2.6.2

Bug fixes:

• [libmamba] fix: Use zlib<1.3.2 for static builds by @jjerphan in #4281
• [libmamba] fix: Set environment variables for use_sharded_repodata by @jjerphan in #4279

CI fixes and doc:

• [all] ci: Use micromamba 2.6.0 by @jjerphan in #4280

2.6.1

Bug fixes:

• [libmamba] fix: Support local install without explicit path by @jjerphan in #4273
• [micromamba, libmamba] fix: Free-threaded builds location on Windows by @jjerphan in #4268
• [libmamba] fix: Do not use python for platform detection by @jjerphan in #4257
• [libmamba] fix: Adapt Sharded Repodata TTL update logic by @jjerphan in #4269
• [libmamba] fix: Adaptations for vcpkg's distribution of zlib 1.3.2 on Windows by @jjerphan in #4260
• [libmamba] fix: Normalize MatchSpec package names to lowercase by @jjerphan in #4258
• [libmambapy] fix: Adapt add_pip_as_python_dependency python tests by @danyeaw in #4252
• [micromamba, libmamba] fix: Entirely clean cache on clean --all by @jjerphan in #4249
• [libmamba] fix: Normalize MatchSpec's name to lowercase internally by @jjerphan in #4248

CI fixes and doc:

• [all] ci: Remove sedatives by @jjerphan in #4271

Maintenance:

• [libmamba] maint: Remove libxml2 as a dependency by @jjerphan in #4261

2.6.0

Highlights: Sharded Repodata Support

This minor version includes the support for sharded repodata, significantly improving the UX of the project.

Geometric means of improvement factors between 2.5.0 and 2.6.0 across various specifications:

Analysis	Cold cache (first installation)	Warm cache (subsequent installations)
Wall time speedup	4.1979×	9.7189×
Peak RSS reduction	17.2994×	16.1247×
Network I/O reduction	21.1021×	N/A

💡As of 2.6.0, sharded repodata are used by default if they are present on conda channel.
One can opt-out of this behavior by setting use_sharded_repodata to false in mamba’s configuration.

🔗 Read more about improvements on this blog post.

You can update micromamba to 2.6.0 using:

micromamba self-update

---

Enhancements:

• [libmamba] feat: Improve progress messages for flat repodata by @jjerphan in #4237
• [libmamba] feat: Improve Sharded Repodata Progress Message by @jjerphan in #4225
• [libmamba, micromamba] feat: Sharded Repodata Support for repoquery by @jjerphan in #4226
• [libmamba, micromamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [libmamba, micromamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [libmamba, micromamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmambapy, libmamba] feat: Shard types and utils by @jjerphan in #4145
• [libmamba, micromamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [libmamba] fix: Transitive dependencies across channels shards by @jjerphan in #4245
• [libmamba] fix: Make shards availability independent from local cache by @jjerphan in #4243
• [libmamba] fix: Support update --all with Sharded Repodata by @jjerphan in #4241
• [all] fix: Correct repodata_record.json metadata for installations using explicit specifications by @maresb in #4110
• [libmamba, micromamba] fix: Adapt python_site_packages_path on Windows by @jjerphan in #4232
• [libmamba] fix: Keep and use RepoDataPackage's raw version by @jjerphan in #4238
• [libmamba] fix: Make mamba clean --all clear the shards' cache by @jjerphan in #4236
• [libmamba] fix: python_binary_compatible by @chrisburr in #4234
• [libmamba] fix: Add python_abi as a root package with python by @jjerphan in #4233
• [libmamba] fix: Support mixture of flat and sharded repodata by @jjerphan in #4227
• [libmambapy, libmamba] fix: Adapt bindings for UnresolvedChannel's readonly properties by @jjerphan in #4224
• [libmamba, micromamba] config sub-command output hides secrets by @Klaim in #4223
• [libmamba, micromamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [libmamba, micromamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [libmamba, micromamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [libmamba, micromamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [libmamba, micromamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [libmamba, micromamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137

Maintenance:

• [libmamba] maint: Rename repodata_use_shards to use_sharded_repodata by @jjerphan in #4244
• [all] build(deps): bump actions/github-script from 8 to 9 by @app/dependabot in #4229
• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in <https://github.com/mamb...

2.6.0.rc5

Enhancements:

• [libmamba] feat: Improve progress messages for flat repodata by @jjerphan in #4237
• [libmamba] feat: Improve Sharded Repodata Progress Message by @jjerphan in #4225
• [libmamba, micromamba] feat: Sharded Repodata Support for repoquery by @jjerphan in #4226
• [libmamba, micromamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [libmamba, micromamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [libmamba, micromamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmambapy, libmamba] feat: Shard types and utils by @jjerphan in #4145
• [libmamba, micromamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [libmamba] fix: Transitive dependencies across channels shards by @jjerphan in #4245
• [libmamba] fix: Make shards availability independent from local cache by @jjerphan in #4243
• [libmamba] fix: Support update --all with Sharded Repodata by @jjerphan in #4241
• [all] fix: Correct repodata_record.json metadata for installations using explicit specifications by @maresb in #4110
• [libmamba, micromamba] fix: Adapt python_site_packages_path on Windows by @jjerphan in #4232
• [libmamba] fix: Keep and use RepoDataPackage's raw version by @jjerphan in #4238
• [libmamba] fix: Make mamba clean --all clear the shards' cache by @jjerphan in #4236
• [libmamba] fix: python_binary_compatible by @chrisburr in #4234
• [libmamba] fix: Add python_abi as a root package with python by @jjerphan in #4233
• [libmamba] fix: Support mixture of flat and sharded repodata by @jjerphan in #4227
• [libmambapy, libmamba] fix: Adapt bindings for UnresolvedChannel's readonly properties by @jjerphan in #4224
• [libmamba, micromamba] config sub-command output hides secrets by @Klaim in #4223
• [libmamba, micromamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [libmamba, micromamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [libmamba, micromamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [libmamba, micromamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [libmamba, micromamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [libmamba, micromamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include <functional> for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137
• [all] ci: Use windows-latest by @jjerphan in #4131

