diff --git a/requirements.txt b/requirements.txt
index ec0429f..3d71404 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ six==1.14.0
 sklearn==0.0
 smart-open==1.11.1
 testpath==0.4.4
-tornado==6.0.4
+tornado==6.3.3
 traitlets==4.3.3
 urllib3==1.25.8
 wcwidth==0.1.9