diff --git a/requirements.txt b/requirements.txt
index 2cf9705..dedd457 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ greenlet==0.4.12
 grpcio==1.4.0
 grpcio-tools==1.4.0
 gunicorn==19.6.0
-httplib2==0.10.3
+httplib2==0.18.0
 msgpack-python==0.4.8
 oauth2client==4.1.2
 protobuf==3.4.0