diff --git a/include/cos_defines.h b/include/cos_defines.h
index 2ee52a8..beaebef 100644
--- a/include/cos_defines.h
+++ b/include/cos_defines.h
@@ -12,7 +12,7 @@
 
 namespace qcloud_cos {
 
-#define COS_CPP_SDK_VERSON "v5.5.16"
+#define COS_CPP_SDK_VERSON "v5.5.17"
 
 /// 路径分隔符
 const char kPathDelimiter[] = "/";