diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d7eba9..09115e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 cos-php-sdk-v5 Upgrade Guide
 ====================
+2.6.11 to 2.6.12
+---------
+1. 盲水印支持版本参数
+2. 更新sts-sdk demo
+3. 压缩包预览
+4. hls加密
+5. 视频明水印
+6. 图片水印支持spacing参数
+
 2.6.10 to 2.6.11
 ---------
 1. 创建数据集
diff --git a/src/Client.php b/src/Client.php
index 9a32985..5910366 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -280,7 +280,7 @@
  * @see \Qcloud\Cos\Service::getService()
  */
 class Client extends GuzzleClient {
-    const VERSION = '2.6.11';
+    const VERSION = '2.6.12';
 
     public $httpClient;