override
+                client-level RPC metadata keys.
+            rpc_timeout: Optional RPC deadline to set for the RPC call.
+
+        Raises:
+            WorkflowUpdateFailedError: If the update failed
+            RPCError: There was some issue sending the update to the workflow.
+        """
+        handle = await self._start_update(
+            update,
+            arg,
+            args=args,
+            id=id,
+            wait_for_stage=temporalio.api.enums.v1.UpdateWorkflowExecutionLifecycleStage.UPDATE_WORKFLOW_EXECUTION_LIFECYCLE_STAGE_COMPLETED,
+            result_type=result_type,
+            rpc_metadata=rpc_metadata,
+            rpc_timeout=rpc_timeout,
+        )
+        return await handle.result()
+
+    # Overload for no-param start update
+    @overload
+    async def start_update(
+        self,
+        update: temporalio.workflow.UpdateMethodMultiParam[[SelfType], LocalReturnType],
+        *,
+        id: Optional[str] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> WorkflowUpdateHandle[LocalReturnType]:
+        ...
+
+    # Overload for single-param start update
+    @overload
+    async def start_update(
+        self,
+        update: temporalio.workflow.UpdateMethodMultiParam[
+            [SelfType, ParamType], LocalReturnType
+        ],
+        arg: ParamType,
+        *,
+        id: Optional[str] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> WorkflowUpdateHandle[LocalReturnType]:
+        ...
+
+    # Overload for multi-param start update
+    @overload
+    async def start_update(
+        self,
+        update: temporalio.workflow.UpdateMethodMultiParam[
+            MultiParamSpec, LocalReturnType
+        ],
+        *,
+        args: MultiParamSpec.args,
+        id: Optional[str] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> WorkflowUpdateHandle[LocalReturnType]:
+        ...
+
+    # Overload for string-name start update
+    @overload
+    async def start_update(
+        self,
+        update: str,
+        arg: Any = temporalio.common._arg_unset,
+        *,
+        args: Sequence[Any] = [],
+        id: Optional[str] = None,
+        result_type: Optional[Type] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> WorkflowUpdateHandle[Any]:
+        ...
+
+    async def start_update(
+        self,
+        update: Union[str, Callable],
+        arg: Any = temporalio.common._arg_unset,
+        *,
+        args: Sequence[Any] = [],
+        id: Optional[str] = None,
+        result_type: Optional[Type] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> WorkflowUpdateHandle[Any]:
+        """Send an update request to the workflow and return a handle to it.
+
+        This will target the workflow with :py:attr:`run_id` if present. To use a
+        different run ID, create a new handle with via :py:meth:`Client.get_workflow_handle`.
+
+        .. warning::
+           This API is experimental
+
+        .. warning::
+            WorkflowHandles created as a result of :py:meth:`Client.start_workflow` will
+            send updates to the latest workflow with the same workflow ID even if it is
+            unrelated to the started workflow.
+
+        Args:
+            update: Update function or name on the workflow.
+            arg: Single argument to the update.
+            args: Multiple arguments to the update. Cannot be set if arg is.
+            id: ID of the update. If not set, the server will set a UUID as the ID.
+            result_type: For string updates, this can set the specific result
+                type hint to deserialize into.
+            rpc_metadata: Headers used on the RPC call. Keys here override
+                client-level RPC metadata keys.
+            rpc_timeout: Optional RPC deadline to set for the RPC call.
+
+        Raises:
+            RPCError: There was some issue sending the update to the workflow.
+        """
+        return await self._start_update(
+            update,
+            arg,
+            args=args,
+            id=id,
+            wait_for_stage=temporalio.api.enums.v1.UpdateWorkflowExecutionLifecycleStage.UPDATE_WORKFLOW_EXECUTION_LIFECYCLE_STAGE_ACCEPTED,
+            result_type=result_type,
+            rpc_metadata=rpc_metadata,
+            rpc_timeout=rpc_timeout,
+        )
+
+    async def _start_update(
+        self,
+        update: Union[str, Callable],
+        arg: Any = temporalio.common._arg_unset,
+        *,
+        args: Sequence[Any] = [],
+        id: Optional[str] = None,
+        wait_for_stage: temporalio.api.enums.v1.UpdateWorkflowExecutionLifecycleStage.ValueType = temporalio.api.enums.v1.UpdateWorkflowExecutionLifecycleStage.UPDATE_WORKFLOW_EXECUTION_LIFECYCLE_STAGE_ADMITTED,
+        result_type: Optional[Type] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> WorkflowUpdateHandle[Any]:
+        update_name: str
+        ret_type = result_type
+        if isinstance(update, temporalio.workflow.UpdateMethodMultiParam):
+            defn = update._defn
+            if not defn.name:
+                raise RuntimeError("Cannot invoke dynamic update definition")
+            # TODO(cretz): Check count/type of args at runtime?
+            update_name = defn.name
+            ret_type = defn.ret_type
+        else:
+            update_name = str(update)
+
+        return await self._client._impl.start_workflow_update(
+            StartWorkflowUpdateInput(
+                id=self._id,
+                run_id=self._run_id,
+                update_id=id,
+                update=update_name,
+                args=temporalio.common._arg_or_args(arg, args),
+                headers={},
+                ret_type=ret_type,
+                rpc_metadata=rpc_metadata,
+                rpc_timeout=rpc_timeout,
+                wait_for_stage=wait_for_stage,
+            )
+        )
+
 
 @dataclass(frozen=True)
 class AsyncActivityIDReference:
@@ -2711,7 +2967,9 @@ class ScheduleActionStartWorkflow(ScheduleAction):
     headers: Optional[Mapping[str, temporalio.api.common.v1.Payload]] = None
 
     @staticmethod
-    def _from_proto(info: temporalio.api.workflow.v1.NewWorkflowExecutionInfo) -> ScheduleActionStartWorkflow:  # type: ignore[override]
+    def _from_proto(
+        info: temporalio.api.workflow.v1.NewWorkflowExecutionInfo,  # type: ignore[override]
+    ) -> ScheduleActionStartWorkflow:
         return ScheduleActionStartWorkflow("<unset>", raw_info=info)
 
     # Overload for no-param workflow
@@ -3679,6 +3937,89 @@ async def __anext__(self) -> ScheduleListDescription:
             return ret
 
 
+class WorkflowUpdateHandle(Generic[LocalReturnType]):
+    """Handle for a workflow update execution request."""
+
+    def __init__(
+        self,
+        client: Client,
+        id: str,
+        workflow_id: str,
+        *,
+        workflow_run_id: Optional[str] = None,
+        result_type: Optional[Type] = None,
+    ):
+        """Create a workflow update handle.
+
+        Users should not create this directly, but rather use
+        :py:meth:`Client.start_workflow_update`.
+        """
+        self._client = client
+        self._id = id
+        self._workflow_id = workflow_id
+        self._workflow_run_id = workflow_run_id
+        self._result_type = result_type
+        self._known_outcome: Optional[temporalio.api.update.v1.Outcome] = None
+
+    @property
+    def id(self) -> str:
+        """ID of this Update request."""
+        return self._id
+
+    @property
+    def workflow_id(self) -> str:
+        """The ID of the Workflow targeted by this Update."""
+        return self._workflow_id
+
+    @property
+    def workflow_run_id(self) -> Optional[str]:
+        """If specified, the specific run of the Workflow targeted by this Update."""
+        return self._workflow_run_id
+
+    async def result(
+        self,
+        *,
+        timeout: Optional[timedelta] = None,
+        rpc_metadata: Mapping[str, str] = {},
+        rpc_timeout: Optional[timedelta] = None,
+    ) -> LocalReturnType:
+        """Wait for and return the result of the update. The result may already be known in which case no network call
+        is made. Otherwise the result will be polled for until returned, or until the provided timeout is reached, if
+        specified.
+
+        Args:
+            timeout: Optional timeout specifying maximum wait time for the result.
+            rpc_metadata: Headers used on the RPC call. Keys here override client-level RPC metadata keys.
+            rpc_timeout: Optional RPC deadline to set for the RPC call. If this elapses, the poll is retried until the
+                overall timeout has been reached.
+
+        Raises:
+            WorkflowUpdateFailedError: If the update failed
+            TimeoutError: The specified timeout was reached when waiting for the update result.
+            RPCError: Update result could not be fetched for some other reason.
+        """
+        if self._known_outcome is not None:
+            outcome = self._known_outcome
+            return await _update_outcome_to_result(
+                outcome,
+                self.id,
+                self._client.data_converter,
+                self._result_type,
+            )
+
+        return await self._client._impl.poll_workflow_update(
+            PollWorkflowUpdateInput(
+                self.workflow_id,
+                self.workflow_run_id,
+                self.id,
+                timeout,
+                self._result_type,
+                rpc_metadata,
+                rpc_timeout,
+            )
+        )
+
+
 class WorkflowFailureError(temporalio.exceptions.TemporalError):
     """Error that occurs when a workflow is unsuccessful."""
 
