diff --git a/requirements-tests.txt b/requirements-tests.txt
index 3f505e48e..f6252a9ad 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -21,7 +21,7 @@ stubdefaulter==0.1.0; python_version < "3.14"
 termcolor>=2.3
 tomli==2.2.1; python_version < "3.11"
 tomlkit==0.13.3
-typing_extensions>=4.14.0rc1
+typing_extensions>=4.15.0rc1
 uv==0.8.6
 
 # Utilities for typeshed infrastructure scripts.
diff --git a/stdlib/typing_extensions.pyi b/stdlib/typing_extensions.pyi
index 71bf3d87d..4b217e748 100644
--- a/stdlib/typing_extensions.pyi
+++ b/stdlib/typing_extensions.pyi
@@ -120,6 +120,7 @@ __all__ = [
     "clear_overloads",
     "dataclass_transform",
     "deprecated",
+    "disjoint_base",
     "Doc",
     "evaluate_forward_ref",
     "get_overloads",
@@ -150,6 +151,7 @@ __all__ = [
     "TypeGuard",
     "TypeIs",
     "TYPE_CHECKING",
+    "type_repr",
     "Never",
     "NoReturn",
     "ReadOnly",
@@ -219,6 +221,7 @@ runtime = runtime_checkable
 Final: _SpecialForm
 
 def final(f: _F) -> _F: ...
+def disjoint_base(cls: _TC) -> _TC: ...
 
 Literal: _SpecialForm
 
@@ -616,7 +619,7 @@ TypeForm: _SpecialForm
 if sys.version_info >= (3, 14):
     from typing import evaluate_forward_ref as evaluate_forward_ref
 
-    from annotationlib import Format as Format, get_annotations as get_annotations
+    from annotationlib import Format as Format, get_annotations as get_annotations, type_repr as type_repr
 else:
     class Format(enum.IntEnum):
         VALUE = 1
@@ -684,6 +687,7 @@ else:
         format: Format | None = None,
         _recursive_guard: Container[str] = ...,
     ) -> AnnotationForm: ...
+    def type_repr(value: object) -> str: ...
 
 # PEP 661
 class Sentinel: