diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 35bd5c50..0be28311 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
-  "ucan": "0.3.2",
-  "ucan-key-support": "0.1.6"
+  "ucan": "0.4.0",
+  "ucan-key-support": "0.1.7"
 }
diff --git a/ucan-key-support/CHANGELOG.md b/ucan-key-support/CHANGELOG.md
index 1893bed5..43566890 100644
--- a/ucan-key-support/CHANGELOG.md
+++ b/ucan-key-support/CHANGELOG.md
@@ -16,6 +16,10 @@
   * dependencies
     * ucan bumped from 0.3.1 to 0.3.2
 
+* The following workspace dependencies were updated
+  * dependencies
+    * ucan bumped from 0.3.2 to 0.4.0
+
 ## [0.1.2](https://github.com/ucan-wg/rs-ucan/compare/ucan-key-support-v0.1.1...ucan-key-support-v0.1.2) (2023-04-22)
 
 
diff --git a/ucan-key-support/Cargo.toml b/ucan-key-support/Cargo.toml
index 9fb437c9..e8cbe332 100644
--- a/ucan-key-support/Cargo.toml
+++ b/ucan-key-support/Cargo.toml
@@ -14,7 +14,7 @@ repository = "https://github.com/cdata/rs-ucan/"
 homepage = "https://github.com/cdata/rs-ucan"
 license = "Apache-2.0"
 readme = "README.md"
-version = "0.1.6"
+version = "0.1.7"
 
 [features]
 default = []
@@ -28,7 +28,7 @@ log = "0.4"
 rsa = "0.9"
 p256 = "0.13"
 sha2 = { version = "0.10", features = ["oid"] }
-ucan = { path = "../ucan", version = "0.3.2" }
+ucan = { path = "../ucan", version = "0.4.0" }
 
 [build-dependencies]
 npm_rs = "1.0"
diff --git a/ucan/CHANGELOG.md b/ucan/CHANGELOG.md
index 0b8f8a64..6385fa94 100644
--- a/ucan/CHANGELOG.md
+++ b/ucan/CHANGELOG.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## [0.4.0](https://github.com/ucan-wg/rs-ucan/compare/ucan-v0.3.2...ucan-v0.4.0) (2023-06-27)
+
+
+### ⚠ BREAKING CHANGES
+
+* Update capabilites in line with UCAN 0.9/0.10 specs ([#105](https://github.com/ucan-wg/rs-ucan/issues/105))
+* Update `fct`/`ucv` layout for 0.10.0 spec ([#108](https://github.com/ucan-wg/rs-ucan/issues/108))
+* Support generic hashers in `UcanBuilder` and `ProofChain`. ([#89](https://github.com/ucan-wg/rs-ucan/issues/89))
+
+### Features
+
+* Allow nullable expiry, per 0.9.0 spec. Fixes [#23](https://github.com/ucan-wg/rs-ucan/issues/23) ([#95](https://github.com/ucan-wg/rs-ucan/issues/95)) ([12d4756](https://github.com/ucan-wg/rs-ucan/commit/12d475606da940b64654f17807adf592551982d0))
+* Support generic hashers in `UcanBuilder` and `ProofChain`. ([#89](https://github.com/ucan-wg/rs-ucan/issues/89)) ([e057f87](https://github.com/ucan-wg/rs-ucan/commit/e057f87c7b278d18e77b1d3d213656d18b1a2fee))
+* Update `fct`/`ucv` layout for 0.10.0 spec ([#108](https://github.com/ucan-wg/rs-ucan/issues/108)) ([ae19741](https://github.com/ucan-wg/rs-ucan/commit/ae197415048da201f7d75bf08cdb010b4f657895))
+* Update capabilites in line with UCAN 0.9/0.10 specs ([#105](https://github.com/ucan-wg/rs-ucan/issues/105)) ([0bdf98f](https://github.com/ucan-wg/rs-ucan/commit/0bdf98f9043e753026711fb19449ab0bc6d87fc7))
+
 ## [0.3.2](https://github.com/ucan-wg/rs-ucan/compare/ucan-v0.3.1...ucan-v0.3.2) (2023-05-25)
 
 
diff --git a/ucan/Cargo.toml b/ucan/Cargo.toml
index 7f93bf8e..79967795 100644
--- a/ucan/Cargo.toml
+++ b/ucan/Cargo.toml
@@ -13,7 +13,7 @@ repository = "https://github.com/cdata/rs-ucan/"
 homepage = "https://github.com/cdata/rs-ucan"
 license = "Apache-2.0"
 readme = "README.md"
-version = "0.3.2"
+version = "0.4.0"
 edition = "2021"
 
 [features]