From e6de815a74b3009b0e86f8605edff6401b7a8337 Mon Sep 17 00:00:00 2001
From: Md Junaed Hossain <169046794+junaed-optimizely@users.noreply.github.com>
Date: Fri, 18 Sep 2026 15:12:21 +0600
Subject: [PATCH 1/2] [FSSDK-13110] patch release

---
 CHANGELOG.md             | 8 ++++++++
 lib/utils/enums/index.ts | 2 +-
 package-lock.json        | 4 ++--
 package.json             | 2 +-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ebb868e7..1848e3028 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [6.6.1] - September 18, 2026
+
+### Bug Fixes
+- Use a versioned datafile cache key so the SDK no longer reads a stale or malformed datafile persisted by an older SDK version ([#1175](https://github.com/optimizely/javascript-sdk/pull/1175))
+
+### Changed
+- Refactor cache and event store to operate on serialized string values, centralizing JSON serialization in the prefix stores ([#1175](https://github.com/optimizely/javascript-sdk/pull/1175))
+
 ## [6.6.0] - September 3, 2026
 
 ### New Features
diff --git a/lib/utils/enums/index.ts b/lib/utils/enums/index.ts
index 4410ff6c1..202c74b4a 100644
--- a/lib/utils/enums/index.ts
+++ b/lib/utils/enums/index.ts
@@ -44,7 +44,7 @@ export const CONTROL_ATTRIBUTES = {
 export const JAVASCRIPT_CLIENT_ENGINE = 'javascript-sdk';
 export const NODE_CLIENT_ENGINE = 'node-sdk';
 export const REACT_NATIVE_JS_CLIENT_ENGINE = 'react-native-js-sdk';
-export const CLIENT_VERSION = '6.6.0';
+export const CLIENT_VERSION = '6.6.1';
 
 /*
  * Represents the source of a decision for feature management. When a feature
diff --git a/package-lock.json b/package-lock.json
index 4f1363743..7d33da914 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "6.6.0",
+  "version": "6.6.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@optimizely/optimizely-sdk",
-      "version": "6.6.0",
+      "version": "6.6.1",
       "license": "Apache-2.0",
       "dependencies": {
         "decompress-response": "^7.0.0",
diff --git a/package.json b/package.json
index eaeddfa84..714dad1bb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "6.6.0",
+  "version": "6.6.1",
   "description": "JavaScript SDK for Optimizely Feature Experimentation, Optimizely Full Stack (legacy), and Optimizely Rollouts",
   "main": "./dist/index.node.min.js",
   "browser": "./dist/index.browser.es.min.js",

From 1480f9438207cb9545b59b2abc6375009324be38 Mon Sep 17 00:00:00 2001
From: Md Junaed Hossain <169046794+junaed-optimizely@users.noreply.github.com>
Date: Fri, 18 Sep 2026 16:55:46 +0600
Subject: [PATCH 2/2] [FSSDK-13110] review feedback

---
 CHANGELOG.md | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1848e3028..5a8d206f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,10 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [6.6.1] - September 18, 2026
 
 ### Bug Fixes
-- Use a versioned datafile cache key so the SDK no longer reads a stale or malformed datafile persisted by an older SDK version ([#1175](https://github.com/optimizely/javascript-sdk/pull/1175))
-
-### Changed
-- Refactor cache and event store to operate on serialized string values, centralizing JSON serialization in the prefix stores ([#1175](https://github.com/optimizely/javascript-sdk/pull/1175))
+- Use an updated datafile cache key so the SDK no longer reads a stale or malformed datafile persisted by an older SDK version ([#1175](https://github.com/optimizely/javascript-sdk/pull/1175))
 
 ## [6.6.0] - September 3, 2026