diff --git a/requirements.txt b/requirements.txt
index e5ad65f..1c6cede 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ connexion[swagger-ui]==2.2.0
 google-auth==1.7.1
 google-cloud-storage==1.9.0
 flask>=1.0.0
-gunicorn==20.0.4
+gunicorn==21.2.0
 gevent==1.4.0
 requests==2.20.0
 requests-mock==1.5.0