diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4593b8f..2b911aa 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -16,5 +16,5 @@ PyYAML==5.4
 regex==2021.8.3
 six==1.14.0
 soupsieve==2.0
-tornado==6.5
+tornado==6.5.5
 tqdm==4.66.3