diff --git a/requirements.txt b/requirements.txt
index 85a80ef..e29d80d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ WTForms==2.0.2
 Werkzeug==0.10.4
 blinker==1.3
 flask-oidc==0.1.2
-httplib2==0.9.1
+httplib2==0.18.0
 itsdangerous==0.24
 oauth2client==1.4.7
 pyasn1==0.1.7