# typing_extensions changelog

> typing_extensions release notes.

- Vendor: typing_extensions
- Category: Frameworks & Libraries
- Official site: https://github.com/python/typing_extensions
- Tracked by: What's New (https://whatsnew.fyi/product/typing-extensions)
- Harvested from: GitHub (python/typing_extensions)
- Entries below: 10 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

## Releases

### 4.16.0

- Date: 2026-07-02
- Version: 4.16.0
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.16.0
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.16.0

No changes since 4.16.0rc2.

Changes since 4.15.0:

- Make `typing_extensions.TypeAliasType`'s `__module__` attribute writable. Backport of CPython PR [#149172](https://github.com/python/cpython/pull/149172).
- Fix setting of `__required_keys__` and `__optional_keys__` when inheriting keys with the same name.
- Add support for `AsyncIterator`, `io.Reader`, `io.Writer` and `os.PathLike` protocols as bases for other protocols.
- Fix incorrect behaviour on Python 3.9 and Python 3.10 that meant that calling `isinstance` with `typing_extensions.Concatenate[...]` or `typing_extensions.Unpack[...]` as the first argument could have a different result in some situations depending on whether or not a profiling function had been set using `sys.setprofile`. This affected both CPython and PyPy implementations. Patch by Brian Schubert.
- Fix `__init_subclass__()` behavior in the presence of multiple inheritance involving an `@deprecated`-decorated base class. Backport of CPython PR [#138210](https://github.com/python/cpython/pull/138210) by Brian Schubert.
- Raise `TypeError` when attempting to subclass `typing_extensions.ParamSpec` on Python 3.9. The `typing` implementation has always raised an error, and the `typing_extensions` implementation has raised an error on Python 3.10+ since `typing_extensions` v4.6.0. Patch by Brian Schubert.
- Add the `bound`, `covariant`, `contravariant`, and `infer_variance` parameters to `TypeVarTuple`.
- Officially support the `bound`, `covariant`, `contravariant` and `infer_variance` parameters to `ParamSpec`. Improve the validation of these parameters at runtime.
- Rename `typing_extensions.Sentinel` to `typing_extensions.sentinel`, following the name that has been adopted for `builtins.sentinel` on Python 3.15. `typing_extensions.Sentinel` is retained as a soft-deprecated alias for backwards compatibility.
- Add support for pickling sentinels.
- Sentinels now preserve their identity when copied or deep-copied.
- Deprecate passing `name` as a keyword argument or `repr` as a positional argument to the `sentinel` constructor.
- The default repr of a sentinel `X = sentinel("X")` is now `X` rather than `<X>`.
- Deprecate arbitrary attribute assignments to sentinels.
- Deprecate subclassing sentinels.
- Add support for Python 3.15.
- Avoid a `DeprecationWarning` when `deprecated` is applied to a coroutine function on Python 3.14.0.

### 4.16.0rc2

- Date: 2026-06-25
- Version: 4.16.0rc2
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.16.0rc2
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.16.0rc2
- Labels: Pre-release

Changes since 4.16.0rc1:

- Avoid a `DeprecationWarning` when `deprecated` is applied to a coroutine function on Python 3.14.0.

Changes since 4.15.0:

- Make `typing_extensions.TypeAliasType`'s `__module__` attribute writable. Backport of CPython PR [#149172](https://github.com/python/cpython/pull/149172).
- Fix setting of `__required_keys__` and `__optional_keys__` when inheriting keys with the same name.
- Add support for `AsyncIterator`, `io.Reader`, `io.Writer` and `os.PathLike` protocols as bases for other protocols.
- Fix incorrect behaviour on Python 3.9 and Python 3.10 that meant that calling `isinstance` with `typing_extensions.Concatenate[...]` or `typing_extensions.Unpack[...]` as the first argument could have a different result in some situations depending on whether or not a profiling function had been set using `sys.setprofile`. This affected both CPython and PyPy implementations. Patch by Brian Schubert.
- Fix `__init_subclass__()` behavior in the presence of multiple inheritance involving an `@deprecated`-decorated base class. Backport of CPython PR [#138210](https://github.com/python/cpython/pull/138210) by Brian Schubert.
- Raise `TypeError` when attempting to subclass `typing_extensions.ParamSpec` on Python 3.9. The `typing` implementation has always raised an error, and the `typing_extensions` implementation has raised an error on Python 3.10+ since `typing_extensions` v4.6.0. Patch by Brian Schubert.
- Add the `bound`, `covariant`, `contravariant`, and `infer_variance` parameters to `TypeVarTuple`.
- Officially support the `bound`, `covariant`, `contravariant` and `infer_variance` parameters to `ParamSpec`. Improve the validation of these parameters at runtime.
- Rename `typing_extensions.Sentinel` to `typing_extensions.sentinel`, following the name that has been adopted for `builtins.sentinel` on Python 3.15. `typing_extensions.Sentinel` is retained as a soft-deprecated alias for backwards compatibility.
- Add support for pickling sentinels.
- Sentinels now preserve their identity when copied or deep-copied.
- Deprecate passing `name` as a keyword argument or `repr` as a positional argument to the `sentinel` constructor.
- The default repr of a sentinel `X = sentinel("X")` is now `X` rather than `<X>`.
- Deprecate arbitrary attribute assignments to sentinels.
- Deprecate subclassing sentinels.
- Add support for Python 3.15.

