diff --git a/backend/routers/backups.py b/backend/routers/backups.py
index d2e4cd8..cbd1e2b 100644
--- a/backend/routers/backups.py
+++ b/backend/routers/backups.py
@@ -19,7 +19,7 @@ Adaptations strictement équivalentes :
 import logging
 import os
 import time
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from pathlib import Path
 from typing import Any
 
@@ -207,7 +207,7 @@ async def api_backups_list(
                 "file": rel_file,
                 "backup_file": fpath.name,
                 "timestamp": ts,
-                "datetime": datetime.fromtimestamp(ts, tz=timezone.utc).isoformat(),
+                "datetime": datetime.fromtimestamp(ts, tz=UTC).isoformat(),
                 "size": fsize,
                 "full_path": str(fpath),
             })