diff --git a/docs/requirements.txt b/docs/requirements.txt
index 23f9526..f6ba473 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -24,5 +24,5 @@ sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.6
 sphinxcontrib-serializinghtml==1.1.9
-tornado==6.5.1
+tornado==6.5.5
 urllib3==2.6.3