### 4.16.0rc1

- Date: 2026-06-24
- Version: 4.16.0rc1
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.16.0rc1
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.16.0rc1
- Labels: Pre-release

- Make `typing_extensions.TypeAliasType`'s `__module__` attribute writable. Backport of CPython PR [#149172](https://github.com/python/cpython/pull/149172).
- Fix setting of `__required_keys__` and `__optional_keys__` when inheriting keys with the same name.
- Add support for `AsyncIterator`, `io.Reader`, `io.Writer` and `os.PathLike` protocols as bases for other protocols.
- Fix incorrect behaviour on Python 3.9 and Python 3.10 that meant that calling `isinstance` with `typing_extensions.Concatenate[...]` or `typing_extensions.Unpack[...]` as the first argument could have a different result in some situations depending on whether or not a profiling function had been set using `sys.setprofile`. This affected both CPython and PyPy implementations. Patch by Brian Schubert.
- Fix `__init_subclass__()` behavior in the presence of multiple inheritance involving an `@deprecated`-decorated base class. Backport of CPython PR [#138210](https://github.com/python/cpython/pull/138210) by Brian Schubert.
- Raise `TypeError` when attempting to subclass `typing_extensions.ParamSpec` on Python 3.9. The `typing` implementation has always raised an error, and the `typing_extensions` implementation has raised an error on Python 3.10+ since `typing_extensions` v4.6.0. Patch by Brian Schubert.
- Add the `bound`, `covariant`, `contravariant`, and `infer_variance` parameters to `TypeVarTuple`.
- Officially support the `bound`, `covariant`, `contravariant` and `infer_variance` parameters to `ParamSpec`. Improve the validation of these parameters at runtime.
- Rename `typing_extensions.Sentinel` to `typing_extensions.sentinel`, following the name that has been adopted for `builtins.sentinel` on Python 3.15. `typing_extensions.Sentinel` is retained as a soft-deprecated alias for backwards compatibility.
- Add support for pickling sentinels.
- Sentinels now preserve their identity when copied or deep-copied.
- Deprecate passing `name` as a keyword argument or `repr` as a positional argument to the `sentinel` constructor.
- The default repr of a sentinel `X = sentinel("X")` is now `X` rather than `<X>`.
- Deprecate arbitrary attribute assignments to sentinels.
- Deprecate subclassing sentinels.
- Add support for Python 3.15.

### 4.15.0

- Date: 2025-08-25
- Version: 4.15.0
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.15.0
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.15.0

No user-facing changes since 4.15.0rc1.

New features since 4.14.1:

- Add the `@typing_extensions.disjoint_base` decorator, as specified
  in PEP 800. Patch by Jelle Zijlstra.
- Add `typing_extensions.type_repr`, a backport of
  [`annotationlib.type_repr`](https://docs.python.org/3.14/library/annotationlib.html#annotationlib.type_repr),
  introduced in Python 3.14 (CPython PR [#124551](https://github.com/python/cpython/pull/124551),
  originally by Jelle Zijlstra). Patch by Semyon Moroz.
- Fix behavior of type params in `typing_extensions.evaluate_forward_ref`. Backport of
  CPython PR [#137227](https://github.com/python/cpython/pull/137227) by Jelle Zijlstra.

### 4.15.0rc1

- Date: 2025-08-18
- Version: 4.15.0rc1
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.15.0rc1
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.15.0rc1
- Labels: Pre-release

- Add the `@typing_extensions.disjoint_base` decorator, as specified
  in PEP 800. Patch by Jelle Zijlstra.
- Add `typing_extensions.type_repr`, a backport of
  [`annotationlib.type_repr`](https://docs.python.org/3.14/library/annotationlib.html#annotationlib.type_repr),
  introduced in Python 3.14 (CPython PR [#124551](https://github.com/python/cpython/pull/124551),
  originally by Jelle Zijlstra). Patch by Semyon Moroz.
- Fix behavior of type params in `typing_extensions.evaluate_forward_ref`. Backport of
  CPython PR [#137227](https://github.com/python/cpython/pull/137227) by Jelle Zijlstra.

