diff --git a/e2e_test/requirements_dev.txt b/e2e_test/requirements_dev.txt
index 7e4f0ac..9ae1f94 100644
--- a/e2e_test/requirements_dev.txt
+++ b/e2e_test/requirements_dev.txt
@@ -35,7 +35,7 @@ google-cloud-tasks==0.4.0
 googleapis-common-protos==1.5.8
 grpc-google-iam-v1==0.11.4
 grpcio==1.18.0
-gunicorn==19.9.0
+gunicorn==22.0.0
 html5lib==1.0.1
 httplib2==0.12.1
 idna==2.8