Release Notes Released on 2026-09-15. This release fixes a regression in 0.12.14 that lead to rejecting valid installation commands such as using uv pip install --system in python:* docker images or when using uv pip install --target .. (#21699) Performance Speed up cold-cache resolution and HTTP cache revalidation by batching cache writes (#21675) Bug fixes Revert "Reject symlinked wheel installa…
Release Notes Released on 2026-09-15. Package-operation errors now use uv's standard diagnostics, with consistent hints and compact, labeled cause chains. (#17110, #21599, #21603) Package-operation exit codes now reflect the underlying cause: expected failures return 1, while recognized operational and internal failures return 2. (#17110) Enhancements Resume interrupted downloads with HTTP Range r…
Release Notes Released on 2026-09-10. Python Add GraalPy 3.13.0 (#21431) Enhancements Verify hashes when downloading PEP 658 metadata sidecars (#21563) Preview features Respect ty exclusions when uv check automatically selects members of a virtual workspace (#21555) Performance Avoid full wheel downloads during resolution by reusing supported hashes from direct URL fragments when metadata is avail…
Release Notes Released on 2026-09-09. The executables in our macOS and Windows release archives and uv and uv_build wheels are now code-signed. macOS executables are signed with an Apple Developer ID certificate and notarized by Apple. Windows executables have timestamped Authenticode signatures from Azure Artifact Signing. This enables verification of the release publisher and binary integrity, s…
Release Notes Released on 2026-09-08. Preview features Generate missing artifact hashes when exporting pylock.toml files to ensure they conform to PEP 751 (#20146) Warn when pylock.toml artifact hash tables are empty, which will be rejected in a future uv release (#21462) Performance Speed up installs that overwrite existing files by eliminating per-file temporary directories for atomic hard-link,…
Release Notes Released on 2026-09-04. Enhancements Attempt to revoke short-lived PyPI trusted-publishing tokens after uv publish completes, including when publishing fails (#21423) Preview features Omit exclude-newer-package settings for packages outside the resolution from uv.lock with the missing-exclude-newer-package-lock preview feature (#21455) Show terminal dependency cycles in uv tree --inv…
Release Notes Released on 2026-09-01. Python Add CPython 3.15.0rc2 (#21413, #21415) Enhancements Add --no-locked and --no-frozen to disable lock modes enabled by UV_LOCKED and UV_FROZEN for a single invocation (#21408) Report the exact command-line lock-mode flag in warnings and errors (#21402) Performance Speed up cold wheel installs by extracting each streaming ZIP archive in a single blocking t…
Release Notes Released on 2026-08-31. Enhancements Warn about invalid tool directories and continue upgrading valid tools with uv tool upgrade --all (#21368) Preview features Deduplicate identical files within and across cached wheels with the content-addressed-cache preview feature (#21327) Reduce allocations while extracting content-addressed wheels by reusing the hashing buffer across files (#2…
Release Notes Released on 2026-08-27. Python Replace managed Python installations when upgrading to a newer build of the same version (#21323) Enhancements Support Linux s390x, ppc64le, and loongarch64 targets for cross-platform dependency resolution (#21313) Retry downloads with configured credentials when Azure Storage denies anonymous access to an endpoint configured via UV_AZURE_ENDPOINT_URL (…
Release Notes Released on 2026-08-25. Python Update CPython to use OpenSSL 3.5.8 and libffi 3.4.8 #21295) Enhancements Report cache-cleaning space savings from filesystem block allocation and avoid double-counting hard links (#21261) Limit warnings about unbounded uv_build requirements to source-distribution builds (#21078) Display byte counts below 1 KiB without a fractional part (#21237) Preview…
Release Notes Released on 2026-08-14. Python Add CPython 3.10.21, 3.11.16, and 3.12.14 (#21138) Prefer newer versions and standard variants when selecting between equally prioritized Python interpreters (#21134) Enhancements Simplify errors and hints for invalid editable requirements, and redact credentials in requirement URLs (#21130) Preview features Allow --index and --default-index to select c…
Release Notes Released on 2026-08-13. Enhancements Prefer post-quantum key exchange and enable opt-in TLS diagnostics (#21054) Accept whitespace before versions in noncompliant wildcard comparisons such as Requires-Python: >= 3.5.* (#21012) Report a specific error when a PEP 723 closing tag contains trailing whitespace or other content (#20944) Omit source-span carets from diagnostics for empty PE…
Release Notes Released on 2026-08-07. Python Add CPython 3.13.15 (#20997) Preview features Add --output-format to select automatic, human-readable, or raw-byte output for uv cache size (#20992) Preserve JSON output from uv workspace metadata --quiet while suppressing diagnostics (#20991) Reduce memory usage for large workspaces by streaming uv workspace metadata JSON output (#20990) Performance Re…
Release Notes Released on 2026-08-05. Python Add CPython 3.15.0rc1 (#20948) Add CPython 3.14.7 (#20971) Enhancements Ensure diagnostic hints end with a newline to prevent malformed terminal output (#20959) Preview features Audit one or all installed tools with uv tool audit (#20921) Report physically reclaimed disk space during cache cleanup with the cache-physical-space preview feature (#20925) C…
Release Notes Released on 2026-07-31. Enhancements Add package-specific pre-release policies with --prerelease-package (#20837) Support local HTML files as flat indexes (#20802) Add Xonsh virtual environment activation scripts (activate.xsh) (#19740) Preserve filesystem paths passed to uv add --index when updating pyproject.toml (#20817) Preview features Add automatic fixes to uv check with --fix…
