diff --git a/requirements.txt b/requirements.txt
index b4e68c0..238985f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ google-api-python-client==1.7.11
 google-auth==1.11.0
 google-auth-httplib2==0.0.3
 google-auth-oauthlib==0.4.1
-httplib2==0.17.0
+httplib2==0.18.0
 idna==2.8
 isodate==0.6.0
 oauthlib==3.1.0