Changelog#

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to semantic versioning in the MAJOR.MINOR.PATCH format.

26.10.2 (2026-11-03)#

Bug fixes#

  • Handle pip-installed package records without download URLs and retain them when removing unrelated packages with pip interoperability enabled. (#211)

Docs#

  • Remove custom multichannels from the known limitations documentation now that multichannel support landed in #182. (#209)

Other#

  • Run test_install_keeps_unrequested_history_packages with CONDA_CHANNEL_PRIORITY=flexible so it also passes on hosts configured with strict channel priority. (#207)

Contributors#

  • @danyeaw

  • @jezdez

  • @dependabot[bot]

26.10.1 (2026-11-02)#

Other#

  • Re-release the 26.10.0 changes as 26.10.1, because the 26.10.0 GitHub release was published before its release workflow could attach the distributions. Published releases are immutable, so 26.10.0 could not be completed and never reached PyPI. (#206)

  • Add the conda-canary/label/dev channel to canary builds so run dependencies can be pinned against the newest conda-rattler-solver canary. (#206)

Contributors#

  • @danyeaw

26.10.0 (2026-11-02)#

Enhancements#

  • Pass root_extras to conda’s build_repodata_subset so sharded repodata fetching retrieves only the root-level extras (extra_depends groups) requested by the user, whether in the current request or recorded in the environment history. Extras of dependencies are not traversed, and history is ignored when pruning. Requires conda>=26.10 and py-rattler>=0.27; older versions do not fetch extras. (#155)

  • Add multichannel support. conda’s defaults, conda-build’s local, and condarc’s custom_multichannels are passed to the solver as rattler.MultiSource groups. Members of a group share a channel priority tier, and specs naming the multichannel (e.g. defaults::python) can match any member. (#8 via #182)

Bug fixes#

  • Avoid unnecessary build downgrades during updates while allowing dependency downgrades required to satisfy pins or package requirements. Newer versions can still reset their build numbers to zero. (#126)

  • When updating an environment, retry solves with looser constraints on package dependencies to avoid unsatisfiable errors, for example after changing channel configuration. (#135 via #165)

  • Keep dependencies of explicitly requested extras (e.g. pkg[extras=cli]) when pruning. (#184)

  • Preserve downgrade protections during the second solve for conda update --update-deps. (#185)

  • Preserve packages from environment history during frozen installs. Keep compatible installed records when channel candidates have unsatisfied dependencies. (#187)

Docs#

  • Set up the documentation website. (#161 via #196)

Other#

  • Add a pytest-conda-solvers GitHub Actions workflow. (#103)

  • Fix test_pytorch_gpu by installing the nvidia-virtual-packages conda plugin and setting CONDA_OVERRIDE_CUDA_ARCH, because recent conda-forge CUDA builds require the __cuda_arch virtual package. (#176)

  • Support py-rattler 0.27 alongside 0.26. (#180)

  • Raise the minimum supported py-rattler version to 0.27.1 in the Python package, conda recipe, and Pixi workspace. (#198 via #199)

  • Support py-rattler 0.28.0 and its new build-string API, while retaining support for 0.26 and 0.27. (#187)

  • Require py-rattler >=0.28.1,<0.29.0a0 in the Python package, conda recipe, and Pixi workspace, which raises the minimum above 0.27.1 and includes py-rattler’s updated ZIP dependency. (#201)

  • Add tests covering specs combining versions with extras. (#175)

Contributors#

  • @agriyakhetarpal

  • @dholth

  • @jezdez

  • @kenodegard

  • @ryanskeith

  • @soapy1

  • @travishathaway

  • @conda-bot

  • @dependabot[bot]

  • @h-vetinari made their first contribution in conda/conda-rattler-solver#180

0.2.0 (2026-09-16)#

Enhancements#

  • Publish releases to PyPI with trusted publishing and artifact attestations. (#83 via #109)

  • Suggest updating conda with conda self if conda self plugin is installed. (#96)

  • Map conda’s flexible channel priority to rattler’s Flexible mode, instead of falling back to Disabled. Solves under the default priority setting now prefer higher-priority channels, matching classic and libmamba solver behaviour. (#125 via #152)

Bug fixes#

  • Preserve the installed conda package and its Python requirements during conda update python, while honoring explicit Python pins and allowing conda to change when requested or needed to resolve a dependency conflict. (#100 via #137)

  • Support searching channels with sharded repodata as part of RattlerIndexHelper. (#111)

  • Fix conda update --all so Python is updated within the current major.minor series (e.g. 3.13.9 → 3.13.14), matching classic solver behavior. (#112 via #113)