@@ -3736,6 +4077,21 @@ def message(self) -> str:
         return self._message
 
 
+class WorkflowUpdateFailedError(temporalio.exceptions.TemporalError):
+    """Error that occurs when an update fails."""
+
+    def __init__(self, cause: BaseException) -> None:
+        """Create workflow update failed error."""
+        super().__init__("Workflow update failed")
+        self.__cause__ = cause
+
+    @property
+    def cause(self) -> BaseException:
+        """Cause of the update failure."""
+        assert self.__cause__
+        return self.__cause__
+
+
 class AsyncActivityCancelledError(temporalio.exceptions.TemporalError):
     """Error that occurs when async activity attempted heartbeat but was cancelled."""
 
@@ -3867,6 +4223,37 @@ class TerminateWorkflowInput:
     rpc_timeout: Optional[timedelta]
 
 
+@dataclass
+class StartWorkflowUpdateInput:
+    """Input for :py:meth:`OutboundInterceptor.start_workflow_update`."""
+
+    id: str
+    run_id: Optional[str]
+    update_id: Optional[str]
+    update: str
+    args: Sequence[Any]
+    wait_for_stage: Optional[
+        temporalio.api.enums.v1.UpdateWorkflowExecutionLifecycleStage.ValueType
+    ]
+    headers: Mapping[str, temporalio.api.common.v1.Payload]
+    ret_type: Optional[Type]
+    rpc_metadata: Mapping[str, str]
+    rpc_timeout: Optional[timedelta]
+
+
+@dataclass
+class PollWorkflowUpdateInput:
+    """Input for :py:meth:`OutboundInterceptor.poll_workflow_update`."""
+
+    workflow_id: str
+    run_id: Optional[str]
+    update_id: str
+    timeout: Optional[timedelta]
+    ret_type: Optional[Type]
+    rpc_metadata: Mapping[str, str]
+    rpc_timeout: Optional[timedelta]
+
+
 @dataclass
 class HeartbeatAsyncActivityInput:
     """Input for :py:meth:`OutboundInterceptor.heartbeat_async_activity`."""
@@ -4111,6 +4498,16 @@ async def terminate_workflow(self, input: TerminateWorkflowInput) -> None:
         """Called for every :py:meth:`WorkflowHandle.terminate` call."""
         await self.next.terminate_workflow(input)
 
+    async def start_workflow_update(
+        self, input: StartWorkflowUpdateInput
+    ) -> WorkflowUpdateHandle[Any]:
+        """Called for every :py:meth:`WorkflowHandle.update` and :py:meth:`WorkflowHandle.start_update` call."""
+        return await self.next.start_workflow_update(input)
+
+    async def poll_workflow_update(self, input: PollWorkflowUpdateInput) -> Any:
+        """May be called when calling :py:meth:`WorkflowUpdateHandle.result`."""
+        return await self.next.poll_workflow_update(input)
+
     ### Async activity calls
 
     async def heartbeat_async_activity(
@@ -4435,6 +4832,101 @@ async def terminate_workflow(self, input: TerminateWorkflowInput) -> None:
             req, retry=True, metadata=input.rpc_metadata, timeout=input.rpc_timeout
         )
 
+    async def start_workflow_update(
+        self, input: StartWorkflowUpdateInput
+    ) -> WorkflowUpdateHandle[Any]:
+        wait_policy = (
+            temporalio.api.update.v1.WaitPolicy(lifecycle_stage=input.wait_for_stage)
+            if input.wait_for_stage is not None
+            else None
+        )
+        req = temporalio.api.workflowservice.v1.UpdateWorkflowExecutionRequest(
+            namespace=self._client.namespace,
+            workflow_execution=temporalio.api.common.v1.WorkflowExecution(
+                workflow_id=input.id,
+                run_id=input.run_id or "",
+            ),
+            request=temporalio.api.update.v1.Request(
+                meta=temporalio.api.update.v1.Meta(
+                    update_id=input.update_id or "",
+                    identity=self._client.identity,
+                ),
+                input=temporalio.api.update.v1.Input(
+                    name=input.update,
+                ),
+            ),
+            wait_policy=wait_policy,
+        )
+        if input.args:
+            req.request.input.args.payloads.extend(
+                await self._client.data_converter.encode(input.args)
+            )
+        if input.headers is not None:
+            temporalio.common._apply_headers(
+                input.headers, req.request.input.header.fields
+            )
+        try:
+            resp = await self._client.workflow_service.update_workflow_execution(
+                req, retry=True, metadata=input.rpc_metadata, timeout=input.rpc_timeout
+            )
+        except RPCError as err:
+            raise
+
+        determined_id = resp.update_ref.update_id
+        update_handle: WorkflowUpdateHandle[Any] = WorkflowUpdateHandle(
+            client=self._client,
+            id=determined_id,
+            workflow_id=input.id,
+            workflow_run_id=input.run_id,
+            result_type=input.ret_type,
+        )
+        if resp.HasField("outcome"):
+            update_handle._known_outcome = resp.outcome
+
+        return update_handle
+
+    async def poll_workflow_update(self, input: PollWorkflowUpdateInput) -> Any:
+        req = temporalio.api.workflowservice.v1.PollWorkflowExecutionUpdateRequest(
+            namespace=self._client.namespace,
+            update_ref=temporalio.api.update.v1.UpdateRef(
+                workflow_execution=temporalio.api.common.v1.WorkflowExecution(
+                    workflow_id=input.workflow_id,
+                    run_id=input.run_id or "",
+                ),
+                update_id=input.update_id,
+            ),
+            identity=self._client.identity,
+            wait_policy=temporalio.api.update.v1.WaitPolicy(
+                lifecycle_stage=temporalio.api.enums.v1.UpdateWorkflowExecutionLifecycleStage.UPDATE_WORKFLOW_EXECUTION_LIFECYCLE_STAGE_COMPLETED
+            ),
+        )
+
+        async def poll_loop():
+            # Continue polling as long as we have either an empty response, or an *rpc* timeout
+            while True:
+                try:
+                    res = await self._client.workflow_service.poll_workflow_execution_update(
+                        req,
+                        retry=True,
+                        metadata=input.rpc_metadata,
+                        timeout=input.rpc_timeout,
+                    )
+                    if res.HasField("outcome"):
+                        return await _update_outcome_to_result(
+                            res.outcome,
+                            input.update_id,
+                            self._client.data_converter,
+                            input.ret_type,
+                        )
+                except RPCError as err:
+                    if err.status != RPCStatusCode.DEADLINE_EXCEEDED:
+                        raise
+
+        # Wait for at most the *overall* timeout
+        return await asyncio.wait_for(
+            poll_loop(), input.timeout.total_seconds() if input.timeout else None
+        )
+
     ### Async activity calls
 
     async def heartbeat_async_activity(
@@ -4963,6 +5455,27 @@ def _fix_history_enum(prefix: str, parent: Dict[str, Any], *attrs: str) -> None:
                     _fix_history_enum(prefix, child_item, *attrs[1:])
 
 
+async def _update_outcome_to_result(
+    outcome: temporalio.api.update.v1.Outcome,
+    id: str,
+    converter: temporalio.converter.DataConverter,
+    rtype: Optional[Type],
+) -> Any:
+    if outcome.HasField("failure"):
+        raise WorkflowUpdateFailedError(
+            await converter.decode_failure(outcome.failure),
+        )
+    if not outcome.success.payloads:
+        return None
+    type_hints = [rtype] if rtype else None
+    results = await converter.decode(outcome.success.payloads, type_hints)
+    if not results:
+        return None
+    elif len(results) > 1:
+        warnings.warn(f"Expected single update result, got {len(results)}")
+    return results[0]
+
+
 @dataclass(frozen=True)
 class WorkerBuildIdVersionSets:
     """Represents the sets of compatible Build ID versions associated with some Task Queue, as
diff --git a/temporalio/contrib/opentelemetry.py b/temporalio/contrib/opentelemetry.py
index 2701afa1..3f292098 100644
--- a/temporalio/contrib/opentelemetry.py
+++ b/temporalio/contrib/opentelemetry.py
@@ -244,6 +244,17 @@ async def signal_workflow(
         ):
             return await super().signal_workflow(input)
 
