diff --git a/CHANGELOG.md b/CHANGELOG.md
index edca829..6fcd4c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 cos-php-sdk-v5 Upgrade Guide
 ====================
+2.6.15 to 2.6.16
+---------
+1. header：x-ci-* 写入签名
+2. 补充音视频转码、创建数据集、文档异步处理任务参数
+3. 调整人脸特效功能处理detect-url公网图片链接时的请求方式
+
 2.6.14 to 2.6.15
 ---------
 1. 通过API使用极智压缩
diff --git a/src/Client.php b/src/Client.php
index 5af5d4a..40a1a2e 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -282,7 +282,7 @@
  * @see \Qcloud\Cos\Service::getService()
  */
 class Client extends GuzzleClient {
-    const VERSION = '2.6.15';
+    const VERSION = '2.6.16';
 
     public $httpClient;