diff --git a/requirements.txt b/requirements.txt
index 587c7a3..05816fe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -71,7 +71,7 @@ terminado==0.12.1
 testpath==0.5.0
 threadpoolctl==3.1.0
 tomli==1.2.3
-tornado==6.1
+tornado==6.4.2
 traitlets==5.1.1
 typing_extensions==4.0.1
 wcwidth==0.2.5