+    async def start_workflow_update(
+        self, input: temporalio.client.StartWorkflowUpdateInput
+    ) -> temporalio.client.WorkflowUpdateHandle[Any]:
+        with self.root._start_as_current_span(
+            f"StartWorkflowUpdate:{input.update}",
+            attributes={"temporalWorkflowID": input.id},
+            input=input,
+            kind=opentelemetry.trace.SpanKind.CLIENT,
+        ):
+            return await super().start_workflow_update(input)
+
 
 class _TracingActivityInboundInterceptor(temporalio.worker.ActivityInboundInterceptor):
     def __init__(
@@ -404,6 +415,46 @@ async def handle_query(self, input: temporalio.worker.HandleQueryInput) -> Any:
         finally:
             opentelemetry.context.detach(token)
 
+    def handle_update_validator(
+        self, input: temporalio.worker.HandleUpdateInput
+    ) -> None:
+        """Implementation of
+        :py:meth:`temporalio.worker.WorkflowInboundInterceptor.handle_update_validator`.
+        """
+        link_context_header = input.headers.get(self.header_key)
+        link_context_carrier: Optional[_CarrierDict] = None
+        if link_context_header:
+            link_context_carrier = self.payload_converter.from_payloads(
+                [link_context_header]
+            )[0]
+        with self._top_level_workflow_context(success_is_complete=False):
+            self._completed_span(
+                f"ValidateUpdate:{input.update}",
+                link_context_carrier=link_context_carrier,
+                kind=opentelemetry.trace.SpanKind.SERVER,
+            )
+            super().handle_update_validator(input)
+
+    async def handle_update_handler(
+        self, input: temporalio.worker.HandleUpdateInput
+    ) -> Any:
+        """Implementation of
+        :py:meth:`temporalio.worker.WorkflowInboundInterceptor.handle_update_handler`.
+        """
+        link_context_header = input.headers.get(self.header_key)
+        link_context_carrier: Optional[_CarrierDict] = None
+        if link_context_header:
+            link_context_carrier = self.payload_converter.from_payloads(
+                [link_context_header]
+            )[0]
+        with self._top_level_workflow_context(success_is_complete=False):
+            self._completed_span(
+                f"HandleUpdate:{input.update}",
+                link_context_carrier=link_context_carrier,
+                kind=opentelemetry.trace.SpanKind.SERVER,
+            )
+            return await super().handle_update_handler(input)
+
     def _load_workflow_context_carrier(self) -> Optional[_CarrierDict]:
         if self._workflow_context_carrier:
             return self._workflow_context_carrier
diff --git a/temporalio/types.py b/temporalio/types.py
index d6590338..c6528a84 100644
--- a/temporalio/types.py
+++ b/temporalio/types.py
@@ -12,6 +12,10 @@
 LocalReturnType = TypeVar("LocalReturnType", covariant=True)
 CallableType = TypeVar("CallableType", bound=Callable[..., Any])
 CallableAsyncType = TypeVar("CallableAsyncType", bound=Callable[..., Awaitable[Any]])
+CallableSyncOrAsyncType = TypeVar(
+    "CallableSyncOrAsyncType",
+    bound=Callable[..., Union[Any, Awaitable[Any]]],
+)
 CallableSyncOrAsyncReturnNoneType = TypeVar(
     "CallableSyncOrAsyncReturnNoneType",
     bound=Callable[..., Union[None, Awaitable[None]]],
diff --git a/temporalio/worker/__init__.py b/temporalio/worker/__init__.py
index b7804e54..aa7936e6 100644
--- a/temporalio/worker/__init__.py
+++ b/temporalio/worker/__init__.py
@@ -9,6 +9,7 @@
     ExecuteWorkflowInput,
     HandleQueryInput,
     HandleSignalInput,
+    HandleUpdateInput,
     Interceptor,
     SignalChildWorkflowInput,
     SignalExternalWorkflowInput,
@@ -53,6 +54,7 @@
     "ExecuteWorkflowInput",
     "HandleQueryInput",
     "HandleSignalInput",
+    "HandleUpdateInput",
     "SignalChildWorkflowInput",
     "SignalExternalWorkflowInput",
     "StartActivityInput",
diff --git a/temporalio/worker/_interceptor.py b/temporalio/worker/_interceptor.py
index 19283e01..af85161d 100644
--- a/temporalio/worker/_interceptor.py
+++ b/temporalio/worker/_interceptor.py
@@ -190,6 +190,18 @@ class HandleQueryInput:
     headers: Mapping[str, temporalio.api.common.v1.Payload]
 
 
+@dataclass
+class HandleUpdateInput:
+    """Input for :py:meth:`WorkflowInboundInterceptor.handle_update_validator`
+    and :py:meth:`WorkflowInboundInterceptor.handle_update_handler`.
+    """
+
+    id: str
+    update: str
+    args: Sequence[Any]
+    headers: Mapping[str, temporalio.api.common.v1.Payload]
+
+
 @dataclass
 class SignalChildWorkflowInput:
     """Input for :py:meth:`WorkflowOutboundInterceptor.signal_child_workflow`."""
@@ -314,6 +326,14 @@ async def handle_query(self, input: HandleQueryInput) -> Any:
         """Called to handle a query."""
         return await self.next.handle_query(input)
 
+    def handle_update_validator(self, input: HandleUpdateInput) -> None:
+        """Called to handle an update's validation stage."""
+        self.next.handle_update_validator(input)
+
+    async def handle_update_handler(self, input: HandleUpdateInput) -> Any:
+        """Called to handle an update's handler."""
+        return await self.next.handle_update_handler(input)
+
 
 class WorkflowOutboundInterceptor:
     """Outbound interceptor to wrap calls made from within workflows.
diff --git a/temporalio/worker/_workflow_instance.py b/temporalio/worker/_workflow_instance.py
index d5afece7..939f68ae 100644
--- a/temporalio/worker/_workflow_instance.py
+++ b/temporalio/worker/_workflow_instance.py
@@ -37,6 +37,7 @@
     cast,
 )
 
+import google.protobuf.empty_pb2
 from typing_extensions import TypeAlias, TypedDict
 
 import temporalio.activity
@@ -57,6 +58,7 @@
     ExecuteWorkflowInput,
     HandleQueryInput,
     HandleSignalInput,
+    HandleUpdateInput,
     SignalChildWorkflowInput,
     SignalExternalWorkflowInput,
     StartActivityInput,
@@ -209,10 +211,11 @@ def __init__(self, det: WorkflowInstanceDetails) -> None:
         # See https://bugs.python.org/issue21163 and others.
         self._tasks: Set[asyncio.Task] = set()
 
-        # We maintain signals and queries on this class since handlers can be
+        # We maintain signals, queries, and updates on this class since handlers can be
         # added during workflow execution
         self._signals = dict(self._defn.signals)
         self._queries = dict(self._defn.queries)
+        self._updates = dict(self._defn.updates)
 
         # Add stack trace handler
         # TODO(cretz): Is it ok that this can be forcefully overridden by the
@@ -367,6 +370,8 @@ def _apply(
     ) -> None:
         if job.HasField("cancel_workflow"):
             self._apply_cancel_workflow(job.cancel_workflow)
+        elif job.HasField("do_update"):
+            self._apply_do_update(job.do_update)
         elif job.HasField("fire_timer"):
             self._apply_fire_timer(job.fire_timer)
         elif job.HasField("query_workflow"):
@@ -414,6 +419,120 @@ def _apply_cancel_workflow(
             # this cancellation to the next iteration of the event loop.
             self.call_soon(self._primary_task.cancel)
 
