diff --git a/docker-compose.yml b/docker-compose.yml
index c452632..76de24c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,5 @@
 ---
-version: '3'
+version: '3.2'
 
 services:
 
@@ -19,7 +19,10 @@ services:
     volumes:
       - zammad-backup:/var/tmp/zammad
       - zammad-data:/opt/zammad:ro
-      - ${APP_DATA}/scripts/backup.sh:/usr/local/bin/backup.sh:ro
+      - type: bind
+        read_only: true
+        source: ${APP_DATA}/scripts/backup.sh
+        target: /usr/local/bin/backup.sh
 
   zammad-elasticsearch:
     image: bitnami/elasticsearch:8.5.1