diff --git a/requirements.txt b/requirements.txt
index ee52e3e..18e7096 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ Flask==0.12.2
 Flask-Session==0.3.2
 Flask-SocketIO==4.3.1
 Flask-SQLAlchemy==2.4.4
-greenlet==0.4.17
+greenlet==3.5.3
 gunicorn==18.0
 itsdangerous==1.1.0
 Jinja2==2.11.2