+    def _apply_do_update(
+        self, job: temporalio.bridge.proto.workflow_activation.DoUpdate
+    ):
+        # Run the validator & handler in a task. Everything, including looking up the update definition, needs to be
+        # inside the task, since the update may not be defined until after we have started the workflow - for example
+        # if an update is in the first WFT & is also registered dynamically at the top of workflow code.
+        async def run_update() -> None:
+            command = self._add_command()
+            command.update_response.protocol_instance_id = job.protocol_instance_id
+            past_validation = False
+            try:
+                defn = self._updates.get(job.name) or self._updates.get(None)
+                if not defn:
+                    known_updates = sorted([k for k in self._updates.keys() if k])
+                    raise RuntimeError(
+                        f"Update handler for '{job.name}' expected but not found, and there is no dynamic handler. "
+                        f"known updates: [{' '.join(known_updates)}]"
+                    )
+                args = self._process_handler_args(
+                    job.name,
+                    job.input,
+                    defn.name,
+                    defn.arg_types,
+                    defn.dynamic_vararg,
+                )
+                handler_input = HandleUpdateInput(
+                    id=job.id,
+                    update=job.name,
+                    args=args,
+                    headers=job.headers,
+                )
+
+                if job.run_validator and defn.validator is not None:
+                    with self._as_read_only():
+                        self._inbound.handle_update_validator(handler_input)
+                        # Re-process arguments to avoid any problems caused by user mutation of them during validation
+                        args = self._process_handler_args(
+                            job.name,
+                            job.input,
+                            defn.name,
+                            defn.arg_types,
+                            defn.dynamic_vararg,
+                        )
+                        handler_input.args = args
+
+                past_validation = True
+                # Accept the update
+                command.update_response.accepted.SetInParent()
+                command = None  # type: ignore
+
+                # Run the handler
+                success = await self._inbound.handle_update_handler(handler_input)
+                result_payloads = self._payload_converter.to_payloads([success])
+                if len(result_payloads) != 1:
+                    raise ValueError(
+                        f"Expected 1 result payload, got {len(result_payloads)}"
+                    )
+                command = self._add_command()
+                command.update_response.protocol_instance_id = job.protocol_instance_id
+                command.update_response.completed.CopyFrom(result_payloads[0])
+            except (Exception, asyncio.CancelledError) as err:
+                logger.debug(
+                    f"Update raised failure with run ID {self._info.run_id}",
+                    exc_info=True,
+                )
+                # All asyncio cancelled errors become Temporal cancelled errors
+                if isinstance(err, asyncio.CancelledError):
+                    err = temporalio.exceptions.CancelledError(
+                        f"Cancellation raised within update {err}"
+                    )
+                # Read-only issues during validation should fail the task
+                if isinstance(err, temporalio.workflow.ReadOnlyContextError):
+                    self._current_activation_error = err
+                    return
+                # Temporal errors always fail the update. Other errors fail it during validation, but the task during
+                # handling.
+                if (
+                    isinstance(err, temporalio.exceptions.FailureError)
+                    or not past_validation
+                ):
+                    if command is None:
+                        command = self._add_command()
+                        command.update_response.protocol_instance_id = (
+                            job.protocol_instance_id
+                        )
+                    command.update_response.rejected.SetInParent()
+                    self._failure_converter.to_failure(
+                        err,
+                        self._payload_converter,
+                        command.update_response.rejected,
+                    )
+                else:
+                    self._current_activation_error = err
+                    return
+            except BaseException as err:
+                # During tear down, generator exit and no-runtime exceptions can appear
+                if not self._deleting:
+                    raise
+                if not isinstance(
+                    err,
+                    (
+                        GeneratorExit,
+                        temporalio.workflow._NotInWorkflowEventLoopError,
+                    ),
+                ):
+                    logger.debug(
+                        "Ignoring exception while deleting workflow", exc_info=True
+                    )
+
+        self.create_task(
+            run_update(),
+            name=f"update: {job.name}",
+        )
+
     def _apply_fire_timer(
         self, job: temporalio.bridge.proto.workflow_activation.FireTimer
     ) -> None:
@@ -767,6 +886,20 @@ def workflow_get_signal_handler(self, name: Optional[str]) -> Optional[Callable]
         # Bind if a method
         return defn.bind_fn(self._object) if defn.is_method else defn.fn
 
+    def workflow_get_update_handler(self, name: Optional[str]) -> Optional[Callable]:
+        defn = self._updates.get(name)
+        if not defn:
+            return None
+        # Bind if a method
+        return defn.bind_fn(self._object) if defn.is_method else defn.fn
+
+    def workflow_get_update_validator(self, name: Optional[str]) -> Optional[Callable]:
+        defn = self._updates.get(name) or self._updates.get(None)
+        if not defn or not defn.validator:
+            return None
+        # Bind if a method
+        return defn.bind_validator(self._object) if defn.is_method else defn.validator
+
     def workflow_info(self) -> temporalio.workflow.Info:
         return self._outbound.info()
 
@@ -886,6 +1019,27 @@ def workflow_set_signal_handler(
         else:
             self._signals.pop(name, None)
 
+    def workflow_set_update_handler(
+        self,
+        name: Optional[str],
+        handler: Optional[Callable],
+        validator: Optional[Callable],
+    ) -> None:
+        self._assert_not_read_only("set update handler")
+        if handler:
+            defn = temporalio.workflow._UpdateDefinition(
+                name=name, fn=handler, is_method=False
+            )
+            if validator is not None:
+                defn.set_validator(validator)
+            self._updates[name] = defn
+            if defn.dynamic_vararg:
+                raise RuntimeError(
+                    "Dynamic updates do not support a vararg third param, use Sequence[RawValue]",
+                )
+        else:
+            self._updates.pop(name, None)
+
     def workflow_start_activity(
         self,
         activity: Any,
@@ -1654,6 +1808,26 @@ async def handle_query(self, input: HandleQueryInput) -> Any:
         else:
             return handler(*input.args)
 
+    def handle_update_validator(self, input: HandleUpdateInput) -> None:
+        # Do not "or None" the validator, since we only want to use the validator for
+        # the specific named update - we shouldn't fall back to the dynamic validator
+        # for some defined, named update which doesn't have a defined validator.
+        handler = self._instance.workflow_get_update_validator(input.update)
+        # Validator may not be defined
+        if handler is not None:
+            handler(*input.args)
+
+    async def handle_update_handler(self, input: HandleUpdateInput) -> Any:
+        handler = self._instance.workflow_get_update_handler(
+            input.update
+        ) or self._instance.workflow_get_update_handler(None)
+        # Handler should always be present at this point
+        assert handler
+        if inspect.iscoroutinefunction(handler):
+            return await handler(*input.args)
+        else:
+            return handler(*input.args)
+
 
 class _WorkflowOutboundImpl(WorkflowOutboundInterceptor):
     def __init__(self, instance: _WorkflowInstanceImpl) -> None:
diff --git a/temporalio/workflow.py b/temporalio/workflow.py
index 2d5a7646..e28e47c0 100644
--- a/temporalio/workflow.py
+++ b/temporalio/workflow.py
@@ -36,7 +36,13 @@
     overload,
 )
 
-from typing_extensions import Concatenate, Literal, TypedDict
+from typing_extensions import (
+    Concatenate,
+    Literal,
+    Protocol,
+    TypedDict,
+    runtime_checkable,
+)
 
 import temporalio.api.common.v1
 import temporalio.bridge.proto.child_workflow
@@ -52,6 +58,7 @@
     CallableAsyncType,
     CallableSyncNoParam,
     CallableSyncOrAsyncReturnNoneType,
+    CallableSyncOrAsyncType,
     CallableSyncSingleParam,
     CallableType,
     ClassType,
@@ -63,6 +70,7 @@
     MethodSyncSingleParam,
     MultiParamSpec,
     ParamType,
+    ProtocolReturnType,
     ReturnType,
     SelfType,
 )
@@ -446,6 +454,14 @@ def workflow_get_query_handler(self, name: Optional[str]) -> Optional[Callable]:
     def workflow_get_signal_handler(self, name: Optional[str]) -> Optional[Callable]:
         ...
 
+    @abstractmethod
+    def workflow_get_update_handler(self, name: Optional[str]) -> Optional[Callable]:
+        ...
+
+    @abstractmethod
+    def workflow_get_update_validator(self, name: Optional[str]) -> Optional[Callable]:
+        ...
+
     @abstractmethod
     def workflow_info(self) -> Info:
         ...
@@ -496,6 +512,15 @@ def workflow_set_signal_handler(
     ) -> None:
         ...
 
