diff --git a/docs/requirements.txt b/docs/requirements.txt
index e82916bc..33914b7d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -36,5 +36,5 @@ sphinx-notfound-page==0.8.3
 sphinx-prompt==1.6.0
 sphinx-rtd-theme==1.2.2
 sphinx-tabs==3.4.1
-tornado==6.3.3
+tornado==6.4.1
 urllib3==2.0.7