diff --git a/docs/tools/requirements.txt b/docs/tools/requirements.txt
index 32b8e4426ee..b23b6cd1932 100644
--- a/docs/tools/requirements.txt
+++ b/docs/tools/requirements.txt
@@ -16,7 +16,7 @@ Jinja2==2.11.1
 jsmin==2.2.2
 livereload==2.5.1
 Markdown==2.6.11
-MarkupSafe==1.0
+MarkupSafe==1.1.1
 mkdocs==1.0.4
 Pygments==2.5.2
 python-slugify==1.2.6