diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0fc945ce..1fc00b8a 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,3 +5,4 @@ pymdown-extensions
 mkdocs-static-i18n
 jieba
 mkdocs-redirects
+markdown>=3.8.1 # not directly required, pinned by Snyk to avoid a vulnerability