Release Notes

Released on 2025-10-21.

This release contains an upgrade to astral-tokio-tar, which addresses a vulnerability in tar extraction on malformed archives with mismatching size information between the ustar header and PAX extensions. While the astral-tokio-tar advisory has been graded as "high" due its potential broader impact, the specific impact to uv is low due to a lack of novel attacker capability. Specifically, uv only processes tar archives from source distributions, which already possess the capability for full arbitrary code execution by design, meaning that an attacker gains no additional capabilities through astral-tokio-tar.

Regardless, we take the hypothetical risk of parser differentials very seriously. Out of an abundance of caution, we have assigned this upgrade an advisory: GHSA-w476-p2h3-79g9

Security

• Upgrade astral-tokio-tar to 0.5.6 to address a parsing differential (#16387)

Enhancements

• Add required environment marker example to hint (#16244)
• Fix typo in MissingTopLevel warning (#16351)
• Improve 403 Forbidden error message to indicate package may not exist (#16353)
• Add a hint on uv pip install failure if the --system flag is used to select an externally managed interpreter (#16318)

Bug fixes

• Fix backtick escaping for PowerShell (#16307)

Documentation

• Document metadata consistency expectation (#15683)
• Remove outdated aarch64 musl note (#16385)

Install uv 0.9.5

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.5/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.5/uv-installer.ps1 | iex"

Download uv 0.9.5

Release Notes

Released on 2025-10-17.

Enhancements

• Add CUDA 13.0 support (#16321)
• Add auto-detection for Intel GPU on Windows (#16280)
• Implement display of RFC 9457 HTTP error contexts (#16199)

Bug fixes

• Avoid obfuscating pyx tokens in uv auth token output (#16345)

Install uv 0.9.4

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.4/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.4/uv-installer.ps1 | iex"

Download uv 0.9.4

Release Notes

Released on 2025-10-14.

Python

• Add CPython 3.15.0a1
• Add CPython 3.13.9

Enhancements

• Obfuscate secret token values in logs (#16164)

Bug fixes

• Fix workspace with relative pathing (#16296)

Install uv 0.9.3

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.3/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.3/uv-installer.ps1 | iex"

Download uv 0.9.3

Release Notes

Released on 2025-10-10.

Python

• Add CPython 3.9.24.
• Add CPython 3.10.19.
• Add CPython 3.11.14.
• Add CPython 3.12.12.

Enhancements

• Avoid inferring check URLs for pyx in uv publish (#16234)
• Add uv tool list --show-python (#15814)

Documentation

• Add missing "added in" to new environment variables in reference (#16217)

Install uv 0.9.2

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.2/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.2/uv-installer.ps1 | iex"

Download uv 0.9.2

Release Notes

Released on 2025-10-09.

Enhancements

• Log Python choice in uv init (#16182)
• Fix pylock.toml config conflict error messages (#16211)

Configuration

• Add UV_UPLOAD_HTTP_TIMEOUT and respect UV_HTTP_TIMEOUT in uploads (#16040)
• Support UV_WORKING_DIRECTORY for setting --directory (#16125)

Bug fixes

• Allow missing Scripts directory (#16206)
• Fix handling of Python requests with pre-releases in ranges (#16208)
• Preserve comments on version bump (#16141)
• Retry all HTTP/2 errors (#16038)
• Treat deleted Windows registry keys as equivalent to missing ones (#16194)
• Ignore pre-release Python versions when a patch version is requested (#16210)

Documentation

• Document why uv discards upper bounds on requires-python (#15927)
• Document uv version environment variables were added in (#15196)

Install uv 0.9.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.1/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.1/uv-installer.ps1 | iex"

Download uv 0.9.1

Release Notes

Released on 2025-10-07.

This breaking release is primarily motivated by the release of Python 3.14, which contains some breaking changes (we recommend reading the "What's new in Python 3.14" page). uv may use Python 3.14 in cases where it previously used 3.13, e.g., if you have not pinned your Python version and do not have any Python versions installed on your machine. While we think this is uncommon, we prefer to be cautious. We've included some additional small changes that could break workflows.

See our Python 3.14 blog post for some discussion of features we're excited about!

There are no breaking changes to uv_build. If you have an upper bound in your [build-system] table, you should update it.

Breaking changes

• Python 3.14 is now the default stable version

  The default Python version has changed from 3.13 to 3.14. This applies to Python version installation when no Python version is requested, e.g., uv python install. By default, uv will use the system Python version if present, so this may not cause changes to general use of uv. For example, if Python 3.13 is installed already, then uv venv will use that version. If no Python versions are installed on a machine and automatic downloads are enabled, uv will now use 3.14 instead of 3.13, e.g., for uv venv or uvx python. This change will not affect users who are using a .python-version file to pin to a specific Python version.

