diff --git a/requirements.txt b/requirements.txt
index b5507b3..acacf81 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ google-api-python-client==1.7.11
 google-auth==1.6.3
 google-auth-httplib2==0.0.3
 googleapis-common-protos==1.6.0
-httplib2==0.13.0
+httplib2==0.19.0
 idna==2.8
 jdcal==1.4.1
 jws==0.1.3