Release Notes Released on 2026-07-28. Since we released uv 0.11.0 in March, we've accumulated changes that improve correctness, safety, and compatibility with specifications, but could break some workflows. This release contains those changes; many have been marked as breaking out of an abundance of caution. We expect most users to be able to upgrade without making changes. There are no breaking c…
Release Notes Released on 2026-07-28. Enhancements Abort panics in release builds for smaller uv binaries (#20271) Use .tar.gz archives for Pyodide installs (#20667) Preview features Avoid checking any scripts in uv check unless --script is passed (#20676) Check locked tools for malware before cache reuse (#20301) Write and read package.metadata-free lockfiles (#20688, #20691, #20685, #20695) Bug…
Release Notes Released on 2026-07-23. Preview features Add --package and --all-packages selection to uv check (#20628) Allow uv upgrade to update multiple marker-specific declarations of the same package (#20335) Reject non-canonically formatted lockfiles in uv lock --check and commands using --locked (#20646) Regenerate non-canonically formatted lockfiles with uv lock --refresh (#20634) Include b…
Release Notes Released on 2026-07-21. Enhancements Allow workspace sources to reference members in another workspace by path (#18401) Support .venv files containing paths to centralized project environments (#20022) Update bundled Windows timezone data to IANA 2026c (#20554) Preview features Add an index-specific hash-algorithm setting for lockfile generation (#20605) Configuration Add audit.malwa…
Release Notes Released on 2026-07-20. Python Add CPython 3.15.0b4 (#20519) Preview features Allow uv workspace metadata --sync to target the active virtual environment with --active (#20500) Reuse centralized project environments when workspaces are accessed through symlinks (#20436) Performance Skip resolver candidates whose files are all excluded by exclude-newer (#20460) Limit parallel cache re…
Release Notes Released on 2026-07-15. Python Use gzip-compressed artifacts for PyPy downloads (#20265) Enhancements Add JSON output to uv tree (#19978) Add CUDA 13.2 as a supported PyTorch backend (#20267) Prefer local artifacts over URLs when installing from pylock.toml (#20393) Clarify diagnostics for unsatisfiable direct requirement ranges (#20227) Include the selected project name in missing-e…
Release Notes Released on 2026-07-07. Security This release updates our ZIP library, astral-async-zip, to v0.0.20, which includes 15 changes that harden our ZIP handling against parser differentials. uv may reject ZIP archives with malformed or ambiguous content that were previously accepted. See the upstream commits for a full list of changes. Python Upgrade GraalPy to 25.1.3 (#20069) Enhancement…
Release Notes Released on 2026-07-06. Enhancements Continue on ignored errors when fetching wheel metadata (#12255) Use caching for --python-downloads-json-url (#16749) Preview features Discover extensionless shebang scripts in uv workspace list --scripts (#20099) Performance Avoid full site-packages scans for direct reinstalls (#20119) Avoid redundant pyproject parsing (#20076) Cache default depe…
Release Notes Released on 2026-06-30. Performance Adapt uv to IDs-only PubGrub dependencies (#20048) Avoid allocations in ForkMap::contains (#20023) Reuse resolver work across PubGrub iterations (#20020) Speed up candidate selection for disjoint ranges (#20026) Bug fixes Warn when the build cache is inside the source directory (#20056) Install uv 0.11.26 Install prebuilt binaries via shell script…
Release Notes Released on 2026-06-26. Security This release updates our tar library, astral-tokio-tar, to v0.6.3, which includes over 20 changes that harden our tar handling against parser differentials. uv may reject source distributions with malformed or ambiguous content that were previously accepted. See the upstream commits for a full list of changes. Enhancements Add a full "lockfile" to too…
Release Notes Released on 2026-06-23. Python Add CPython 3.15.0b3 (#19964) Preview features Make project environments relocatable under preview (#19965) Performance Use a compact index for lazy version maps (#19959) Bug fixes Allow disabling exclude-newer (#19934) Avoid archive id collisions (#19949) Reapply "Fix transparent Python upgrades in project environments" (#19928) Clean up partial tool e…
Release Notes Released on 2026-06-19. Bug fixes Revert "Fix transparent Python upgrades in project environments" to mitigate unintended breakage in pre-commit-uv (#19925) Restore old behavior where workspace members "hidden" by an intermediate pyproject.toml would be treated as standalone projects (#19926) Install uv 0.11.23 Install prebuilt binaries via shell script curl --proto '=https' --tlsv1.…
Release Notes Released on 2026-06-18. Enhancements Publish wheels before sdists in uv publish (#19831) Add TY and RUFF env vars for providing paths for binaries used by uv format and uv check (#19821) Preview features Allow configuring preview features in uv.toml and pyproject.toml (#18437) Update the lockfile during uv check --no-sync (#19909) Add --script to uv check and uv metadata (#19860) Rep…
Release Notes Released on 2026-06-11. Python Add CPython 3.13.14 and 3.14.6 (#19787) Preview features Add environment.root to uv workspace metadata --sync (#19760) Allow uv upgrade to update a single dependency constraint (#19738) Compute and pass uv workspace metadata payload in ty check (#19763) Make packaged applications the default for uv init (#17841) Performance Add parallel discovery of Pyt…
Release Notes Released on 2026-06-10. Enhancements Add --emit-index-url and --emit-find-links to uv export (#18370) Add --find-links support for uv pip list (#16103) Group executable install errors during uv python install (#19691) Use ICF in macOS release builds to reduce binary sizes (#19615) Preview features Add initial hidden uv upgrade command (#19678) Reject Git revisions in uv upgrade (#197…