diff --git a/php/containers.json b/php/containers.json
index 45af71e5..99776f45 100644
--- a/php/containers.json
+++ b/php/containers.json
@@ -219,7 +219,8 @@
       "restart": "unless-stopped",
       "networks": [
         "nextcloud-aio"
-      ]
+      ],
+      "read_only": true
     },
     {
       "container_name": "nextcloud-aio-collabora",