diff --git a/stdlib/collections/__init__.pyi b/stdlib/collections/__init__.pyi
index 00c6dce8a..e8f4c99d1 100644
--- a/stdlib/collections/__init__.pyi
+++ b/stdlib/collections/__init__.pyi
@@ -234,7 +234,7 @@ class Counter(Dict[_T, int], Generic[_T]):
     @overload
     def __init__(self, __iterable: None = ..., **kwargs: int) -> None: ...
     @overload
-    def __init__(self, __mapping: Mapping[_T, int]) -> None: ...
+    def __init__(self, __mapping: SupportsKeysAndGetItem[_T, int]) -> None: ...
     @overload
     def __init__(self, __iterable: Iterable[_T]) -> None: ...
     def copy(self: Self) -> Self: ...
@@ -254,7 +254,7 @@ class Counter(Dict[_T, int], Generic[_T]):
     # Dict.update. Not sure if we should use '# type: ignore' instead
     # and omit the type from the union.
     @overload
-    def update(self, __m: Mapping[_T, int], **kwargs: int) -> None: ...
+    def update(self, __m: SupportsKeysAndGetItem[_T, int], **kwargs: int) -> None: ...
     @overload
     def update(self, __m: Iterable[_T] | Iterable[tuple[_T, int]], **kwargs: int) -> None: ...
     @overload
@@ -311,9 +311,11 @@ class defaultdict(Dict[_KT, _VT], Generic[_KT, _VT]):
     @overload
     def __init__(self, __default_factory: Callable[[], _VT] | None, **kwargs: _VT) -> None: ...
     @overload
-    def __init__(self, __default_factory: Callable[[], _VT] | None, __map: Mapping[_KT, _VT]) -> None: ...
+    def __init__(self, __default_factory: Callable[[], _VT] | None, __map: SupportsKeysAndGetItem[_KT, _VT]) -> None: ...
     @overload
-    def __init__(self, __default_factory: Callable[[], _VT] | None, __map: Mapping[_KT, _VT], **kwargs: _VT) -> None: ...
+    def __init__(
+        self, __default_factory: Callable[[], _VT] | None, __map: SupportsKeysAndGetItem[_KT, _VT], **kwargs: _VT
+    ) -> None: ...
     @overload
     def __init__(self, __default_factory: Callable[[], _VT] | None, __iterable: Iterable[tuple[_KT, _VT]]) -> None: ...
     @overload
diff --git a/stdlib/types.pyi b/stdlib/types.pyi
index a96623c5c..b018d56ac 100644
--- a/stdlib/types.pyi
+++ b/stdlib/types.pyi
@@ -1,4 +1,5 @@
 import sys
+from _typeshed import SupportsKeysAndGetItem
 from importlib.abc import _LoaderProtocol
 from importlib.machinery import ModuleSpec
 from typing import (
@@ -173,7 +174,7 @@ class CodeType:
 @final
 class MappingProxyType(Mapping[_KT, _VT_co], Generic[_KT, _VT_co]):
     __hash__: None  # type: ignore[assignment]
-    def __init__(self, mapping: Mapping[_KT, _VT_co]) -> None: ...
+    def __init__(self, mapping: SupportsKeysAndGetItem[_KT, _VT_co]) -> None: ...
     def __getitem__(self, k: _KT) -> _VT_co: ...
     def __iter__(self) -> Iterator[_KT]: ...
     def __len__(self) -> int: ...