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| 1 | +## 2026.04.07 |
| 2 | + |
| 3 | +Release: 2.6.0.rc0 (libmamba, mamba, micromamba, libmambapy) |
| 4 | + |
| 5 | +Enhancements: |
| 6 | + |
| 7 | +- [micromamba, libmamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in <https://github.com/mamba-org/mamba/pull/4214> |
| 8 | +- [libmamba] feat: Introduce `MatchSpec::extract_name` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4206> |
| 9 | +- [libmamba] feat: Optimize `PackageInfo` descending sorts by @jjerphan in <https://github.com/mamba-org/mamba/pull/4208> |
| 10 | +- [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in <https://github.com/mamba-org/mamba/pull/4190> |
| 11 | +- [libmamba] feat: Parse optional fields for `ShardPackageRecord` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4195> |
| 12 | +- [libmamba] feat: Support `track_features` for `ShardRecord` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4192> |
| 13 | +- [libmamba] feat: Shard Caching by @jjerphan in <https://github.com/mamba-org/mamba/pull/4174> |
| 14 | +- [micromamba, libmamba] feat: Do not warn for missing channels index by @jjerphan in <https://github.com/mamba-org/mamba/pull/4189> |
| 15 | +- [all] build: Export `libmamba-spdlog` target for building dependencies in tree by @opoplawski in <https://github.com/mamba-org/mamba/pull/4172> |
| 16 | +- [libmamba] feat: Sharded Repodata by @jjerphan in <https://github.com/mamba-org/mamba/pull/4162> |
| 17 | +- [libmamba] feat: Support `MSGPACK_OBJECT_ARRAY` for hashes by @jjerphan in <https://github.com/mamba-org/mamba/pull/4167> |
| 18 | +- [micromamba, libmamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in <https://github.com/mamba-org/mamba/pull/4163> |
| 19 | +- [libmamba] feat: Consider `emscripten` a UNIX platform by @jjerphan in <https://github.com/mamba-org/mamba/pull/4168> |
| 20 | +- [libmamba] feat: Shard Traversal by @jjerphan in <https://github.com/mamba-org/mamba/pull/4161> |
| 21 | +- [libmamba] feat: ShardIndexLoader by @jjerphan in <https://github.com/mamba-org/mamba/pull/4149> |
| 22 | +- [libmamba] feat: Shards by @jjerphan in <https://github.com/mamba-org/mamba/pull/4148> |
| 23 | +- [libmamba, libmambapy] feat: Shard types and utils by @jjerphan in <https://github.com/mamba-org/mamba/pull/4145> |
| 24 | +- [micromamba, libmamba] feat: Support Prefix Data Interoperability by @jjerphan in <https://github.com/mamba-org/mamba/pull/4123> |
| 25 | + |
| 26 | +Bug fixes: |
| 27 | + |
| 28 | +- [micromamba, libmamba] config sub-command output hides secrets by @Klaim in <https://github.com/mamba-org/mamba/pull/4223> |
| 29 | +- [micromamba, libmamba] fix: Minor adaptations for sharded repodata support by @jjerphan in <https://github.com/mamba-org/mamba/pull/4187> |
| 30 | +- [micromamba, libmamba] fix: JSON should be set to `"success": false` when any transactions failed by @Klaim in <https://github.com/mamba-org/mamba/pull/4201> |
| 31 | +- [libmamba] fix: Skip non-executable matches in `which_in_one_impl` by @xsjk in <https://github.com/mamba-org/mamba/pull/4197> |
| 32 | +- [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in <https://github.com/mamba-org/mamba/pull/4210> |
| 33 | +- [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in <https://github.com/mamba-org/mamba/pull/4209> |
| 34 | +- [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in <https://github.com/mamba-org/mamba/pull/4205> |
| 35 | +- [libmamba] fix: Fallback on `uv` for listing installed packages if `pip` is not available by @jjerphan in <https://github.com/mamba-org/mamba/pull/4203> |
| 36 | +- [libmamba] fix: Respect thread affinity concurrency by @jjerphan in <https://github.com/mamba-org/mamba/pull/4193> |
| 37 | +- [libmamba] fix: Pass priorities in `load_single_subdir` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4188> |
| 38 | +- [micromamba] fix: Omit `--detach` option for run subcommand on Windows by @jjerphan in <https://github.com/mamba-org/mamba/pull/4185> |
