diff --git a/Cargo.lock b/Cargo.lock
index 1ec4cd5..0a2763a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -506,7 +506,7 @@ dependencies = [
  "autocfg",
  "cfg-if",
  "crossbeam-utils",
- "memoffset",
+ "memoffset 0.8.0",
  "scopeguard",
 ]
 
@@ -1026,6 +1026,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "memoffset"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "minimal-lexical"
 version = "0.2.1"
@@ -1451,14 +1460,14 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.18.3"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3b1ac5b3731ba34fdaa9785f8d74d17448cd18f30cf19e0c7e7b1fdb5272109"
+checksum = "cffef52f74ec3b1a1baf295d9b8fcc3070327aefc39a6d00656b13c1d0b8885c"
 dependencies = [
  "cfg-if",
  "indoc",
  "libc",
- "memoffset",
+ "memoffset 0.9.0",
  "parking_lot 0.12.1",
  "pyo3-build-config",
  "pyo3-ffi",
@@ -1468,9 +1477,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.18.3"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9cb946f5ac61bb61a5014924910d936ebd2b23b705f7a4a3c40b05c720b079a3"
+checksum = "713eccf888fb05f1a96eb78c0dbc51907fee42b3377272dc902eb38985f418d5"
 dependencies = [
  "once_cell",
  "target-lexicon",
@@ -1478,9 +1487,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.18.3"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd4d7c5337821916ea2a1d21d1092e8443cf34879e53a0ac653fbb98f44ff65c"
+checksum = "5b2ecbdcfb01cbbf56e179ce969a048fd7305a66d4cdf3303e0da09d69afe4c3"
 dependencies = [
  "libc",
  "pyo3-build-config",
@@ -1488,9 +1497,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros"
-version = "0.18.3"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9d39c55dab3fc5a4b25bbd1ac10a2da452c4aca13bb450f22818a002e29648d"
+checksum = "b78fdc0899f2ea781c463679b20cb08af9247febc8d052de941951024cd8aea0"
 dependencies = [
  "proc-macro2",
  "pyo3-macros-backend",
@@ -1500,9 +1509,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.18.3"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97daff08a4c48320587b5224cc98d609e3c27b6d437315bd40b605c98eeb5918"
+checksum = "60da7b84f1227c3e2fe7593505de274dcf4c8928b4e0a1c23d551a14e4e80a0f"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 293c6aa..a3c62ae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,7 +41,7 @@ parity-scale-codec = { version = "3.2.1", optional = true, features = [ "max-enc
 postgres-types = { version = "0.2.3", optional = true }
 primitive-types = { version = "<1", optional = true }
 proptest = { version = "1.0", optional = true }
-pyo3 = { version = "0.18.3", optional = true }
+pyo3 = { version = "0.19.0", optional = true }
 quickcheck = { version = "1.0", optional = true }
 rand = { version = "0.8.5", optional = true }
 rlp = { version = "0.5.1", optional = true }