diff --git a/requirements.txt b/requirements.txt
index 947b511..f1f09e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -167,7 +167,7 @@ threadpoolctl==3.1.0
 timezonefinder==5.2.0
 tinynumpy==1.2.1
 tomli==2.0.1
-tornado==6.1
+tornado==6.3.3
 tqdm==4.63.0
 traitlets==5.1.1
 typing_extensions==4.1.1