### 4.14.1

- Date: 2025-07-04
- Version: 4.14.1
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.14.1
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.14.1

#### Release 4.14.1 (July 4, 2025)

- Fix usage of `typing_extensions.TypedDict` nested inside other types
  (e.g., `typing.Type[typing_extensions.TypedDict]`). This is not allowed by the
  type system but worked on older versions, so we maintain support.

### 4.14.0

- Date: 2025-06-02
- Version: 4.14.0
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.14.0
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.14.0

This release adds several new features, including experimental support for inline typed dictionaries ([PEP 764](https://peps.python.org/pep-0764/)) and sentinels ([PEP 661](https://peps.python.org/pep-0661/)), and support for changes in Python 3.14. In addition, Python 3.8 is no longer supported.

Changes since 4.14.0rc1:

- Remove `__or__` and `__ror__` methods from `typing_extensions.Sentinel`
  on Python versions <3.10. PEP 604 was introduced in Python 3.10, and
  `typing_extensions` does not generally attempt to backport PEP-604 methods
  to prior versions.
- Further update `typing_extensions.evaluate_forward_ref` with changes in Python 3.14.

Changes included in 4.14.0rc1:

- Drop support for Python 3.8 (including PyPy-3.8). Patch by [Victorien Plot](https://github.com/Viicos).
- Do not attempt to re-export names that have been removed from `typing`,
  anticipating the removal of `typing.no_type_check_decorator` in Python 3.15.
  Patch by Jelle Zijlstra.
- Update `typing_extensions.Format`, `typing_extensions.evaluate_forward_ref`, and
  `typing_extensions.TypedDict` to align
  with changes in Python 3.14. Patches by Jelle Zijlstra.
- Fix tests for Python 3.14 and 3.15. Patches by Jelle Zijlstra.

New features:

- Add support for inline typed dictionaries ([PEP 764](https://peps.python.org/pep-0764/)).
  Patch by [Victorien Plot](https://github.com/Viicos).
- Add `typing_extensions.Reader` and `typing_extensions.Writer`. Patch by
  Sebastian Rittau.
- Add support for sentinels ([PEP 661](https://peps.python.org/pep-0661/)). Patch by
  [Victorien Plot](https://github.com/Viicos).

### 4.14.0rc1

- Date: 2025-05-24
- Version: 4.14.0rc1
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.14.0rc1
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.14.0rc1
- Labels: Pre-release

Major changes:

- Drop support for Python 3.8 (including PyPy-3.8). Patch by [Victorien Plot](https://github.com/Viicos).
- Do not attempt to re-export names that have been removed from `typing`,
  anticipating the removal of `typing.no_type_check_decorator` in Python 3.15.
  Patch by Jelle Zijlstra.
- Update `typing_extensions.Format`, `typing_extensions.evaluate_forward_ref`, and
  `typing_extensions.TypedDict` to align
  with changes in Python 3.14. Patches by Jelle Zijlstra.
- Fix tests for Python 3.14 and 3.15. Patches by Jelle Zijlstra.

New features:

- Add support for inline typed dictionaries ([PEP 764](https://peps.python.org/pep-0764/)).
  Patch by [Victorien Plot](https://github.com/Viicos).
- Add `typing_extensions.Reader` and `typing_extensions.Writer`. Patch by
  Sebastian Rittau.
- Add support for sentinels ([PEP 661](https://peps.python.org/pep-0661/)). Patch by
  [Victorien Plot](https://github.com/Viicos).

### 4.13.2

- Date: 2025-04-10
- Version: 4.13.2
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.13.2
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.13.2

- Fix `TypeError` when taking the union of `typing_extensions.TypeAliasType` and a
  `typing.TypeAliasType` on Python 3.12 and 3.13.
  Patch by [Joren Hammudoglu](https://github.com/jorenham).
- Backport from CPython PR [#132160](https://github.com/python/cpython/pull/132160)
  to avoid having user arguments shadowed in generated `__new__` by
  `@typing_extensions.deprecated`.
  Patch by [Victorien Plot](https://github.com/Viicos).

### 4.13.1

- Date: 2025-04-03
- Version: 4.13.1
- Original notes: https://github.com/python/typing_extensions/releases/tag/4.13.1
- Permalink: https://whatsnew.fyi/product/typing-extensions/releases/4.13.1

This is a bugfix release fixing two edge cases that appear on old bugfix releases of CPython.

Bugfixes:
- Fix regression in 4.13.0 on Python 3.10.2 causing a `TypeError` when using `Concatenate`.
  Patch by [Daraan](https://github.com/Daraan).
- Fix `TypeError` when using `evaluate_forward_ref` on Python 3.10.1-2 and 3.9.8-10.
  Patch by [Daraan](https://github.com/Daraan).