diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3783c7650..3e669ca75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [5.2.1] - March 25, 2024
+
+### Bug fixes
+- Fix: empty segments collection is valid ([#916](https://github.com/optimizely/javascript-sdk/pull/916))
+- Update vulnerable dependencies ([#918](https://github.com/optimizely/javascript-sdk/pull/918))
+
 ## [5.2.0] - March 18, 2024
 
 ### New Features
diff --git a/lib/index.browser.tests.js b/lib/index.browser.tests.js
index 8fb71ed68..04e4a1559 100644
--- a/lib/index.browser.tests.js
+++ b/lib/index.browser.tests.js
@@ -193,7 +193,7 @@ describe('javascript-sdk (Browser)', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '5.2.0');
+        assert.equal(optlyInstance.clientVersion, '5.2.1');
       });
 
       it('should set the JavaScript client engine and version', function() {
diff --git a/lib/index.lite.tests.js b/lib/index.lite.tests.js
index 167e8aeb5..44da77f11 100644
--- a/lib/index.lite.tests.js
+++ b/lib/index.lite.tests.js
@@ -76,7 +76,7 @@ describe('optimizelyFactory', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '5.2.0');
+        assert.equal(optlyInstance.clientVersion, '5.2.1');
       });
     });
   });
diff --git a/lib/index.node.tests.js b/lib/index.node.tests.js
index 324711065..0ceed3057 100644
--- a/lib/index.node.tests.js
+++ b/lib/index.node.tests.js
@@ -90,7 +90,7 @@ describe('optimizelyFactory', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '5.2.0');
+        assert.equal(optlyInstance.clientVersion, '5.2.1');
       });
 
       describe('event processor configuration', function() {
diff --git a/lib/utils/enums/index.ts b/lib/utils/enums/index.ts
index 4b5679960..95fe4f4ed 100644
--- a/lib/utils/enums/index.ts
+++ b/lib/utils/enums/index.ts
@@ -223,7 +223,7 @@ export const NODE_CLIENT_ENGINE = 'node-sdk';
 export const REACT_CLIENT_ENGINE = 'react-sdk';
 export const REACT_NATIVE_CLIENT_ENGINE = 'react-native-sdk';
 export const REACT_NATIVE_JS_CLIENT_ENGINE = 'react-native-js-sdk';
-export const CLIENT_VERSION = '5.2.0';
+export const CLIENT_VERSION = '5.2.1';
 
 export const DECISION_NOTIFICATION_TYPES = {
   AB_TEST: 'ab-test',
diff --git a/package-lock.json b/package-lock.json
index c3271cc8f..0e90154c4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@optimizely/optimizely-sdk",
-      "version": "5.2.0",
+      "version": "5.2.1",
       "license": "Apache-2.0",
       "dependencies": {
         "decompress-response": "^4.2.1",
diff --git a/package.json b/package.json
index 40d703b3f..cd15db28b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "description": "JavaScript SDK for Optimizely Feature Experimentation, Optimizely Full Stack (legacy), and Optimizely Rollouts",
   "module": "dist/optimizely.browser.es.js",
   "main": "dist/optimizely.node.min.js",
diff --git a/tests/index.react_native.spec.ts b/tests/index.react_native.spec.ts
index 0a68676ae..afc59cc56 100644
--- a/tests/index.react_native.spec.ts
+++ b/tests/index.react_native.spec.ts
@@ -90,7 +90,7 @@ describe('javascript-sdk/react-native', () => {
 
         expect(optlyInstance).toBeInstanceOf(Optimizely);
         // @ts-ignore
-        expect(optlyInstance.clientVersion).toEqual('5.2.0');
+        expect(optlyInstance.clientVersion).toEqual('5.2.1');
       });
 
       it('should set the React Native JS client engine and javascript SDK version', () => {