diff --git a/conf/config.json b/conf/config.json
index f8253ee..0ccf288 100644
--- a/conf/config.json
+++ b/conf/config.json
@@ -17,6 +17,8 @@
     "hashing_default_password": true,
     "localstorage.allowsymlinks": true,
     "simpleSignUpLink.shown": false,
+    "trashbin_retention_obligation": "auto, 30",
+    "versions_retention_obligation": "auto, 30",
     "mail_smtpmode": "smtp",
     "mail_smtpport": "25",
     "mail_smtpauth": 1,