diff --git a/requirements.txt b/requirements.txt
index a43f495..dc70b29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ googleapis-common-protos==1.5.3
 grpc-google-iam-v1==0.11.4
 grpcio==1.11.0
 gunicorn==19.8.1
-httplib2==0.11.3
+httplib2==0.18.0
 idna==2.6
 itsdangerous==0.24
 Jinja2==2.10