diff --git a/requirements.txt b/requirements.txt
index 4d615e0..303e5a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -80,7 +80,7 @@ grpcio==1.10.0
 gunicorn==19.7.1
 healthcheck==1.3.2
 html5lib==0.9999999
-httplib2==0.9.1
+httplib2==0.18.0
 humanize==0.5.1
 icalendar==3.11.7
 idna==2.6