diff --git a/appengine/flexible/websockets/requirements.txt b/appengine/flexible/websockets/requirements.txt
index be55d2ff7ae..aa04254aeee 100644
--- a/appengine/flexible/websockets/requirements.txt
+++ b/appengine/flexible/websockets/requirements.txt
@@ -1,4 +1,4 @@
 Flask==1.1.1
 Flask-Sockets==0.2.1
-gunicorn==20.0.4
+gunicorn==22.0.0
 requests==2.22.0