diff --git a/requirements.txt b/requirements.txt
index 5b3bbab..62e7549 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Flask==1.1.1
 Flask-Sockets==0.2.1
 gevent==1.4.0
 gevent-websocket==0.10.1
-greenlet==0.4.15
+greenlet==1.1.0
 itsdangerous==1.1.0
 Jinja2==2.10.1
 MarkupSafe==1.1.1