diff --git a/requirements.txt b/requirements.txt
index 0996469..25d9ea7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@ scipy==1.3.0
 seaborn==0.9.0
 six==1.12.0
 SQLAlchemy==1.3.6
-tornado==6.0.3
+tornado==6.3.3
 traitlets==4.3.2
 urllib3==1.25.3
 wcwidth==0.1.7