diff --git a/requirements.txt b/requirements.txt
index 4e62e68..41b574d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ google-auth==1.5.1
 google-cloud-vision==0.34.0
 googleapis-common-protos==1.5.3
 grpcio==1.15.0
-gunicorn==19.9.0
+gunicorn==22.0.0
 idna==2.7
 itsdangerous==0.24
 Jinja2==2.10