diff --git a/docs/requirements.txt b/docs/requirements.txt
index 963c797ea..c627e7dde 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -45,7 +45,7 @@ sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.7
 sphinxcontrib-serializinghtml==1.1.10
-tornado==6.3.2
+tornado==6.4
 typeguard==3.0.2
 Unidecode==1.3.8
 urllib3==2.0.2