| 39 | +- [micromamba, libmamba] fix: Sort `mamba search` results on version numerically by @jjerphan in <https://github.com/mamba-org/mamba/pull/4160> |
| 40 | +- [micromamba] fix: Pretty print short result for `mamba search` by default by @kuepe-sl in <https://github.com/mamba-org/mamba/pull/4066> |
| 41 | +- [micromamba, libmamba] fix: Show `pip` and `uv` output by default by @jjerphan in <https://github.com/mamba-org/mamba/pull/4155> |
| 42 | +- [micromamba, libmamba] Graceful handling of download cancel/interruption by @Klaim in <https://github.com/mamba-org/mamba/pull/4146> |
| 43 | +- [micromamba, libmamba] fix: Do not show activation message for dry runs by @jjerphan in <https://github.com/mamba-org/mamba/pull/4140> |
| 44 | +- [libmamba] fix: Only call `get_all_running_processes_info` when needed by @mihaitodor in <https://github.com/mamba-org/mamba/pull/4135> |
| 45 | +- [libmamba] Add #include <functional> for std::ref by @opoplawski in <https://github.com/mamba-org/mamba/pull/4132> |
| 46 | + |
| 47 | +CI fixes and doc: |
| 48 | + |
| 49 | +- [all] Fixed path in micromamba-installation.rst by @clausmichele in <https://github.com/mamba-org/mamba/pull/4194> |
| 50 | +- [all] ci: Disable `mamba-content-trust and auth tests` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4186> |
| 51 | +- [all] docs: Click to Copy code-blocks by @jjerphan in <https://github.com/mamba-org/mamba/pull/4175> |
| 52 | +- [all] ci: Exclude C++ tests in code coverage by @jjerphan in <https://github.com/mamba-org/mamba/pull/4147> |
| 53 | +- [all] ci: Use the `dev` branch from `micromamba-feedstock` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4144> |
| 54 | +- [all] ci: Free disk space for all linux workflows by @jjerphan in <https://github.com/mamba-org/mamba/pull/4138> |
| 55 | +- [all] ci: Free disk space for linux workflows by @jjerphan in <https://github.com/mamba-org/mamba/pull/4137> |
| 56 | + |
| 57 | +Maintenance: |
| 58 | + |
| 59 | +- [libmamba] maint: Retry for `update` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4220> |
| 60 | +- [libmamba] maint: Factorize common parts of the `install`, `update` and `remove` paths by @jjerphan in <https://github.com/mamba-org/mamba/pull/4215> |
| 61 | +- [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in <https://github.com/mamba-org/mamba/pull/4219> |
| 62 | +- [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in <https://github.com/mamba-org/mamba/pull/4218> |
| 63 | +- [micromamba] maint: Increase timeout of `test_env_logging_overhead_regression` to 1 minute by @jjerphan in <https://github.com/mamba-org/mamba/pull/4217> |
| 64 | +- [libmamba] maint: Replace `ShardPackageRecord` with `RepoDataPackage` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4212> |
| 65 | +- [libmamba] maint: Reduce logging in `Shards::parse_shard_msgpack` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4207> |
| 66 | +- [libmamba] maint: Split `load_channels_impl` into several functions by @jjerphan in <https://github.com/mamba-org/mamba/pull/4178> |
| 67 | +- [libmamba] maint: Adapt `Shards` ownership model by @jjerphan in <https://github.com/mamba-org/mamba/pull/4177> |
| 68 | +- [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in <https://github.com/mamba-org/mamba/pull/4180> |
| 69 | +- [micromamba] maint: Increase timeout of `test_env_logging_overhead_regression` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4173> |
| 70 | +- [libmamba] maint: Refactor Channel Loader by @jjerphan in <https://github.com/mamba-org/mamba/pull/4169> |
| 71 | +- [libmamba] maint: Introduce `DownloadRequestComponents` by @jjerphan in <https://github.com/mamba-org/mamba/pull/4164> |
| 72 | +- [libmamba] test: Changes for catch2 >3.8 by @jjerphan in <https://github.com/mamba-org/mamba/pull/4134> |
| 73 | + |
1 | 74 | ## 2026.01.08 |
2 | 75 |
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3 | 76 | Release: 2.5.0 (libmamba, mamba, micromamba, libmambapy) |
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