diff --git a/tornado_tree/requirements.txt b/tornado_tree/requirements.txt
index 4abe5b4..868815e 100644
--- a/tornado_tree/requirements.txt
+++ b/tornado_tree/requirements.txt
@@ -7,5 +7,5 @@ python-editor==1.0.4
 six==1.14.0
 SQLAlchemy==1.3.13
 SQLAlchemy-Utils==0.36.1
-tornado==6.0.3
+tornado==6.3.3
 tornado-sqlalchemy==0.7.0