diff --git a/stdlib/importlib/resources.pyi b/stdlib/importlib/resources.pyi
index 075761abf..194c0bac2 100644
--- a/stdlib/importlib/resources.pyi
+++ b/stdlib/importlib/resources.pyi
@@ -4,9 +4,10 @@ from typing import Any
 # This is a >=3.7 module, so we conditionally include its source.
 if sys.version_info >= (3, 7):
     import os
+    from contextlib import AbstractContextManager
     from pathlib import Path
     from types import ModuleType
-    from typing import BinaryIO, ContextManager, Iterator, TextIO, Union
+    from typing import BinaryIO, Iterator, TextIO, Union
 
     Package = Union[str, ModuleType]
     Resource = Union[str, os.PathLike[Any]]
@@ -14,12 +15,11 @@ if sys.version_info >= (3, 7):
     def open_text(package: Package, resource: Resource, encoding: str = ..., errors: str = ...) -> TextIO: ...
     def read_binary(package: Package, resource: Resource) -> bytes: ...
     def read_text(package: Package, resource: Resource, encoding: str = ..., errors: str = ...) -> str: ...
-    def path(package: Package, resource: Resource) -> ContextManager[Path]: ...
+    def path(package: Package, resource: Resource) -> AbstractContextManager[Path]: ...
     def is_resource(package: Package, name: str) -> bool: ...
     def contents(package: Package) -> Iterator[str]: ...
 
 if sys.version_info >= (3, 9):
-    from contextlib import AbstractContextManager
     from importlib.abc import Traversable
     def files(package: Package) -> Traversable: ...
     def as_file(path: Traversable) -> AbstractContextManager[Path]: ...
diff --git a/stdlib/smtpd.pyi b/stdlib/smtpd.pyi
index 5d9307300..2b6020524 100644
--- a/stdlib/smtpd.pyi
+++ b/stdlib/smtpd.pyi
@@ -1,7 +1,8 @@
 import asynchat
 import asyncore
 import socket
-from typing import Any, DefaultDict, Tuple, Type
+from collections import defaultdict
+from typing import Any, Tuple, Type
 
 _Address = Tuple[str, int]  # (host, port)
 
@@ -9,7 +10,7 @@ class SMTPChannel(asynchat.async_chat):
     COMMAND: int
     DATA: int
 
-    command_size_limits: DefaultDict[str, int]
+    command_size_limits: defaultdict[str, int]
     smtp_server: SMTPServer
     conn: socket.socket
     addr: Any
diff --git a/stdlib/unittest/case.pyi b/stdlib/unittest/case.pyi
index 057ac1620..2ae071443 100644
--- a/stdlib/unittest/case.pyi
+++ b/stdlib/unittest/case.pyi
@@ -4,13 +4,13 @@ import sys
 import unittest.result
 from _typeshed import Self
 from collections.abc import Set  # equivalent to typing.AbstractSet, not builtins.set
+from contextlib import AbstractContextManager
 from types import TracebackType
 from typing import (
     Any,
     AnyStr,
     Callable,
     Container,
-    ContextManager,
     Generic,
     Iterable,
     Mapping,
@@ -61,7 +61,7 @@ class TestCase:
     def run(self, result: unittest.result.TestResult | None = ...) -> unittest.result.TestResult | None: ...
     def __call__(self, result: unittest.result.TestResult | None = ...) -> unittest.result.TestResult | None: ...
     def skipTest(self, reason: Any) -> None: ...
-    def subTest(self, msg: Any = ..., **params: Any) -> ContextManager[None]: ...
+    def subTest(self, msg: Any = ..., **params: Any) -> AbstractContextManager[None]: ...
     def debug(self) -> None: ...
     def _addSkip(self, result: unittest.result.TestResult, test_case: TestCase, reason: str) -> None: ...
     def assertEqual(self, first: Any, second: Any, msg: Any = ...) -> None: ...