diff --git a/requirements.txt b/requirements.txt
index 6257e9f..48d6ed0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ google-cloud-datastore==1.0.0
 google-gax==0.15.13
 googleapis-common-protos==1.5.2
 grpcio==1.4.0
-httplib2==0.10.3
+httplib2==0.18.0
 idna==2.5
 itsdangerous==0.24
 Jinja2==2.9.6