diff --git a/appengine/standard/mailgun/requirements.txt b/appengine/standard/mailgun/requirements.txt
index 993231295f8..2a367cd1098 100644
--- a/appengine/standard/mailgun/requirements.txt
+++ b/appengine/standard/mailgun/requirements.txt
@@ -1 +1 @@
-httplib2==0.15.0
+httplib2==0.17.1