diff --git a/notebook-samples/requirements.txt b/notebook-samples/requirements.txt
index 033e0f8..389dada 100644
--- a/notebook-samples/requirements.txt
+++ b/notebook-samples/requirements.txt
@@ -13,7 +13,7 @@ seaborn
 statsmodels
 tensorflow>=2.4.0
 torch==1.2.0
-tornado==5.1.1
+tornado==6.3.3
 traitlets
 xarray
 xgboost