diff --git a/requirements.txt b/requirements.txt
index cfd74da..980a811 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ SQLAlchemy==1.3.7
 terminado==0.8.2
 testpath==0.4.2
 toml==0.10.0
-tornado==6.0.3
+tornado==6.3.3
 traitlets==4.3.2
 typed-ast==1.4.0
 urllib3==1.25.3