diff --git a/qcloud_cos/version.py b/qcloud_cos/version.py
index 908203c..87ccd03 100644
--- a/qcloud_cos/version.py
+++ b/qcloud_cos/version.py
@@ -1,2 +1,2 @@
 
-__version__ = '5.1.8.9'
+__version__ = '5.1.9.0'
diff --git a/setup.py b/setup.py
index 4df70aa..d20b48d 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 from platform import python_version_tuple
-
+import io
 
 def requirements():
 
@@ -10,13 +10,13 @@ def requirements():
 
 
 def long_description():
-    with open('README.rst', 'r', encoding='utf8') as fileobj:
+    with io.open('README.rst', 'r', encoding='utf8') as fileobj:
         return fileobj.read()
 
 
 setup(
     name='cos-python-sdk-v5',
-    version='1.8.9',
+    version='1.9.0',
     url='https://www.qcloud.com/',
     license='MIT',
     author='tiedu, lewzylu, channingliu',