diff --git a/requirements.txt b/requirements.txt
index dbc20c3..2c53805 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ Flask-Mail==0.9.1
 Flask-Script==2.0.5
 Flask-SQLAlchemy==2.1
 Flask-WTF==0.12
-httplib2==0.9.1
+httplib2==0.18.0
 logutils==0.3.3
 oauth2client==1.5.1
 PyMySQL==0.6.7