diff --git a/requirements.txt b/requirements.txt
index 43eb9cf..c401dc8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,4 +11,4 @@ logfmt==0.4
 mypy==0.761
 PyYAML==5.4
 requests==2.22.0
-tornado==6.0.3
+tornado==6.3.3