This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://redirect.github.com/psf/black) ([changelog](https://redirect.github.com/psf/black/blob/main/CHANGES.md)) | `==26.1.0` → `==26.3.1` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.3.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.1.0/26.3.1?slim=true) |

### GitHub Vulnerability Alerts

#### [CVE-2026-32274](https://redirect.github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m)

### Impact

Black writes a cache file, the name of which is computed from various formatting options. The value of the `--python-cell-magics` option was placed in the filename without sanitization, which allowed an attacker who controls the value of this argument to write cache files to arbitrary file system locations. 

### Patches

Fixed in Black 26.3.1.

### Workarounds

Do not allow untrusted user input into the value of the `--python-cell-magics` option.

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.3.1`](https://redirect.github.com/psf/black/blob/HEAD/CHANGES.md#2631)

[Compare Source](https://redirect.github.com/psf/black/compare/26.3.0...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 ([#&#8203;5038](https://redirect.github.com/psf/black/issues/5038))

##### Configuration

- Always hash cache filename components derived from `--python-cell-magics` so custom
  magic names cannot affect cache paths ([#&#8203;5038](https://redirect.github.com/psf/black/issues/5038))

##### *Blackd*

- Disable browser-originated requests by default, add configurable origin allowlisting
  and request body limits, and bound executor submissions to improve backpressure
  ([#&#8203;5039](https://redirect.github.com/psf/black/issues/5039))

### [`v26.3.0`](https://redirect.github.com/psf/black/blob/HEAD/CHANGES.md#2630)

[Compare Source](https://redirect.github.com/psf/black/compare/26.1.0...26.3.0)

##### Stable style

- Don't double-decode input, causing non-UTF-8 files to be corrupted ([#&#8203;4964](https://redirect.github.com/psf/black/issues/4964))
- Fix crash on standalone comment in lambda default arguments ([#&#8203;4993](https://redirect.github.com/psf/black/issues/4993))
- Preserve parentheses when `# type: ignore` comments would be merged with other
  comments on the same line, preventing AST equivalence failures ([#&#8203;4888](https://redirect.github.com/psf/black/issues/4888))

##### Preview style

- Fix bug where `if` guards in `case` blocks were incorrectly split when the pattern had
  a trailing comma ([#&#8203;4884](https://redirect.github.com/psf/black/issues/4884))
- Fix `string_processing` crashing on unassigned long string literals with trailing
  commas (one-item tuples) ([#&#8203;4929](https://redirect.github.com/psf/black/issues/4929))
- Simplify implementation of the power operator "hugging" logic ([#&#8203;4918](https://redirect.github.com/psf/black/issues/4918))

##### Packaging

- Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in
  frozen environments ([#&#8203;4930](https://redirect.github.com/psf/black/issues/4930))

##### Performance

- Introduce winloop for windows as an alternative to uvloop ([#&#8203;4996](https://redirect.github.com/psf/black/issues/4996))
- Remove deprecated function `uvloop.install()` in favor of `uvloop.new_event_loop()`
  ([#&#8203;4996](https://redirect.github.com/psf/black/issues/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
  ([#&#8203;4996](https://redirect.github.com/psf/black/issues/4996))

##### Output

- Emit a clear warning when the target Python version is newer than the running Python
  version, since AST safety checks cannot parse newer syntax. Also replace the
  misleading "INTERNAL ERROR" message with an actionable error explaining the version
  mismatch ([#&#8203;4983](https://redirect.github.com/psf/black/issues/4983))

##### *Blackd*

- Introduce winloop to be used when windows in use which enables blackd to run faster on
  windows when winloop is installed. ([#&#8203;4996](https://redirect.github.com/psf/black/issues/4996))

##### Integrations

- Remove unused gallery script ([#&#8203;5030](https://redirect.github.com/psf/black/issues/5030))
- Harden parsing of `black` requirements in the GitHub Action when `use_pyproject` is
  enabled so that only version specifiers are accepted and direct references such as
  `black @&#8203; https://...` are rejected. Users should upgrade to the latest version of the
  action as soon as possible. This update is received automatically when using
  `psf/black@stable`, and is independent of the version of Black installed by the
  action. ([#&#8203;5031](https://redirect.github.com/psf/black/issues/5031))

##### Documentation

- Expand preview style documentation with detailed examples for `wrap_comprehension_in`,
  `simplify_power_operator_hugging`, and `wrap_long_dict_values_in_parens` features
  ([#&#8203;4987](https://redirect.github.com/psf/black/issues/4987))
- Add detailed documentation for formatting Jupyter Notebooks ([#&#8203;5009](https://redirect.github.com/psf/black/issues/5009))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

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---

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🤖 I have created a release *beep* *boop*
---


## [0.0.54](v0.0.53...v0.0.54) (2026-03-12)


### Bug Fixes

* **deps:** Update dependency black to v26.3.1 [SECURITY] ([#213](#213)) ([9480fe7](9480fe7))

---
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