diff --git a/requirements.txt b/requirements.txt
index 97fbdc1..f296f96 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ Flask==1.0.2
 gcloud==0.18.3
 googleapis-common-protos==1.5.9
 gunicorn==19.9.0
-httplib2==0.12.1
+httplib2==0.18.0
 idna==2.8
 itsdangerous==1.1.0
 Jinja2==2.10.1