diff --git a/docs/requirements.txt b/docs/requirements.txt
index 7094696..284694c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -20,4 +20,4 @@ sphinx-automodapi
 graphviz
 tqdm
 ruamel.yaml
-tornado>=6.3.2 # not directly required, pinned by Snyk to avoid a vulnerability
+tornado>=6.3.3 # not directly required, pinned by Snyk to avoid a vulnerability