diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b1356f2..f1c8ae5 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.8.1"
+  ".": "3.9.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d0130a..944cfbe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,15 @@
 
 All notable changes to the LaunchDarkly client-side JavaScript SDKs will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [3.9.0](https://github.com/launchdarkly/js-client-sdk/compare/3.8.1...3.9.0) (2025-09-09)
+
+
+### Features
+
+* Add experimental debug override functionality. ([9af8be9](https://github.com/launchdarkly/js-client-sdk/commit/9af8be91e2167cfd3369c0fffe0330a404cf9404))
+* Add experimental debug override functionality. ([9fcac21](https://github.com/launchdarkly/js-client-sdk/commit/9fcac210e1152160d8b940383a8a85035b06a467))
+* Add experimental debug override functionality. ([#326](https://github.com/launchdarkly/js-client-sdk/issues/326)) ([9af8be9](https://github.com/launchdarkly/js-client-sdk/commit/9af8be91e2167cfd3369c0fffe0330a404cf9404))
+
 ## [3.8.1](https://github.com/launchdarkly/js-client-sdk/compare/3.8.0...3.8.1) (2025-05-30)
 
 
diff --git a/package.json b/package.json
index 7101dff..3701134 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "launchdarkly-js-client-sdk",
-  "version": "3.8.1",
+  "version": "3.9.0",
   "description": "LaunchDarkly SDK for JavaScript",
   "author": "LaunchDarkly <team@launchdarkly.com>",
   "license": "Apache-2.0",