diff --git a/requirements.txt b/requirements.txt
index fd55daa..4adb397 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ isodate==0.6.0
 itsdangerous==2.0.1
 Jinja2==3.0.3
 jsonschema==4.4.0
-MarkupSafe==2.0.1
+MarkupSafe==2.1.5
 mccabe==0.6.1
 numpy==1.22.2
 pycodestyle==2.8.0