# uv 0.12.9

- Product: uv (https://whatsnew.fyi/product/uv)
- Vendor: uv
- Date: 2026-09-01
- Version: 0.12.9
- Original notes: https://github.com/astral-sh/uv/releases/tag/0.12.9
- Permalink: https://whatsnew.fyi/product/uv/releases/0.12.9

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.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **added** — Add CPython 3.15.0rc2
- **added** — Add `--no-locked` and `--no-frozen` flags to disable lock modes enabled by `UV_LOCKED` and `UV_FROZEN` for a single invocation
- **changed** — Report the exact command-line lock-mode flag in warnings and errors
- **changed** — Speed up cold wheel installs by extracting each streaming ZIP archive in a single blocking task and reusing buffers across files
- **fixed** — Update `async_http_range_reader` to 0.11.1 to address a potential memory-safety issue when reading metadata ranges from untrusted wheels
- **fixed** — Remove sensitive headers when redirects cross authentication realms, including same-host redirects that change URL schemes
- **fixed** — Redact secrets in signed URLs from retry diagnostics, including nested request errors
- **fixed** — Give `--locked`, `--frozen`, `--check`, and `--check-exists` precedence over conflicting `UV_LOCKED` and `UV_FROZEN` values
- **fixed** — Prevent concurrent uv processes from redundantly extracting the same local or source-built wheel

##### Release Notes

Released on 2026-09-01.

###### Python

- Add CPython 3.15.0rc2 ([#21413](https://github.com/astral-sh/uv/pull/21413), [#21415](https://github.com/astral-sh/uv/pull/21415))

###### Enhancements

- Add `--no-locked` and `--no-frozen` to disable lock modes enabled by `UV_LOCKED` and `UV_FROZEN` for a single invocation ([#21408](https://github.com/astral-sh/uv/pull/21408))
- Report the exact command-line lock-mode flag in warnings and errors ([#21402](https://github.com/astral-sh/uv/pull/21402))

###### Performance

- Speed up cold wheel installs by extracting each streaming ZIP archive in a single blocking task and reusing buffers across files ([#21372](https://github.com/astral-sh/uv/pull/21372))

###### Bug fixes

- Update `async_http_range_reader` to 0.11.1 to address a potential memory-safety issue when reading metadata ranges from untrusted wheels ([#21401](https://github.com/astral-sh/uv/pull/21401))
- Remove sensitive headers when redirects cross authentication realms, including same-host redirects that change URL schemes ([#21382](https://github.com/astral-sh/uv/pull/21382))
- Redact secrets in signed URLs from retry diagnostics, including nested request errors ([#21381](https://github.com/astral-sh/uv/pull/21381))
- Give `--locked`, `--frozen`, `--check`, and `--check-exists` precedence over conflicting `UV_LOCKED` and `UV_FROZEN` values ([#21396](https://github.com/astral-sh/uv/pull/21396))
- Prevent concurrent uv processes from redundantly extracting the same local or source-built wheel ([#21400](https://github.com/astral-sh/uv/pull/21400))

##### Install uv 0.12.9

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-installer.ps1 | iex"
```

##### Download uv 0.12.9

|  File  | Platform | Checksum |
|--------|----------|----------|
| [uv-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-aarch64-apple-darwin.tar.gz.sha256) |
| [uv-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-x86_64-apple-darwin.tar.gz.sha256) |
| [uv-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-aarch64-pc-windows-msvc.zip.sha256) |
| [uv-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-i686-pc-windows-msvc.zip.sha256) |
| [uv-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-x86_64-pc-windows-msvc.zip.sha256) |
| [uv-aarch64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [uv-i686-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.9/uv-i686-unknown-linux-gnu.tar.gz.sha256) |
| [uv-powerpc64le-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/u

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/uv/releases/tag/0.12.9]_