diff --git a/django-stubs/core/files/base.pyi b/django-stubs/core/files/base.pyi
index 2d84fda..9622685 100644
--- a/django-stubs/core/files/base.pyi
+++ b/django-stubs/core/files/base.pyi
@@ -8,7 +8,7 @@ _T = TypeVar("_T", bound="File")
 
 class File(FileProxyMixin, IO[Any]):
     DEFAULT_CHUNK_SIZE: Any = ...
-    file: StringIO = ...
+    file: IO[Any] = ...
     name: str = ...
     mode: str = ...
     def __init__(self, file: Any, name: Optional[str] = ...) -> None: ...