diff --git a/docs/requirements.txt b/docs/requirements.txt
index 39fb15a..159ad80 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -42,7 +42,7 @@ requests==2.23.0
 six==1.14.0
 starlette==0.25.0
 toml==0.10.0
-tornado==6.0.4
+tornado==6.4.1
 tqdm==4.50.0; python_version > "2.7"
 typed-ast==1.4.1
 typing-extensions==3.7.4.1