diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2eba401..ecebb77 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to the package will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [1.3.1] - 2021-07-16
+### Fixed:
+- Fixed the implementation of `AsyncMutex` which was not behaving as intended when more than two tasks contended for a lock.
+
 ## [1.3.0] - 2021-07-07
 ### Added:
 - `AsyncMutex`, a simple async lock implementation for test serialization.
diff --git a/package.json b/package.json
index 09890c1..fd6dd32 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "launchdarkly-js-test-helpers",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "LaunchDarkly JavaScript test utilities",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",