diff --git a/stdlib/types.pyi b/stdlib/types.pyi
index 1163d71d2c95..75d34aabee90 100644
--- a/stdlib/types.pyi
+++ b/stdlib/types.pyi
@@ -16,7 +16,7 @@ from collections.abc import (
     ValuesView,
 )
 from importlib.machinery import ModuleSpec
-from typing import Any, ClassVar, Literal, TypeVar, final, overload
+from typing import Any, ClassVar, Literal, TypeVar, Union, final, overload
 from typing_extensions import ParamSpec, Self, TypeAliasType, TypeVarTuple, deprecated
 
 if sys.version_info >= (3, 14):
@@ -675,17 +675,9 @@ class GenericAlias:
     # GenericAlias delegates attr access to `__origin__`
     def __getattr__(self, name: str) -> Any: ...
 
-if sys.version_info >= (3, 10):
-    @final
-    class NoneType:
-        def __bool__(self) -> Literal[False]: ...
-
-    @final
-    class EllipsisType: ...
-
-    from builtins import _NotImplementedType
-
-    NotImplementedType = _NotImplementedType
+if sys.version_info >= (3, 14):
+    UnionType = Union
+elif sys.version_info >= (3, 10):
     @final
     class UnionType:
         @property
@@ -697,6 +689,17 @@ if sys.version_info >= (3, 10):
         def __eq__(self, value: object, /) -> bool: ...
         def __hash__(self) -> int: ...
 
+    @final
+    class NoneType:
+        def __bool__(self) -> Literal[False]: ...
+
+    @final
+    class EllipsisType: ...
+
+    from builtins import _NotImplementedType
+
+    NotImplementedType = _NotImplementedType
+
 if sys.version_info >= (3, 13):
     @final
     class CapsuleType: ...
diff --git a/stdlib/typing.pyi b/stdlib/typing.pyi
index 5aa85543ed2c..bf878e4fba58 100644
--- a/stdlib/typing.pyi
+++ b/stdlib/typing.pyi
@@ -235,7 +235,22 @@ class _SpecialForm(_Final):
         def __or__(self, other: Any) -> _SpecialForm: ...
         def __ror__(self, other: Any) -> _SpecialForm: ...
 
-Union: _SpecialForm
+if sys.version_info >= (3, 14):
+    @final
+    class Union:
+        @property
+        def __args__(self) -> tuple[Any, ...]: ...
+        @property
+        def __parameters__(self) -> tuple[Any, ...]: ...
+        def __or__(self, value: Any, /) -> UnionType: ...
+        def __ror__(self, value: Any, /) -> UnionType: ...
+        def __eq__(self, value: object, /) -> bool: ...
+        def __hash__(self) -> int: ...
+        def __class_getitem__(cls, item: Any) -> Self: ...
+
+else:
+    Union: _SpecialForm
+
 Generic: _SpecialForm
 Protocol: _SpecialForm
 Callable: _SpecialForm