diff --git a/requirements.txt b/requirements.txt
index a3c380f..8bb3466 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -48,7 +48,7 @@ requests==2.23.0
 requests-oauthlib==1.3.0
 rsa==4.7
 six==1.15.0
-tornado==6.0.4
+tornado==6.3.3
 traitlets==4.3.3
 typing-extensions==3.7.4.2
 urllib3==1.26.5