diff --git a/nodes/netcup.mails.py b/nodes/netcup.mails.py
index 703f2bd..3b0f4b0 100644
--- a/nodes/netcup.mails.py
+++ b/nodes/netcup.mails.py
@@ -2,7 +2,7 @@
     'hostname': '202.61.255.108',
     'groups': [
         'backup',
-        'debian-11',
+        'debian-12',
         'mailserver',
         'monitored',
         'webserver',