+    @abstractmethod
+    def workflow_set_update_handler(
+        self,
+        name: Optional[str],
+        handler: Optional[Callable],
+        validator: Optional[Callable],
+    ) -> None:
+        ...
+
     @abstractmethod
     def workflow_start_activity(
         self,
@@ -746,6 +771,124 @@ def time_ns() -> int:
     return _Runtime.current().workflow_time_ns()
 
 
+# Needs to be defined here to avoid a circular import
+@runtime_checkable
+class UpdateMethodMultiParam(Protocol[MultiParamSpec, ProtocolReturnType]):
+    """Decorated workflow update functions implement this."""
+
+    _defn: temporalio.workflow._UpdateDefinition
+
+    def __call__(
+        self, *args: MultiParamSpec.args, **kwargs: MultiParamSpec.kwargs
+    ) -> Union[ProtocolReturnType, Awaitable[ProtocolReturnType]]:
+        """Generic callable type callback."""
+        ...
+
+    def validator(
+        self, vfunc: Callable[MultiParamSpec, None]
+    ) -> Callable[MultiParamSpec, None]:
+        """Use to decorate a function to validate the arguments passed to the update handler."""
+        ...
+
+
+@overload
+def update(
+    fn: Callable[MultiParamSpec, Awaitable[ReturnType]]
+) -> UpdateMethodMultiParam[MultiParamSpec, ReturnType]:
+    ...
+
+
+@overload
+def update(
+    fn: Callable[MultiParamSpec, ReturnType]
+) -> UpdateMethodMultiParam[MultiParamSpec, ReturnType]:
+    ...
+
+
+@overload
+def update(
+    *, name: str
+) -> Callable[
+    [Callable[MultiParamSpec, ReturnType]],
+    UpdateMethodMultiParam[MultiParamSpec, ReturnType],
+]:
+    ...
+
+
+@overload
+def update(
+    *, dynamic: Literal[True]
+) -> Callable[
+    [Callable[MultiParamSpec, ReturnType]],
+    UpdateMethodMultiParam[MultiParamSpec, ReturnType],
+]:
+    ...
+
+
+def update(
+    fn: Optional[CallableSyncOrAsyncType] = None,
+    *,
+    name: Optional[str] = None,
+    dynamic: Optional[bool] = False,
+):
+    """Decorator for a workflow update handler method.
+
+    This is set on any async or non-async method that you wish to be called upon
+    receiving an update. If a function overrides one with this decorator, it too
+    must be decorated.
+
+    You may also optionally define a validator method that will be called before
+    this handler you have applied this decorator to. You can specify the validator
+    with ``@update_handler_function_name.validator``.
+
+    Update methods can only have positional parameters. Best practice for
+    non-dynamic update methods is to only take a single object/dataclass
+    argument that can accept more fields later if needed. The handler may return
+    a serializable value which will be sent back to the caller of the update.
+
+    .. warning::
+       This API is experimental
+
+    Args:
+        fn: The function to decorate.
+        name: Update name. Defaults to method ``__name__``. Cannot be present
+            when ``dynamic`` is present.
+        dynamic: If true, this handles all updates not otherwise handled. The
+            parameters of the method must be self, a string name, and a
+            ``*args`` positional varargs. Cannot be present when ``name`` is
+            present.
+    """
+
+    def with_name(
+        name: Optional[str], fn: CallableSyncOrAsyncType
+    ) -> CallableSyncOrAsyncType:
+        defn = _UpdateDefinition(name=name, fn=fn, is_method=True)
+        if defn.dynamic_vararg:
+            raise RuntimeError(
+                "Dynamic updates do not support a vararg third param, use Sequence[RawValue]",
+            )
+        setattr(fn, "_defn", defn)
+        setattr(fn, "validator", partial(_update_validator, defn))
+        return fn
+
+    if name is not None or dynamic:
+        if name is not None and dynamic:
+            raise RuntimeError("Cannot provide name and dynamic boolean")
+        return partial(with_name, name)
+    if fn is None:
+        raise RuntimeError("Cannot create update without function or name or dynamic")
+    return with_name(fn.__name__, fn)
+
+
+def _update_validator(
+    update_def: _UpdateDefinition, fn: Optional[Callable[..., None]] = None
+) -> Optional[Callable[..., None]]:
+    """Decorator for a workflow update validator method."""
+    if fn is not None:
+        update_def.set_validator(fn)
+    return fn
+
+
 def upsert_search_attributes(attributes: temporalio.common.SearchAttributes) -> None:
     """Upsert search attributes for this workflow.
 
@@ -952,6 +1095,7 @@ class _Definition:
     run_fn: Callable[..., Awaitable]
     signals: Mapping[Optional[str], _SignalDefinition]
     queries: Mapping[Optional[str], _QueryDefinition]
+    updates: Mapping[Optional[str], _UpdateDefinition]
     sandboxed: bool
     # Types loaded on post init if both are None
     arg_types: Optional[List[Type]] = None
@@ -998,12 +1142,13 @@ def _apply_to_class(
             raise ValueError("Class already contains workflow definition")
         issues: List[str] = []
 
-        # Collect run fn and all signal/query fns
+        # Collect run fn and all signal/query/update fns
         members = inspect.getmembers(cls)
         run_fn: Optional[Callable[..., Awaitable[Any]]] = None
         seen_run_attr = False
         signals: Dict[Optional[str], _SignalDefinition] = {}
         queries: Dict[Optional[str], _QueryDefinition] = {}
+        updates: Dict[Optional[str], _UpdateDefinition] = {}
         for name, member in members:
             if hasattr(member, "__temporal_workflow_run"):
                 seen_run_attr = True
@@ -1045,6 +1190,16 @@ def _apply_to_class(
                     )
                 else:
                     queries[query_defn.name] = query_defn
+            elif isinstance(member, UpdateMethodMultiParam):
+                update_defn = member._defn
+                if update_defn.name in updates:
+                    defn_name = update_defn.name or "<dynamic>"
+                    issues.append(
+                        f"Multiple update methods found for {defn_name} "
+                        f"(at least on {name} and {updates[update_defn.name].fn.__name__})"
+                    )
+                else:
+                    updates[update_defn.name] = update_defn
 
         # Check base classes haven't defined things with different decorators
         for base_cls in inspect.getmro(cls)[1:]:
@@ -1078,6 +1233,12 @@ def _apply_to_class(
                         issues.append(
                             f"@workflow.query defined on {base_member.__qualname__} but not on the override"
                         )
+                elif isinstance(base_member, UpdateMethodMultiParam):
+                    update_defn = base_member._defn
+                    if update_defn.name not in updates:
+                        issues.append(
+                            f"@workflow.update defined on {base_member.__qualname__} but not on the override"
+                        )
 
         if not seen_run_attr:
             issues.append("Missing @workflow.run method")
@@ -1095,6 +1256,7 @@ def _apply_to_class(
             run_fn=run_fn,
             signals=signals,
             queries=queries,
+            updates=updates,
             sandboxed=sandboxed,
         )
         setattr(cls, "__temporal_workflow_definition", defn)
@@ -1137,9 +1299,9 @@ async def with_object(*args, **kwargs) -> Any:
 def _assert_dynamic_handler_args(
     fn: Callable, arg_types: Optional[List[Type]], is_method: bool
 ) -> bool:
-    # Dynamic query/signal must have three args: self, name, and
-    # Sequence[RawValue]. An older form accepted varargs for the third param so
-    # we will too (but will warn in the signal/query code)
+    # Dynamic query/signal/update must have three args: self, name, and
+    # Sequence[RawValue]. An older form accepted varargs for the third param for signals/queries so
+    # we will too (but will warn in the signal/query code).
     params = list(inspect.signature(fn).parameters.values())
     total_expected_params = 3 if is_method else 2
     if (
@@ -1242,6 +1404,45 @@ def bind_fn(self, obj: Any) -> Callable[..., Any]:
         return _bind_method(obj, self.fn)
 
