diff --git a/requirements.txt b/requirements.txt
index f7efadf..ed4d7e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ flask==1.1.2
 jinja2==2.11.3
 flask-pyoidc==1.3.0
 gunicorn==20.0.4
+markupsafe==2.0.1
 paramiko==2.7.2
 proxmoxer==1.1.1
 psutil==5.8.0