diff --git a/tests/utils.py b/tests/utils.py
index af0434c8..92f10883 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,6 +1,8 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
+from __future__ import annotations
+
 from datetime import datetime
 from typing import Any, Dict, List
 
@@ -16,7 +18,7 @@ def get_path(self, id: str) -> str:
 
 
 class FakeContentsManager:
-    def __init__(self, model: Dict[str, str]):
+    def __init__(self, model: dict[str, str]):
         self.model = {
             "name": "",
             "path": "",
@@ -30,7 +32,7 @@ def __init__(self, model: Dict[str, str]):
         }
         self.model.update(model)
 
-        self.actions: List[str] = []
+        self.actions: list[str] = []
 
     def get(
         self, path: str, content: bool = True, format: str | None = None, type: str | None = None