diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 1ff4c2483e..667fb4fb64 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -240,7 +240,7 @@ def get_typed_signature(call: Callable[..., Any]) -> inspect.Signature:
     return typed_signature
 
 
-class _LenientDict(dict):
+class _LenientDict(dict[str, Any]):
     """Dict subclass where missing keys resolve to Any.
 
     Used as an eval namespace so that undefined forward references (e.g. a