diff --git a/nodes/htz-cloud/pirmasens.py b/nodes/htz-cloud/pirmasens.py
index 98afe10..8f469e0 100644
--- a/nodes/htz-cloud/pirmasens.py
+++ b/nodes/htz-cloud/pirmasens.py
@@ -10,7 +10,7 @@ nodes['htz-cloud.pirmasens'] = {
         'unbound',
     },
     'groups': {
-        'debian-buster',
+        'debian-bookworm',
         'webserver',
     },
     'metadata': {
diff --git a/nodes/htz-cloud/wireguard.py b/nodes/htz-cloud/wireguard.py
index 10af696..c6fefb6 100644
--- a/nodes/htz-cloud/wireguard.py
+++ b/nodes/htz-cloud/wireguard.py
@@ -5,7 +5,7 @@ nodes['htz-cloud.wireguard'] = {
         'wireguard',
     },
     'groups': {
-        'debian-buster',
+        'debian-bookworm',
     },
     'metadata': {
         'interfaces': {