diff --git a/requirements.txt b/requirements.txt
index 30794e8..7a8fd46 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,4 +11,4 @@ pyparsing==2.4.2
 python-dateutil==2.8.0
 pytz==2019.2
 six==1.12.0
-tornado==6.0.3
+tornado==6.3.3