diff --git a/requirements.txt b/requirements.txt
index 8bbf825..8805be7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -88,7 +88,7 @@ statsmodels==0.13.2
 terminado==0.15.0
 threadpoolctl==3.1.0
 tinycss2==1.1.1
-tornado==6.1
+tornado==6.3.3
 traitlets==5.1.1
 typing-inspect==0.7.1
 typing_extensions==4.1.1