diff --git a/stdlib/3/asyncio/locks.pyi b/stdlib/3/asyncio/locks.pyi
index 19d472760..55eabfffc 100644
--- a/stdlib/3/asyncio/locks.pyi
+++ b/stdlib/3/asyncio/locks.pyi
@@ -1,4 +1,5 @@
-from typing import Any, Callable, Type, TypeVar, Union, Optional, Awaitable
+import sys
+from typing import Any, Callable, Iterable, Generator, Type, TypeVar, Union, Optional, Awaitable
 
 from .events import AbstractEventLoop
 from .futures import Future
@@ -6,17 +7,28 @@ from types import TracebackType
 
 _T = TypeVar('_T')
 
-class _ContextManager:
-    def __init__(self, lock: Union[Lock, Semaphore]) -> None: ...
-    def __enter__(self) -> object: ...
-    def __exit__(self, *args: Any) -> None: ...
 
-class _ContextManagerMixin(Future[_ContextManager]):
-    # Apparently this exists to *prohibit* use as a context manager.
-    def __enter__(self) -> object: ...
-    def __exit__(self, *args: Any) -> None: ...
-    def __aenter__(self) -> Awaitable[None]: ...
-    def __aexit__(self, exc_type: Optional[Type[BaseException]], exc: Optional[BaseException], tb: Optional[TracebackType]) -> Awaitable[None]: ...
+if sys.version_info >= (3, 9):
+    class _ContextManagerMixin:
+        def __init__(self, lock: Union[Lock, Semaphore]) -> None: ...
+        def __aenter__(self) -> Awaitable[None]: ...
+        def __aexit__(self, exc_type: Optional[Type[BaseException]], exc: Optional[BaseException], tb: Optional[TracebackType]) -> Awaitable[None]: ...
+else:
+    class _ContextManager:
+        def __init__(self, lock: Union[Lock, Semaphore]) -> None: ...
+        def __enter__(self) -> object: ...
+        def __exit__(self, *args: Any) -> None: ...
+
+    class _ContextManagerMixin:
+        def __init__(self, lock: Union[Lock, Semaphore]) -> None: ...
+        # Apparently this exists to *prohibit* use as a context manager.
+        def __enter__(self) -> object: ...
+        def __exit__(self, *args: Any) -> None: ...
+        def __iter__(self) -> Generator[Any, None, _ContextManager]: ...
+        def __await__(self) -> Generator[Any, None, _ContextManager]: ...
+        def __aenter__(self) -> Awaitable[None]: ...
+        def __aexit__(self, exc_type: Optional[Type[BaseException]], exc: Optional[BaseException], tb: Optional[TracebackType]) -> Awaitable[None]: ...
+
 
 class Lock(_ContextManagerMixin):
     def __init__(self, *, loop: Optional[AbstractEventLoop] = ...) -> None: ...