diff --git a/nodes/htz-cloud.afra.toml b/nodes/htz-cloud.afra.toml
index 5e89e98..65f9b5d 100644
--- a/nodes/htz-cloud.afra.toml
+++ b/nodes/htz-cloud.afra.toml
@@ -9,7 +9,7 @@ bundles = [
     "zfs",
 ]
 groups = [
-    "debian-bullseye",
+    "debian-bookworm",
     "webserver",
 ]
 
diff --git a/nodes/htz-cloud/miniserver.py b/nodes/htz-cloud/miniserver.py
index 9e2c246..551ddf7 100644
--- a/nodes/htz-cloud/miniserver.py
+++ b/nodes/htz-cloud/miniserver.py
@@ -13,7 +13,7 @@ nodes['htz-cloud.miniserver'] = {
         'zfs',
     },
     'groups': {
-        'debian-bullseye',
+        'debian-bookworm',
         'webserver',
     },
     'metadata': {