diff --git a/CHANGELOG.md b/CHANGELOG.md
index db6a98cc..e0ca5d5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,23 @@
 # Optimizely PHP SDK Changelog
 
+## 3.8.0
+September 16th, 2021
+
+### New Features:
+- Add new public properties to `OptimizelyConfig`. ([#230](https://github.com/optimizely/php-sdk/pull/230))
+	- sdkKey
+	- environmentKey
+	- attributes
+	- audiences
+	- events
+	- experimentRules and deliveryRules to `OptimizelyFeature`
+	- audiences to `OptimizelyExperiment`
+- For details, refer to our documentation page: [https://docs.developers.optimizely.com/full-stack/v4.0/docs/optimizelyconfig-php](https://docs.developers.optimizely.com/full-stack/v4.0/docs/optimizelyconfig-php).
+
+### Deprecated:
+- `OptimizelyFeature.experimentsMap` of `OptimizelyConfig` is deprecated as of this release. Please use `OptimizelyFeature.experimentRules` and `OptimizelyFeature.deliveryRules`. ([#230](https://github.com/optimizely/php-sdk/pull/230))
+
+
 ## 3.7.1
 August 4th, 2021
 
diff --git a/src/Optimizely/Event/Builder/EventBuilder.php b/src/Optimizely/Event/Builder/EventBuilder.php
index 4f7bd926..8f2144cb 100644
--- a/src/Optimizely/Event/Builder/EventBuilder.php
+++ b/src/Optimizely/Event/Builder/EventBuilder.php
@@ -38,7 +38,7 @@ class EventBuilder
     /**
      * @const string Version of the Optimizely PHP SDK.
      */
-    const SDK_VERSION = '3.7.1';
+    const SDK_VERSION = '3.8.0';
 
     /**
      * @var string URL to send event to.
diff --git a/tests/EventTests/EventBuilderTest.php b/tests/EventTests/EventBuilderTest.php
index 4c6d6126..9dd4e79c 100644
--- a/tests/EventTests/EventBuilderTest.php
+++ b/tests/EventTests/EventBuilderTest.php
@@ -68,7 +68,7 @@ public function setUp()
                 ]],
                 'revision' => '15',
                 'client_name' => 'php-sdk',
-                'client_version' => '3.7.1',
+                'client_version' => '3.8.0',
                 'anonymize_ip'=> false,
                 'enrich_decisions' => true,
             ];