diff --git a/src/qcloud/cos/Api.php b/src/qcloud/cos/Api.php
index 435d8bb..03bc66a 100644
--- a/src/qcloud/cos/Api.php
+++ b/src/qcloud/cos/Api.php
@@ -4,7 +4,7 @@
 
 class Api {
     //版本
-    const VERSION = 'v4.3.4';
+    const VERSION = 'v4.3.5';
     //计算sign签名的时间参数
     const EXPIRED_SECONDS = 180;
     //1M