diff --git a/gcstransfer/requirements.txt b/gcstransfer/requirements.txt
index c3fada4..c009799 100644
--- a/gcstransfer/requirements.txt
+++ b/gcstransfer/requirements.txt
@@ -3,7 +3,7 @@ google-api-python-client==1.7.8
 google-auth==1.6.3
 google-auth-httplib2==0.0.3
 google-cloud==0.34.0
-httplib2==0.12.3
+httplib2==0.19.0
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 rsa==4.0