Sourced from black's releases.

26.3.1

Stable style

• Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely (#5038)

Configuration

• Always hash cache filename components derived from --python-cell-magics so custom magic names cannot affect cache paths (#5038)

Blackd

• Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure (#5039)

26.3.0

Stable style

• Don't double-decode input, causing non-UTF-8 files to be corrupted (#4964)
• Fix crash on standalone comment in lambda default arguments (#4993)
• Preserve parentheses when # type: ignore comments would be merged with other comments on the same line, preventing AST equivalence failures (#4888)

Preview style

• Fix bug where if guards in case blocks were incorrectly split when the pattern had a trailing comma (#4884)
• Fix string_processing crashing on unassigned long string literals with trailing commas (one-item tuples) (#4929)
• Simplify implementation of the power operator "hugging" logic (#4918)

Packaging

• Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments (#4930)

Performance

• Introduce winloop for windows as an alternative to uvloop (#4996)
• Remove deprecated function uvloop.install() in favor of uvloop.new_event_loop() (#4996)
• Rename maybe_install_uvloop function to maybe_use_uvloop to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop (#4996)

Output

... (truncated)

Sourced from black's changelog.

26.3.1

Stable style

• Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely (#5038)

Configuration

• Always hash cache filename components derived from --python-cell-magics so custom magic names cannot affect cache paths (#5038)

Blackd

• Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure (#5039)

26.3.0

Stable style

• Don't double-decode input, causing non-UTF-8 files to be corrupted (#4964)
• Fix crash on standalone comment in lambda default arguments (#4993)
• Preserve parentheses when # type: ignore comments would be merged with other comments on the same line, preventing AST equivalence failures (#4888)

Preview style

• Fix bug where if guards in case blocks were incorrectly split when the pattern had a trailing comma (#4884)
• Fix string_processing crashing on unassigned long string literals with trailing commas (one-item tuples) (#4929)
• Simplify implementation of the power operator "hugging" logic (#4918)

Packaging

• Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments (#4930)

Performance

• Introduce winloop for windows as an alternative to uvloop (#4996)
• Remove deprecated function uvloop.install() in favor of uvloop.new_event_loop() (#4996)
• Rename maybe_install_uvloop function to maybe_use_uvloop to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop (#4996)

... (truncated)

• c6755bb Prepare release 26.3.1 (#5046)
• 69973fd Harden blackd browser-facing request handling (#5039)
• 4937fe6 Fix some shenanigans with the cache file and IPython (#5038)
• 2e641d1 docs: remove outdated Black Playground references (#5044)
• c014b22 Remove unused internal code (#5041)
• 0dae20b Add new changelog (#5036)
• c5c1cbd Minor release patches (#5035)
• 7e5a828 docs: clarify relationship between Black style and PEP 8 (#5025)
• 69705de docs: add clearer pyproject configuration guidance (#5026)
• 35ea679 Prepare release 26.3.0 (#5032)
• Additional commits viewable in compare view

Sourced from cookiecutter's releases.

Cookiecutter 2.7.1: The One Where It Knows Its Own Name

You know that thing where you release an album, it's on the shelves, people are buying it, and then someone points out the spine says it's your previous album? That's what happened with Cookiecutter 2.7.0. We put out the long-awaited release with 27 improvements and 17 contributors, and cookiecutter -V proudly announced: 2.6.0.

$ cookiecutter -V
Cookiecutter 2.6.0
$ # narrator voice: it was not 2.6.0

Go on, run this and see for yourself that the 2.7.1 release knows its own version number now:

uv tool upgrade cookiecutter

What's fixed

cookiecutter -V now reports the real version. Rather than patch VERSION.txt, this release removes it entirely. The version is now read from package metadata at runtime, so pyproject.toml is the single source of truth and there's nothing left to drift. Thanks @​bollwyvl for the bug report PR and for suggesting the importlib.metadata approach, and thanks @​tranzystorekk for filing #2195!

What's better

CI runs each Python version as its own job. Tests for 3.10 through 3.14 used to run sequentially inside a single job per OS, which pushed Windows past 30 minutes. Each version now runs in parallel with a 15-minute timeout. Windows tests focus on the boundary versions (3.10 and 3.14) since intermediate versions add little signal beyond Ubuntu and macOS.

Contributors

@​audreyfeldroy (Audrey M. Roy Greenfeld) and @​pydanny (Daniel Roy Greenfeld) built this release, with help from Claude roleplaying as David Bowie.

Thanks to @​bollwyvl (Nicholas Bollweg) for the version fix PR and the importlib.metadata suggestion, and @​tranzystorekk for reporting the version mismatch.

2.7.0

Cookiecutter 2.7.0 is tested on Python 3.10 through 3.14, ships with a security policy documenting the trust model for template hook scripts, and publishes to PyPI with cryptographic provenance so you can verify every release. Seventeen contributors from the community helped build it.

uv tool upgrade cookiecutter

What's new

A security policy that explains what you're trusting. Cookiecutter templates can run arbitrary code through hook scripts, and that's by design. The new SECURITY.md lays out the trust model: what Cookiecutter sandboxes (nothing), what's in scope for vulnerability reports, and how to report them privately through GitHub. If you maintain templates or run unfamiliar ones, this is worth reading.

Python 3.10 through 3.14. Full test coverage across five Python versions. If you're on 3.7, 3.8, or 3.9, this is the release where you'll want to upgrade.

Pretty-printed JSON in templates. The jsonify Jinja2 extension takes an indent argument, so you can generate formatted JSON in your templates instead of single-line blobs. Thanks @​pabloxio! (#2050)

Boolean variables from the command line. Pass use_docker=y via --no-input and it arrives as a proper boolean in your template context. Thanks @​tylermilner! (#2029)

Structured bug reports. The GitHub issue form collects environment details upfront, so maintainers can reproduce your issue faster.

Tutorial videos and slides. Conference talk recordings and slide decks linked from the docs. Thanks @​datasharp! (#2137)

... (truncated)

• 083dd3c Release 2.7.1
• 59e7eb1 Ground the runtime version in package metadata instead of a hand-maintained file
• 730d2eb Run each Python version as its own CI job instead of sequentially
• db674d8 Reflect that PyPI publishing runs automatically on tag push
• 718f685 Release 2.7.0
• 14da090 Let contributors focus on what interests them, not a milestone plan
• a4a7e99 Give release managers a safe, documented path from version bump to PyPI
• cf3bd2f Drop the Release Drafter integration
• 0ff1fa8 Tell template creators what Cookiecutter actually gives them
• 154d946 Modernize the README around uv and a leaner project page
• Additional commits viewable in compare view

You can trigger Dependabot actions by commenting on this PR:

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• @dependabot unignore <dependency name> <ignore condition> will remove the ignore condition of the specified dependency and ignore conditions