diff --git a/CHANGELOG.md b/CHANGELOG.md
index 12c5cf1..b889bbd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [6.0.0]
+### Changed
+- **BREAKING:** Use separate entrypoint for browser environments ([#49](https://github.com/MetaMask/post-message-stream/pull/49))
+  - This means `worker_threads` and `child_process` streams are no longer exposed in the browser.
+
 ## [5.1.0]
 ### Added
 - Export `BasePostMessageStream` ([#45](https://github.com/MetaMask/post-message-stream/pull/45))
@@ -53,7 +58,8 @@ 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/v5.1.0...HEAD
+[Unreleased]: https://github.com/MetaMask/post-message-stream/compare/v6.0.0...HEAD
+[6.0.0]: https://github.com/MetaMask/post-message-stream/compare/v5.1.0...v6.0.0
 [5.1.0]: https://github.com/MetaMask/post-message-stream/compare/v5.0.1...v5.1.0
 [5.0.1]: https://github.com/MetaMask/post-message-stream/compare/v5.0.0...v5.0.1
 [5.0.0]: https://github.com/MetaMask/post-message-stream/compare/v4.0.0...v5.0.0
diff --git a/package.json b/package.json
index 2c20854..bd5a9aa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@metamask/post-message-stream",
-  "version": "5.1.0",
+  "version": "6.0.0",
   "description": "Sets up a duplex object stream over window.postMessage",
   "homepage": "https://github.com/MetaMask/post-message-stream#readme",
   "bugs": {