diff --git a/requirements.txt b/requirements.txt
index d5dc68212991..17a31728033c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -427,7 +427,7 @@ toolz==1.1.0
     # via
     #   dask
     #   partd
-tornado==6.5.4
+tornado==6.5.5
     # via
     #   ipykernel
     #   jupyter-client