diff --git a/smart-docs/requirements.txt b/smart-docs/requirements.txt
index 3ecd6dd0..4c7ff997 100644
--- a/smart-docs/requirements.txt
+++ b/smart-docs/requirements.txt
@@ -26,6 +26,6 @@ sphinx-autobuild==0.7.1
 sphinx-rtd-theme==0.4.0
 sphinxcontrib-websupport==1.1.0
 string-grouper==0.5.0
-tornado==5.1
+tornado==6.4.1
 urllib3==1.23
 watchdog==0.8.3