diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ca4d27442..8c1d6a1a38 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## next release
+## 3.305.9 - 2024-05-03
 
 * `Aws\` - Fixes issue with manually configured signature versions.
 * `Aws\Connect` - This release adds 5 new APIs for managing attachments: StartAttachedFileUpload, CompleteAttachedFileUpload, GetAttachedFile, BatchGetAttachedFileMetadata, DeleteAttachedFile. These APIs can be used to programmatically upload and download attachments to Connect resources, like cases.
diff --git a/src/Sdk.php b/src/Sdk.php
index d21e484940..37b146af69 100644
--- a/src/Sdk.php
+++ b/src/Sdk.php
@@ -771,7 +771,7 @@
  */
 class Sdk
 {
-    const VERSION = '3.305.8';
+    const VERSION = '3.305.9';
 
     /** @var array Arguments for creating clients */
     private $args;