diff --git a/requirements.txt b/requirements.txt
index 5c88e20..fbc9dac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ google-auth-oauthlib==0.2.0
 Flask==1.0.2
 Flask-OAuthlib==0.9.5
 gunicorn==19.9.0
-httplib2==0.11.3
+httplib2==0.18.0
 
 requests==2.20.1
 requests-oauthlib==1.0.0