diff --git a/docker-images/requirements.txt b/docker-images/requirements.txt
index 516e976..d157b31 100644
--- a/docker-images/requirements.txt
+++ b/docker-images/requirements.txt
@@ -1,2 +1,2 @@
 meinheld==1.0.2
-gunicorn==20.1.0
+gunicorn==21.1.0