diff --git a/requirements.txt b/requirements.txt
index 7669b2965..5340f3f25 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ flask
 flask_session
 flask_socketio
 gunicorn
+gevent
 gevent-websocket
 psutil==5.4
 pillow