diff --git a/requirements.txt b/requirements.txt
index ca90c82..5d92372 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ six==1.16.0
 stack-data==0.6.2
 statsmodels==0.14.1
 tenacity==8.2.3
-tornado==6.3.3
+tornado==6.4.2
 tqdm==4.66.1
 traitlets==5.14.1
 typing_extensions==4.9.0