diff --git a/helmfile/apps/univention-management-stack/helmfile.yaml b/helmfile/apps/univention-management-stack/helmfile.yaml
index 425525f3..fd707fc2 100644
--- a/helmfile/apps/univention-management-stack/helmfile.yaml
+++ b/helmfile/apps/univention-management-stack/helmfile.yaml
@@ -94,6 +94,7 @@ releases:
       - "values-common.gotmpl"
       - "values-common.yaml"
       - "values-udm-rest-api.gotmpl"
+      - "values-udm-rest-api.yaml"
     installed: {{ .Values.univentionManagementStack.enabled }}
 
   # renovate:
diff --git a/helmfile/apps/univention-management-stack/values-udm-rest-api.yaml b/helmfile/apps/univention-management-stack/values-udm-rest-api.yaml
new file mode 100644
index 00000000..e0103a21
--- /dev/null
+++ b/helmfile/apps/univention-management-stack/values-udm-rest-api.yaml
@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2023 Bundesministerium des Innern und für Heimat, PG ZenDiS "Projektgruppe für Aufbau ZenDiS"
+# SPDX-License-Identifier: Apache-2.0
+---
+extraVolumes:
+  - name: "attribute-to-group-mapper-hook"
+    configMap:
+      name: "ums-stack-data-swp-attribute-to-group-mapper-hook"
+
+extraVolumeMounts:
+  - name: "attribute-to-group-mapper-hook"
+    mountPath: "/usr/lib/python3/dist-packages/univention/admin/hooks.d/AttributeToGroupMapper.py"
+    subPath: "AttributeToGroupMapper.py"
+  - name: "attribute-to-group-mapper-hook"
+    mountPath: "/usr/share/attribute-to-group-mapper/flag_to_group_mapping.json"
+    subPath: "flag_to_group_mapping.json"
+
+...
diff --git a/helmfile/apps/univention-management-stack/values-umc-server.yaml b/helmfile/apps/univention-management-stack/values-umc-server.yaml
index 6c0bc599..678f022f 100644
--- a/helmfile/apps/univention-management-stack/values-umc-server.yaml
+++ b/helmfile/apps/univention-management-stack/values-umc-server.yaml
@@ -17,6 +17,9 @@ extraVolumes:
     configMap:
       name: "ums-stack-data-swp-self-service-emails"
       defaultMode: 0444
+  - name: "attribute-to-group-mapper-hook"
+    configMap:
+      name: "ums-stack-data-swp-attribute-to-group-mapper-hook"
 
 extraVolumeMounts:
   - name: "certificates"
@@ -26,5 +29,12 @@ extraVolumeMounts:
     subPath: "90-customization.sh"
   - name: "self-service-emails"
     mountPath: "/usr/share/univention-self-service/email_bodies"
+  - name: "attribute-to-group-mapper-hook"
+    mountPath: "/usr/lib/python3/dist-packages/univention/admin/hooks.d/AttributeToGroupMapper.py"
+    subPath: "AttributeToGroupMapper.py"
+  - name: "attribute-to-group-mapper-hook"
+    mountPath: "/usr/share/attribute-to-group-mapper/flag_to_group_mapping.json"
+    subPath: "flag_to_group_mapping.json"
+
 
 ...