diff --git a/python_requirements.txt b/python_requirements.txt
index cf41df8d5d..0a726245b8 100644
--- a/python_requirements.txt
+++ b/python_requirements.txt
@@ -839,7 +839,7 @@ toml==0.10.2
     # via
     #   -r requirements.in
     #   swcc
-tornado==6.5.9
+tornado==6.6
     # via
     #   -r requirements.in
     #   bokeh