diff --git a/requirements.txt b/requirements.txt
index c74e474..42d38b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 Flask==1.1.1
 gunicorn==20.1.0
 Jinja2==2.10.1
-MarkupSafe==2.1.3
+markupsafe==2.0.1
 Werkzeug==0.15.5
 numpy>=1.9.2
 scipy>=0.15.1