diff --git a/qcloud_cos/cos_auth.py b/qcloud_cos/cos_auth.py
index ba05395c..30db457f 100644
--- a/qcloud_cos/cos_auth.py
+++ b/qcloud_cos/cos_auth.py
@@ -23,6 +23,7 @@ def filter_headers(data):
         "content-type",
         "expires",
         "content-md5",
+        "content-length",
         "host"
     ]
     headers = {}
diff --git a/qcloud_cos/version.py b/qcloud_cos/version.py
index 29bc8d2d..1d8b8d9e 100644
--- a/qcloud_cos/version.py
+++ b/qcloud_cos/version.py
@@ -1,2 +1,2 @@
 
-__version__ = '5.1.9.5'
+__version__ = '5.1.9.6'
diff --git a/setup.py b/setup.py
index 713c625c..9112065c 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@ def long_description():
 
 setup(
     name='cos-python-sdk-v5',
-    version='1.9.5',
+    version='1.9.6',
     url='https://www.qcloud.com/',
     license='MIT',
     author='tiedu, lewzylu, channingliu',