diff --git a/tests/test_v54.py b/tests/test_v54.py
index de80991..7084bb2 100644
--- a/tests/test_v54.py
+++ b/tests/test_v54.py
@@ -205,7 +205,14 @@ class TestV54TrashPurge:
         os.environ["PROJECT_SYNC_ENABLED"] = "false"
 
         import app.config
-        app.config.settings = app.config.Settings()
+        # In-place mutation, jamais de rebinding : les modules importés plus tôt
+        # (sso_provisioning, trash, …) gardent une référence à l'objet courant.
+        _s = app.config.settings
+        _s.database_url = f"sqlite:///{tmp.name}"
+        _s.app_secret_key = "test-secret"
+        _s.rate_limit_enabled = False
+        _s.backup_enabled = False
+        _s.project_sync_enabled = False
         init_db()
 
         with get_conn() as conn: