diff --git a/docs/requirements.txt b/docs/requirements.txt
index a402860..f99f98d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -11,7 +11,7 @@ joblib>=1.5.3
 livereload>=2.7.1
 lunr>=0.8.0
 Markdown>=3.3.4
-MarkupSafe>=2.0.1
+MarkupSafe>=2.1.5
 mkdocs>=1.6.1
 more-itertools>=8.7.0
 nltk>=3.6.2