 
+@dataclass(frozen=True)
+class _UpdateDefinition:
+    # None if dynamic
+    name: Optional[str]
+    fn: Callable[..., Union[Any, Awaitable[Any]]]
+    is_method: bool
+    # Types loaded on post init if None
+    arg_types: Optional[List[Type]] = None
+    ret_type: Optional[Type] = None
+    validator: Optional[Callable[..., None]] = None
+    dynamic_vararg: bool = False
+
+    def __post_init__(self) -> None:
+        if self.arg_types is None:
+            arg_types, ret_type = temporalio.common._type_hints_from_func(self.fn)
+            # Disallow dynamic varargs
+            if not self.name and not _assert_dynamic_handler_args(
+                self.fn, arg_types, self.is_method
+            ):
+                raise RuntimeError(
+                    "Dynamic updates do not support a vararg third param, use Sequence[RawValue]",
+                )
+            object.__setattr__(self, "arg_types", arg_types)
+            object.__setattr__(self, "ret_type", ret_type)
+
+    def bind_fn(self, obj: Any) -> Callable[..., Any]:
+        return _bind_method(obj, self.fn)
+
+    def bind_validator(self, obj: Any) -> Callable[..., Any]:
+        if self.validator is not None:
+            return _bind_method(obj, self.validator)
+        return lambda *args, **kwargs: None
+
+    def set_validator(self, validator: Callable[..., None]) -> None:
+        if self.validator:
+            raise RuntimeError(f"Validator already set for update {self.name}")
+        object.__setattr__(self, "validator", validator)
+
+
 # See https://mypy.readthedocs.io/en/latest/runtime_troubles.html#using-classes-that-are-generic-in-stubs-but-not-at-runtime
 if TYPE_CHECKING:
 
@@ -3948,6 +4149,64 @@ def set_dynamic_query_handler(handler: Optional[Callable]) -> None:
     _Runtime.current().workflow_set_query_handler(None, handler)
 
 
+def get_update_handler(name: str) -> Optional[Callable]:
+    """Get the update handler for the given name if any.
+
+    This includes handlers created via the ``@workflow.update`` decorator.
+
+    Args:
+        name: Name of the update.
+
+    Returns:
+        Callable for the update if any. If a handler is not found for the name,
+        this will not return the dynamic handler even if there is one.
+    """
+    return _Runtime.current().workflow_get_update_handler(name)
+
+
+def set_update_handler(
+    name: str, handler: Optional[Callable], *, validator: Optional[Callable] = None
+) -> None:
+    """Set or unset the update handler for the given name.
+
+    This overrides any existing handlers for the given name, including handlers
+    created via the ``@workflow.update`` decorator.
+
+    Args:
+        name: Name of the update.
+        handler: Callable to set or None to unset.
+        validator: Callable to set or None to unset as the update validator.
+    """
+    _Runtime.current().workflow_set_update_handler(name, handler, validator)
+
+
+def get_dynamic_update_handler() -> Optional[Callable]:
+    """Get the dynamic update handler if any.
+
+    This includes dynamic handlers created via the ``@workflow.update``
+    decorator.
+
+    Returns:
+        Callable for the dynamic update handler if any.
+    """
+    return _Runtime.current().workflow_get_update_handler(None)
+
+
+def set_dynamic_update_handler(
+    handler: Optional[Callable], *, validator: Optional[Callable] = None
+) -> None:
+    """Set or unset the dynamic update handler.
+
+    This overrides the existing dynamic handler even if it was created via the
+    ``@workflow.update`` decorator.
+
+    Args:
+        handler: Callable to set or None to unset.
+        validator: Callable to set or None to unset as the update validator.
+    """
+    _Runtime.current().workflow_set_update_handler(None, handler, validator)
+
+
 def _is_unbound_method_on_cls(fn: Callable[..., Any], cls: Type) -> bool:
     # Python 3 does not make this easy, ref https://stackoverflow.com/questions/3589311
     return (
diff --git a/tests/contrib/test_opentelemetry.py b/tests/contrib/test_opentelemetry.py
index 22bd8fbf..e9969aa8 100644
--- a/tests/contrib/test_opentelemetry.py
+++ b/tests/contrib/test_opentelemetry.py
@@ -19,7 +19,7 @@
 from temporalio.contrib.opentelemetry import TracingInterceptor
 from temporalio.contrib.opentelemetry import workflow as otel_workflow
 from temporalio.testing import WorkflowEnvironment
-from temporalio.worker import Worker
+from temporalio.worker import UnsandboxedWorkflowRunner, Worker
 
 
 @dataclass
@@ -48,6 +48,7 @@ class TracingWorkflowAction:
     activity: Optional[TracingWorkflowActionActivity] = None
     continue_as_new: Optional[TracingWorkflowActionContinueAsNew] = None
     wait_until_signal_count: int = 0
+    wait_and_do_update: bool = False
 
 
 @dataclass
@@ -71,10 +72,14 @@ class TracingWorkflowActionContinueAsNew:
     param: TracingWorkflowParam
 
 
+ready_for_update: asyncio.Semaphore
+
+
 @workflow.defn
 class TracingWorkflow:
     def __init__(self) -> None:
         self._signal_count = 0
+        self._did_update = False
 
     @workflow.run
     async def run(self, param: TracingWorkflowParam) -> None:
@@ -126,6 +131,9 @@ async def run(self, param: TracingWorkflowParam) -> None:
                 await workflow.wait_condition(
                     lambda: self._signal_count >= action.wait_until_signal_count
                 )
+            if action.wait_and_do_update:
+                ready_for_update.release()
+                await workflow.wait_condition(lambda: self._did_update)
 
     async def _raise_on_non_replay(self) -> None:
         replaying = workflow.unsafe.is_replaying()
@@ -143,6 +151,14 @@ def query(self) -> str:
     def signal(self) -> None:
         self._signal_count += 1
 
+    @workflow.update
+    def update(self) -> None:
+        self._did_update = True
+
+    @update.validator
+    def update_validator(self) -> None:
+        pass
+
 
 async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
     # TODO(cretz): Fix
@@ -150,6 +166,8 @@ async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
         pytest.skip(
             "Java test server: https://github.com/temporalio/sdk-java/issues/1424"
         )
+    global ready_for_update
+    ready_for_update = asyncio.Semaphore(0)
     # Create a tracer that has an in-memory exporter
     exporter = InMemorySpanExporter()
     provider = TracerProvider()
@@ -166,6 +184,8 @@ async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
         task_queue=task_queue,
         workflows=[TracingWorkflow],
         activities=[tracing_activity],
+        # Needed so we can wait to send update at the right time
+        workflow_runner=UnsandboxedWorkflowRunner(),
     ):
         # Run workflow with various actions
         workflow_id = f"workflow_{uuid.uuid4()}"
@@ -184,6 +204,8 @@ async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
                             fail_on_non_replay_before_complete=True,
                         ),
                     ),
+                    # Wait for update
+                    TracingWorkflowAction(wait_and_do_update=True),
                     # Exec child workflow that fails task before complete
                     TracingWorkflowAction(
                         child_workflow=TracingWorkflowActionChildWorkflow(
@@ -230,6 +252,10 @@ async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
         # Send query, then signal to move it along
         assert "some query" == await handle.query(TracingWorkflow.query)
         await handle.signal(TracingWorkflow.signal)
+        # Wait to send the update until after the things that fail tasks are over, as failing a task while the update
+        # is running can mean we execute it twice, which will mess up our spans.
+        async with ready_for_update:
+            await handle.execute_update(TracingWorkflow.update)
         await handle.result()
 
     # Dump debug with attributes, but do string assertion test without
@@ -245,6 +271,8 @@ async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
         "  StartActivity:tracing_activity",
         "    RunActivity:tracing_activity",
         "    RunActivity:tracing_activity",
+        "  ValidateUpdate:update (links: StartWorkflowUpdate:update)",
+        "  HandleUpdate:update (links: StartWorkflowUpdate:update)",
         "  StartChildWorkflow:TracingWorkflow",
         "    RunWorkflow:TracingWorkflow",
         "    MyCustomSpan",
@@ -263,6 +291,7 @@ async def test_opentelemetry_tracing(client: Client, env: WorkflowEnvironment):
         "QueryWorkflow:query",
         "  HandleQuery:query (links: StartWorkflow:TracingWorkflow)",
         "SignalWorkflow:signal",
+        "StartWorkflowUpdate:update",
     ]
 
 
diff --git a/tests/test_client.py b/tests/test_client.py
index 5760f7a6..1772cc51 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -36,6 +36,7 @@
     Client,
     Interceptor,
     OutboundInterceptor,
+    PollWorkflowUpdateInput,
     QueryWorkflowInput,
     RPCError,
     RPCStatusCode,
@@ -55,6 +56,7 @@
     ScheduleUpdateInput,
     SignalWorkflowInput,
     StartWorkflowInput,
+    StartWorkflowUpdateInput,
     TaskReachabilityType,
     TerminateWorkflowInput,
     WorkflowContinuedAsNewError,
@@ -63,6 +65,7 @@
     WorkflowHandle,
     WorkflowQueryFailedError,
     WorkflowQueryRejectedError,
+    WorkflowUpdateHandle,
     _history_from_json,
 )
 from temporalio.common import RetryPolicy
@@ -447,6 +450,18 @@ async def terminate_workflow(self, input: TerminateWorkflowInput) -> None:
         self._parent.traces.append(("terminate_workflow", input))
         return await super().terminate_workflow(input)
 