• Allow use of free-threaded variants in Python 3.14+ without explicit opt-in (#16142)

  Previously, free-threaded variants of Python were considered experimental and required explicit opt-in (i.e., with 3.14t) for usage. Now uv will allow use of free-threaded Python 3.14+ interpreters without explicit selection. The GIL-enabled build of Python will still be preferred, e.g., when performing an installation with uv python install 3.14. However, e.g., if a free-threaded interpreter comes before a GIL-enabled build on the PATH, it will be used. This change does not apply to free-threaded Python 3.13 interpreters, which will continue to require opt-in.

• Use Python 3.14 stable Docker images (#16150)

  Previously, the Python 3.14 images had an -rc suffix, e.g., python:3.14-rc-alpine or
  python:3.14-rc-trixie. Now, the -rc suffix has been removed to match the stable
  upstream images. The -rc images tags will no longer be
  updated. This change should not break existing workflows.

• Upgrade Alpine Docker image to Alpine 3.22

  Previously, the uv:alpine Docker image was based on Alpine 3.21. Now, this image is based on Alpine 3.22. The previous image can be recovered with uv:alpine3.21 and will continue to be updated until a future release.

• Upgrade Debian Docker images to Debian 13 "Trixie"

  Previously, the uv:debian and uv:debian-slim Docker images were based on Debian 12 "Bookworm". Now, these images are based on Debian 13 "Trixie". The previous images can be recovered with uv:bookworm and uv:bookworm-slim and will continue to be updated until a future release.

• Fix incorrect output path when a trailing / is used in uv build (#15133)

  When using uv build in a workspace, the artifacts are intended to be written to a dist directory in the workspace root. A bug caused workspace root determination to fail when the input path included a trailing / causing the dist directory to be placed in the child directory. This bug has been fixed in this release. For example, uv build child/ is used, the output path will now be in <workspace root>/dist/ rather than <workspace root>/child/dist/.

Python

• Add CPython 3.14.0
• Add CPython 3.13.8

Enhancements

• Don't warn when a dependency is constrained by another dependency (#16149)

Bug fixes

• Fix uv python upgrade / install output when there is a no-op for one request (#16158)
• Surface pinned-version hint when uv tool upgrade can’t move the tool (#16081)
• Ban pre-release versions in uv python upgrade requests (#16160)
• Fix uv python upgrade replacement of installed binaries on pre-release to stable (#16159)

Documentation

• Update uv pip compile args in layout.md (#16155)

Install uv 0.9.0

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.0/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.0/uv-installer.ps1 | iex"

Download uv 0.9.0

Release Notes

Released on 2025-10-06.

Enhancements

• Emit a message on cache clean and prune when lock is held (#16138)
• Add --force flag for uv cache prune (#16137)

Documentation

• Fix example of bumping beta version without patch bump (#16132)

Install uv 0.8.24

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.8.24/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.8.24/uv-installer.ps1 | iex"

Download uv 0.8.24

Release Notes

Released on 2025-10-03.

Enhancements

• Build s390x on stable Rust compiler version (#16082)
• Add UV_SKIP_WHEEL_FILENAME_CHECK to allow installing invalid wheels (#16046)

Bug fixes

• Avoid rejecting already-installed URL distributions with --no-sources (#16094)
• Confirm that the directory name is a valid Python install key during managed check (#16080)
• Ignore origin when comparing installed tools (#16055)
• Make cache control lookups robust to username (#16088)
• Re-order lock validation checks by severity (#16045)
• Remove tracking of inferred dependency conflicts (#15909)
• Respect --no-color on the CLI (#16044)
• Deduplicate marker-specific dependencies in uv pip tree output (#16078)

Documentation

• Document transparent x86_64 emulation on aarch64 (#16041)
• Document why we ban URLs from index dependencies (#15929)
• Fix rendering of _CONDA_ROOT in reference (#16114)
• Windows arm64 and Linux RISC-V64 are Tier 2 supported (#16027)

Install uv 0.8.23

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.8.23/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.8.23/uv-installer.ps1 | iex"

Download uv 0.8.23

Release Notes

Released on 2025-09-23.

Python

• Upgrade Pyodide to 0.28.3 (#15999)

Security

• Upgrade astral-tokio-tar to 0.5.5 which hardens tar archive extraction (#16004)

Install uv 0.8.22

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.8.22/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.8.22/uv-installer.ps1 | iex"

Download uv 0.8.22

Release Notes

+Released on 2025-09-23.

Enhancements

• Refresh lockfile when --refresh is provided (#15994)

Preview features

Add support for S3 request signing (#15925)

Install uv 0.8.21

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.8.21/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.8.21/uv-installer.ps1 | iex"

Download uv 0.8.21