diff --git a/qcloud_cos/version.py b/qcloud_cos/version.py
index 4eca7dc..32c2929 100644
--- a/qcloud_cos/version.py
+++ b/qcloud_cos/version.py
@@ -1 +1 @@
-__version__ = '5.1.9.30'
+__version__ = '5.1.9.31'
diff --git a/setup.py b/setup.py
index 6bbdab5..e34b83f 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ def long_description():
 
 setup(
     name='cos-python-sdk-v5',
-    version='1.9.30',
+    version='1.9.31',
     url='https://www.qcloud.com/',
     license='MIT',
     author='tiedu, lewzylu, channingliu',