  • Fix MatchSpec conversion for package extras, using py-rattler’s support for quoted extras. (#94 via #117 and #123)

  • Honor add_pip_as_python_dependency across normal, sharded, and offline repodata sources. (#122)

  • Prevent updates from selecting package versions older than those already installed. (#126)

  • Retain installed packages that are unavailable from configured channels during updates. (#88 via #129)

  • Load v3 package records from sharded channels via iter_records_v3(), fixing installs from v3-native channels. (#92 via #66)

  • Fix InvalidMatchSpec errors being raised when parsing rattler solver diagnostics that reference requested extras. (#154)

Deprecations#

  • Require Python 3.11 or newer for conda packages to match py-rattler’s conda-forge builds. (#123)

Docs#

  • Document installation and opt-in use of the beta solver. (#74)

  • Document running and adding benchmarks, and link to Bencher results. (#144)

  • Switch to using the new on-demand release process. (#80)

Other#

  • Require py-rattler >=0.26.0,<0.27.0a0. (#123)

  • Track solver and index benchmarks with Bencher. (#144)

  • Require conda >=26.7.0 for the shards iter_records_v3() API. (#66)

  • Fix tests failing locally by using conda-pypi for editable installs. (#82)

  • Enable infrastructure-managed Dependabot configuration via conda/infrastructure templates. (#84)

  • Add solve-time benchmarks comparing rattler vs libmamba for small, medium, and large environments, including conflict and cold/warm cache cases. (#118)

Contributors#

0.1.1 (2026-06-11)#

Enhancements#

  • Bump py-rattler to >=0.25.0,<0.26.0a0 to restore ppc64le support for the conda-forge build of conda. (#69)

Bug fixes#

  • Raise the conda-build-specific exception when solver problems are inferred, so conda-build receives the expected error type instead of a generic conflict. (#65)

Other#

  • Update the conda dependency to conda >=26.5.0 and correct the 0.1.0 release date in the changelog. (#63, #64)

Contributors#

0.1.0 (2026-05-16)#

  • Bump conda dependency to 26.5.0 by @soapy1 #61

  • Enable conditional dependencies and extras for user input by @jaimergp in #28

  • Handle PackagesNotFoundInChannelsError introduced in conda v26.3.0 by @soapy1 in #54

  • Add support for sharded repodata (v3) via conda’s repodata_use_shards config by @soapy1 in #53

  • CI: Build and upload noarch packages by @soapy1 in #56

  • CI: Fix Windows canary build test syntax by @jezdez in #57

  • CI: Build canary on linux-64 only (noarch package) by @jezdez in #59

0.0.6 (2026-03-16)#

  • Bump to py-rattler 0.23 by @jaimergp in #43

0.0.5 (2026-01-23)#

  • Update legacy_bz2_size to integer type by @dholth in #38

  • Prevent non-requested updates of transitive dependencies by @jaimergp in #39

  • Bump to py-rattler>=0.21 and default to PREFER_CONDA_WITH_WHL by @jaimergp in #40

0.0.4 (2026-01-20)#

  • Use conda>=25.5.0, py-rattler>=0.20, python>=3.10 by @jaimergp in #23

  • Do not report “not found” packages as missing if already installed by @jaimergp in #25

  • Prettify output, tidy up comments, add docstrings by @jaimergp in #26

  • Update some deprecated imports by @jaimergp in #31

  • Fix Python version changes fast-tracking by @jaimergp in #27

  • CI: Update and pin GHA actions versions by @jaimergp in #24

  • CI: Fix CI matrix for macOS by @jaimergp in #31

  • CI: Update tests workflow from conda/conda by @jaimergp in #33

  • CI: Bump setup-miniconda and remove xonsh workarounds by @jaimergp in #34

  • CI: Use macos-15-intel by @jaimergp in #17

0.0.3 (2025-05-25)#

  • Use new APIs in SparseRepoData (.record_count() and PackageFormatSelection enum) by @jaimergp in #12

  • Implements .search() with SparseRepoData.load_matching_records() by @jaimergp in #13

  • Use .record_count() from py-rattler 0.13.1 by @jaimergp in #14

  • Add conda-build recipe, fix version logic by @jaimergp in #15

0.0.2 (2025-05-21)#

  • Convert records without temporary JSON file by @jaimergp in #11

0.0.1 (2025-05-20)#

Prototype release. Not meant for production.

Passes most of the test suite, except for:

  • defaults::package does not work

  • Some channel priority differences when mixing channels

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