diff --git a/requirements.txt b/requirements.txt
index 7ec648415..e6ef320c8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ flask==1.0
 flask-session
 flask-socketio==3.3.2
 gunicorn==19.9
-gevent==0.4
+gevent==1.3.3
 gevent-websocket==0.10.1
 psutil==5.4
 pillow