diff --git a/docs/mkdocs/requirements.txt b/docs/mkdocs/requirements.txt
index 932c0f9f6..0bc240652 100644
--- a/docs/mkdocs/requirements.txt
+++ b/docs/mkdocs/requirements.txt
@@ -18,7 +18,7 @@ livereload==2.6.3
 lunr==0.6.2
 Markdown==3.3.7            # we cannot install a more recent version yet as mkdocs 1.4.2 depends on markdown<3.4
 markdown-include==0.8.0
-MarkupSafe==2.1.1
+MarkupSafe==2.1.3
 mergedeep==1.3.4
 mkdocs==1.4.2
 mkdocs-git-revision-date-localized-plugin==1.1.0