+    async def start_workflow_update(
+        self, input: StartWorkflowUpdateInput
+    ) -> WorkflowUpdateHandle[Any]:
+        self._parent.traces.append(("start_workflow_update", input))
+        return await super().start_workflow_update(input)
+
+    async def poll_workflow_update(
+        self, input: PollWorkflowUpdateInput
+    ) -> WorkflowUpdateHandle[Any]:
+        self._parent.traces.append(("poll_workflow_update", input))
+        return await super().poll_workflow_update(input)
+
 
 async def test_interceptor(client: Client, worker: ExternalWorker):
     # Create new client from existing client but with a tracing interceptor
diff --git a/tests/test_workflow.py b/tests/test_workflow.py
index 3f24d530..f37a7374 100644
--- a/tests/test_workflow.py
+++ b/tests/test_workflow.py
@@ -19,6 +19,10 @@ def base_signal(self):
     def base_query(self):
         pass
 
+    @workflow.update
+    def base_update(self):
+        pass
+
 
 @workflow.defn(name="workflow-custom")
 class GoodDefn(GoodDefnBase):
@@ -50,6 +54,18 @@ def query2(self):
     def query3(self, name: str, args: Sequence[RawValue]):
         pass
 
+    @workflow.update
+    def update1(self):
+        pass
+
+    @workflow.update(name="update-custom")
+    def update2(self):
+        pass
+
+    @workflow.update(dynamic=True)
+    def update3(self, name: str, args: Sequence[RawValue]):
+        pass
+
 
 def test_workflow_defn_good():
     # Although the API is internal, we want to check the literal definition just
@@ -87,6 +103,20 @@ def test_workflow_defn_good():
                 name="base_query", fn=GoodDefnBase.base_query, is_method=True
             ),
         },
+        updates={
+            "update1": workflow._UpdateDefinition(
+                name="update1", fn=GoodDefn.update1, is_method=True
+            ),
+            "update-custom": workflow._UpdateDefinition(
+                name="update-custom", fn=GoodDefn.update2, is_method=True
+            ),
+            None: workflow._UpdateDefinition(
+                name=None, fn=GoodDefn.update3, is_method=True
+            ),
+            "base_update": workflow._UpdateDefinition(
+                name="base_update", fn=GoodDefnBase.base_update, is_method=True
+            ),
+        },
         sandboxed=True,
     )
 
@@ -100,6 +130,10 @@ def base_signal(self):
     def base_query(self):
         pass
 
+    @workflow.update
+    def base_update(self):
+        pass
+
 
 class BadDefn(BadDefnBase):
     # Intentionally missing @workflow.run
@@ -144,12 +178,24 @@ def query4(self, name: str, args: Sequence[RawValue]):
     def base_query(self):
         pass
 
+    @workflow.update
+    def update1(self, arg1: str):
+        pass
+
+    @workflow.update(name="update1")
+    def update2(self, arg1: str):
+        pass
+
+    # Intentionally missing decorator
+    def base_update(self):
+        pass
+
 
 def test_workflow_defn_bad():
     with pytest.raises(ValueError) as err:
         workflow.defn(BadDefn)
 
-    assert "Invalid workflow class for 7 reasons" in str(err.value)
+    assert "Invalid workflow class for 9 reasons" in str(err.value)
     assert "Missing @workflow.run method" in str(err.value)
     assert (
         "Multiple signal methods found for signal1 (at least on signal2 and signal1)"
@@ -175,6 +221,14 @@ def test_workflow_defn_bad():
         "@workflow.query defined on BadDefnBase.base_query but not on the override"
         in str(err.value)
     )
+    assert (
+        "Multiple update methods found for update1 (at least on update2 and update1)"
+        in str(err.value)
+    )
+    assert (
+        "@workflow.update defined on BadDefnBase.base_update but not on the override"
+        in str(err.value)
+    )
 
 
 def test_workflow_defn_local_class():
diff --git a/tests/worker/test_interceptor.py b/tests/worker/test_interceptor.py
index 31ed3e9a..a9e726d5 100644
--- a/tests/worker/test_interceptor.py
+++ b/tests/worker/test_interceptor.py
@@ -6,7 +6,8 @@
 import pytest
 
 from temporalio import activity, workflow
-from temporalio.client import Client
+from temporalio.client import Client, WorkflowUpdateFailedError
+from temporalio.exceptions import ApplicationError
 from temporalio.testing import WorkflowEnvironment
 from temporalio.worker import (
     ActivityInboundInterceptor,
@@ -16,6 +17,7 @@
     ExecuteWorkflowInput,
     HandleQueryInput,
     HandleSignalInput,
+    HandleUpdateInput,
     Interceptor,
     SignalChildWorkflowInput,
     SignalExternalWorkflowInput,
@@ -78,6 +80,14 @@ async def handle_query(self, input: HandleQueryInput) -> Any:
         interceptor_traces.append(("workflow.query", input))
         return await super().handle_query(input)
 
+    def handle_update_validator(self, input: HandleUpdateInput) -> None:
+        interceptor_traces.append(("workflow.update.validator", input))
+        return super().handle_update_validator(input)
+
+    async def handle_update_handler(self, input: HandleUpdateInput) -> Any:
+        interceptor_traces.append(("workflow.update.handler", input))
+        return await super().handle_update_handler(input)
+
 
 class TracingWorkflowOutboundInterceptor(WorkflowOutboundInterceptor):
     def continue_as_new(self, input: ContinueAsNewInput) -> NoReturn:
@@ -167,6 +177,19 @@ def query(self, param: str) -> str:
     def signal(self, param: str) -> None:
         self.finish.set()
 
+    @workflow.update
+    def update(self, param: str) -> str:
+        return f"update: {param}"
+
+    @workflow.update
+    def update_validated(self, param: str) -> str:
+        return f"update: {param}"
+
+    @update_validated.validator
+    def update_validated_validator(self, param: str) -> None:
+        if param == "reject-me":
+            raise ApplicationError("Invalid update")
+
 
 async def test_worker_interceptor(client: Client, env: WorkflowEnvironment):
     # TODO(cretz): Fix
@@ -193,6 +216,13 @@ async def test_worker_interceptor(client: Client, env: WorkflowEnvironment):
             InterceptedWorkflow.query, "query-val"
         )
         await handle.signal(InterceptedWorkflow.signal, "signal-val")
+        assert "update: update-val" == await handle.execute_update(
+            InterceptedWorkflow.update, "update-val"
+        )
+        with pytest.raises(WorkflowUpdateFailedError) as _err:
+            await handle.execute_update(
+                InterceptedWorkflow.update_validated, "reject-me"
+            )
         await handle.result()
 
