diff --git a/CHANGELOG.md b/CHANGELOG.md
index ffe2b94..2eba401 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).
 
+## [1.3.0] - 2021-07-07
+### Added:
+- `AsyncMutex`, a simple async lock implementation for test serialization.
+
 ## [1.2.1] - 2021-06-09
 ### Fixed:
 - When generating a self-signed certificate for TLS testing, use a key size of 2048 bits (rather than 1024, the default used by the `selfsigned` module) for maximum cross-platform compatibility.
diff --git a/package-lock.json b/package-lock.json
index 04876cd..be56714 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "launchdarkly-js-test-helpers",
-  "version": "1.2.1",
+  "version": "1.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index fddcae1..09890c1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "launchdarkly-js-test-helpers",
-  "version": "1.2.1",
+  "version": "1.3.0",
   "description": "LaunchDarkly JavaScript test utilities",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",