diff --git a/requirements.txt b/requirements.txt
index 12fde28..fe362e9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -121,7 +121,7 @@ tinycss2==1.1.1
 toml==0.10.2
 tomli==2.0.1
 toolz==0.11.2
-tornado==6.1
+tornado==6.5.5
 tqdm==4.64.0
 traitlets==5.2.2.post1
 typing_extensions==4.2.0