         # Check traces
@@ -246,5 +276,10 @@ def pop_trace(name: str, filter: Optional[Callable[[Any], bool]] = None) -> Any:
         assert pop_trace(
             "workflow.signal", lambda v: v.args[0] == "external-signal-val"
         )
+        assert pop_trace("workflow.update.handler", lambda v: v.args[0] == "update-val")
+        assert pop_trace(
+            "workflow.update.validator", lambda v: v.args[0] == "reject-me"
+        )
+
         # Confirm no unexpected traces
         assert not interceptor_traces
diff --git a/tests/worker/test_workflow.py b/tests/worker/test_workflow.py
index 666863e2..6ead6f17 100644
--- a/tests/worker/test_workflow.py
+++ b/tests/worker/test_workflow.py
@@ -49,6 +49,7 @@
     WorkflowFailureError,
     WorkflowHandle,
     WorkflowQueryFailedError,
+    WorkflowUpdateFailedError,
 )
 from temporalio.common import RawValue, RetryPolicy, SearchAttributes
 from temporalio.converter import (
@@ -3503,3 +3504,242 @@ async def test_workflow_buffered_metrics(client: Client):
         and update.value == 1
         for update in updates
     )
+
+
+bad_validator_fail_ct = 0
+task_fail_ct = 0
+
+
+@workflow.defn
+class UpdateHandlersWorkflow:
+    def __init__(self) -> None:
+        self._last_event: Optional[str] = None
+
+    @workflow.run
+    async def run(self) -> None:
+        workflow.set_update_handler("first_task_update", lambda: "worked")
+
+        # Wait forever
+        await asyncio.Future()
+
+    @workflow.update
+    def last_event(self, an_arg: str) -> str:
+        if an_arg == "fail":
+            raise ApplicationError("SyncFail")
+        le = self._last_event or "<no event>"
+        self._last_event = an_arg
+        return le
+
+    @last_event.validator
+    def last_event_validator(self, an_arg: str) -> None:
+        workflow.logger.info("Running validator with arg %s", an_arg)
+        if an_arg == "reject_me":
+            raise ApplicationError("Rejected")
+
+    @workflow.update
+    async def last_event_async(self, an_arg: str) -> str:
+        await asyncio.sleep(1)
+        if an_arg == "fail":
+            raise ApplicationError("AsyncFail")
+        le = self._last_event or "<no event>"
+        self._last_event = an_arg
+        return le
+
+    @workflow.update
+    async def runs_activity(self, name: str) -> str:
+        act = workflow.start_activity(
+            say_hello, name, schedule_to_close_timeout=timedelta(seconds=5)
+        )
+        act.cancel()
+        await act
+        return "done"
+
+    @workflow.update(name="renamed")
+    async def async_named(self) -> str:
+        return "named"
+
+    @workflow.update
+    async def bad_validator(self) -> str:
+        return "done"
+
+    @bad_validator.validator
+    def bad_validator_validator(self) -> None:
+        global bad_validator_fail_ct
+        # Run a command which should not be allowed the first few tries, then "fix" it as if new code was deployed
+        if bad_validator_fail_ct < 2:
+            bad_validator_fail_ct += 1
+            workflow.start_activity(
+                say_hello, "boo", schedule_to_close_timeout=timedelta(seconds=5)
+            )
+
+    @workflow.update
+    async def set_dynamic(self) -> str:
+        def dynahandler(name: str, _args: Sequence[RawValue]) -> str:
+            return "dynahandler - " + name
+
+        def dynavalidator(name: str, _args: Sequence[RawValue]) -> None:
+            if name == "reject_me":
+                raise ApplicationError("Rejected")
+
+        workflow.set_dynamic_update_handler(dynahandler, validator=dynavalidator)
+        return "set"
+
+    @workflow.update
+    def throws_runtime_err(self) -> None:
+        global task_fail_ct
+        if task_fail_ct < 1:
+            task_fail_ct += 1
+            raise RuntimeError("intentional failure")
+
+
+async def test_workflow_update_handlers_happy(client: Client, env: WorkflowEnvironment):
+    if env.supports_time_skipping:
+        pytest.skip(
+            "Java test server: https://github.com/temporalio/sdk-java/issues/1903"
+        )
+    async with new_worker(
+        client, UpdateHandlersWorkflow, activities=[say_hello]
+    ) as worker:
+        wf_id = f"update-handlers-workflow-{uuid.uuid4()}"
+        handle = await client.start_workflow(
+            UpdateHandlersWorkflow.run,
+            id=wf_id,
+            task_queue=worker.task_queue,
+        )
+
+        # Dynamically registered and used in first task
+        assert "worked" == await handle.execute_update("first_task_update")
+
+        # Normal handling
+        last_event = await handle.execute_update(
+            UpdateHandlersWorkflow.last_event, "val2"
+        )
+        assert "<no event>" == last_event
+
+        # Async handler
+        last_event = await handle.execute_update(
+            UpdateHandlersWorkflow.last_event_async, "val3"
+        )
+        assert "val2" == last_event
+
+        # Dynamic handler
+        await handle.execute_update(UpdateHandlersWorkflow.set_dynamic)
+        assert "dynahandler - made_up" == await handle.execute_update("made_up")
+
+        # Name overload
+        assert "named" == await handle.execute_update(
+            UpdateHandlersWorkflow.async_named
+        )
+
+        # Get untyped handle
+        assert "val3" == await client.get_workflow_handle(wf_id).execute_update(
+            UpdateHandlersWorkflow.last_event, "val4"
+        )
+
+
+async def test_workflow_update_handlers_unhappy(
+    client: Client, env: WorkflowEnvironment
+):
+    if env.supports_time_skipping:
+        pytest.skip(
+            "Java test server: https://github.com/temporalio/sdk-java/issues/1903"
+        )
+    async with new_worker(client, UpdateHandlersWorkflow) as worker:
+        handle = await client.start_workflow(
+            UpdateHandlersWorkflow.run,
+            id=f"update-handlers-workflow-unhappy-{uuid.uuid4()}",
+            task_queue=worker.task_queue,
+        )
+
+        # Undefined handler
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update("whargarbl", "whatever")
+        assert isinstance(err.value.cause, ApplicationError)
+        assert "'whargarbl' expected but not found" in err.value.cause.message
+        assert (
+            "known updates: [bad_validator first_task_update last_event last_event_async renamed runs_activity set_dynamic throws_runtime_err]"
+            in err.value.cause.message
+        )
+
+        # Rejection by validator
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update(UpdateHandlersWorkflow.last_event, "reject_me")
+        assert isinstance(err.value.cause, ApplicationError)
+        assert "Rejected" == err.value.cause.message
+
+        # Failure during update handler
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update(UpdateHandlersWorkflow.last_event, "fail")
+        assert isinstance(err.value.cause, ApplicationError)
+        assert "SyncFail" == err.value.cause.message
+
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update(UpdateHandlersWorkflow.last_event_async, "fail")
+        assert isinstance(err.value.cause, ApplicationError)
+        assert "AsyncFail" == err.value.cause.message
+
+        # Cancel inside handler
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update(UpdateHandlersWorkflow.runs_activity, "foo")
+        assert isinstance(err.value.cause, CancelledError)
+
+        # Incorrect args for handler
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update("last_event", args=[121, "badarg"])
+        assert isinstance(err.value.cause, ApplicationError)
+        assert (
+            "last_event_validator() takes 2 positional arguments but 3 were given"
+            in err.value.cause.message
+        )
+
+        # Un-deserializeable nonsense
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update(
+                "last_event",
+                arg=RawValue(
+                    payload=Payload(
+                        metadata={"encoding": b"u-dont-know-me"}, data=b"enchi-cat"
+                    )
+                ),
+            )
+        assert isinstance(err.value.cause, ApplicationError)
+        assert "Failed decoding arguments" == err.value.cause.message
+
+        # Dynamic handler
+        await handle.execute_update(UpdateHandlersWorkflow.set_dynamic)
+
+        # Rejection by dynamic handler validator
+        with pytest.raises(WorkflowUpdateFailedError) as err:
+            await handle.execute_update("reject_me")
+        assert isinstance(err.value.cause, ApplicationError)
+        assert "Rejected" == err.value.cause.message
+
+
+async def test_workflow_update_task_fails(client: Client, env: WorkflowEnvironment):
+    if env.supports_time_skipping:
+        pytest.skip(
+            "Java test server: https://github.com/temporalio/sdk-java/issues/1903"
+        )
+    # Need to not sandbox so behavior can change based on globals
+    async with new_worker(
+        client, UpdateHandlersWorkflow, workflow_runner=UnsandboxedWorkflowRunner()
+    ) as worker:
+        handle = await client.start_workflow(
+            UpdateHandlersWorkflow.run,
+            id=f"update-handlers-command-in-validator-{uuid.uuid4()}",
+            task_queue=worker.task_queue,
+            task_timeout=timedelta(seconds=1),
+        )
+
+        # This will produce a WFT failure which will eventually resolve and then this
+        # update will return
+        res = await handle.execute_update(UpdateHandlersWorkflow.bad_validator)
+        assert res == "done"
+
+        # Non-temporal failure should cause task failure in update handler
+        await handle.execute_update(UpdateHandlersWorkflow.throws_runtime_err)
+
+        # Verify task failures did happen
+        global task_fail_ct, bad_validator_fail_ct
+        assert task_fail_ct == 1
+        assert bad_validator_fail_ct == 2