diff --git a/setup.py b/setup.py
index 16f77a4..ab70b65 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
     sys.exit('Sorry, only python 2.6 or 2.7 is supported')
 
 setup(name='qcloud_cos_v4',
-      version='0.0.20',
+      version='0.0.21',
       description='python sdk for tencent qcloud cos v4.0',
       long_description=open('README.rst', 'r').read(),
       license='MIT License',