diff --git a/php/containers.json b/php/containers.json
index 1ca7fa86a69..d9cb2fe9a05 100644
--- a/php/containers.json
+++ b/php/containers.json
@@ -613,7 +613,8 @@
       ],
       "networks": [
         "nextcloud-aio"
-      ]
+      ],
+      "read_only": true
     }
   ]
 }