diff --git a/requirements.txt b/requirements.txt
index 3806562..a4cbc71 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -138,7 +138,7 @@ terminado==0.15.0
 threadpoolctl==3.1.0
 tinycss2==1.1.1
 toolz==0.12.0
-tornado==6.2
+tornado==6.3.3
 tqdm==4.64.0
 traitlets==5.3.0
 typing_extensions==4.3.0