diff --git a/CHANGELOG.md b/CHANGELOG.md
index 053d338..8879f7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [8.1.1]
+### Changed
+- Bump `@metamask/utils` from `^8.1.0` to `^9.0.0` ([#140](https://github.com/MetaMask/post-message-stream/pull/140))
+
 ## [8.1.0]
 ### Changed
 - Support overriding default Duplex Stream options as constructor options. ([#131](https://github.com/MetaMask/post-message-stream/pull/131))
@@ -88,7 +92,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Initial release.
 
-[Unreleased]: https://github.com/MetaMask/post-message-stream/compare/v8.1.0...HEAD
+[Unreleased]: https://github.com/MetaMask/post-message-stream/compare/v8.1.1...HEAD
+[8.1.1]: https://github.com/MetaMask/post-message-stream/compare/v8.1.0...v8.1.1
 [8.1.0]: https://github.com/MetaMask/post-message-stream/compare/v8.0.0...v8.1.0
 [8.0.0]: https://github.com/MetaMask/post-message-stream/compare/v7.0.0...v8.0.0
 [7.0.0]: https://github.com/MetaMask/post-message-stream/compare/v6.2.0...v7.0.0
diff --git a/package.json b/package.json
index 8d9deb6..4965472 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@metamask/post-message-stream",
-  "version": "8.1.0",
+  "version": "8.1.1",
   "description": "Sets up a duplex object stream over window.postMessage",
   "homepage": "https://github.com/MetaMask/post-message-stream#readme",
   "bugs": {