Maintenance:

• [libmamba] maint: Rename repodata_use_shards to use_sharded_repodata by @jjerphan in #4244
• [all] build(deps): bump actions/github-script from 8 to 9 by @app/dependabot in #4229
• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in #4173
• [libmamba] maint: Refactor Channel Loader by @jjerphan in #4169
• [libmamba] maint: Introduce DownloadRequestComponents by @jjerphan in #4164
• [libmamba] test: Changes for catch2 >3.8 by @jjerphan in #4134

2.6.0.rc4

Enhancements:

• [libmamba] feat: Improve progress messages for flat repodata by @jjerphan in #4237
• [libmamba] feat: Improve Sharded Repodata Progress Message by @jjerphan in #4225
• [micromamba, libmamba] feat: Sharded Repodata Support for repoquery by @jjerphan in #4226
• [micromamba, libmamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [micromamba, libmamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [micromamba, libmamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmamba, libmambapy] feat: Shard types and utils by @jjerphan in #4145
• [micromamba, libmamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [libmamba] fix: Make shards availability independent from local cache by @jjerphan in #4243
• [libmamba] fix: Support update --all with Sharded Repodata by @jjerphan in #4241
• [all] fix: Correct repodata_record.json metadata for installations using explicit specifications by @maresb in #4110
• [micromamba, libmamba] fix: Adapt python_site_packages_path on Windows by @jjerphan in #4232
• [libmamba] fix: Keep and use RepoDataPackage's raw version by @jjerphan in #4238
• [libmamba] fix: Make mamba clean --all clear the shards' cache by @jjerphan in #4236
• [libmamba] fix: python_binary_compatible by @chrisburr in #4234
• [libmamba] fix: Add python_abi as a root package with python by @jjerphan in #4233
• [libmamba] fix: Support mixture of flat and sharded repodata by @jjerphan in #4227
• [libmamba, libmambapy] fix: Adapt bindings for UnresolvedChannel's readonly properties by @jjerphan in #4224
• [micromamba, libmamba] config sub-command output hides secrets by @Klaim in #4223
• [micromamba, libmamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [micromamba, libmamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [micromamba, libmamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [micromamba, libmamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [micromamba, libmamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [micromamba, libmamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include <functional> for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137

Maintenance:

• [libmamba] maint: Rename repodata_use_shards to use_sharded_repodata by @jjerphan in #4244
• [all] build(deps): bump actions/github-script from 8 to 9 by @app/dependabot in #4229
• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in #4173
• [libmamba] maint: Refactor Channel Loader by @jjerphan in #4169
• [libmamba] maint: Introduce DownloadRequestComponents by @jjerphan in #4164
• [libmamba] test: Changes for catch2 >3.8 by @jjerphan in #4134

2.6.0.rc3

Enhancements:

• [libmamba] feat: Improve progress messages for flat repodata by @jjerphan in #4237
• [libmamba] feat: Improve Sharded Repodata Progress Message by @jjerphan in #4225
• [micromamba, libmamba] feat: Sharded Repodata Support for repoquery by @jjerphan in #4226
• [micromamba, libmamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [micromamba, libmamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [micromamba, libmamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmambapy, libmamba] feat: Shard types and utils by @jjerphan in #4145
• [micromamba, libmamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [micromamba, libmamba] fix: Adapt python_site_packages_path on Windows by @jjerphan in #4232
• [libmamba] fix: Keep and use RepoDataPackage's raw version by @jjerphan in #4238
• [libmamba] fix: Make mamba clean --all clear the shards' cache by @jjerphan in #4236
• [libmamba] fix: python_binary_compatible by @chrisburr in #4234
• [libmamba] fix: Add python_abi as a root package with python by @jjerphan in #4233
• [libmamba] fix: Support mixture of flat and sharded repodata by @jjerphan in #4227
• [libmambapy, libmamba] fix: Adapt bindings for UnresolvedChannel's readonly properties by @jjerphan in #4224
• [micromamba, libmamba] config sub-command output hides secrets by @Klaim in #4223
• [micromamba, libmamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [micromamba, libmamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [micromamba, libmamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [micromamba, libmamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [micromamba, libmamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [micromamba, libmamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include <functional> for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137
• [all] ci: Use windows-latest by @jjerphan in #4131

Maintenance:

• [all] build(deps): bump actions/github-script from 8 to 9 by @app/dependabot in #4229
• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in #4173
• [libmamba] maint: Refactor Channel Loader by @jjerphan in #4169
• [libmamba] maint: Introduce DownloadRequestComponents by @jjerphan in #4164
• [libmamba] test: Changes for catch2 >3.8 by @jjerphan in #4134

2.6.0.rc2

Enhancements:

• [libmamba] feat: Improve progress messages for flat repodata by @jjerphan in #4237
• [libmamba] feat: Improve Sharded Repodata Progress Message by @jjerphan in #4225
• [libmamba, micromamba] feat: Sharded Repodata Support for repoquery by @jjerphan in #4226
• [libmamba, micromamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [libmamba, micromamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [libmamba, micromamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmamba, libmambapy] feat: Shard types and utils by @jjerphan in #4145
• [libmamba, micromamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [libmamba] fix: Make mamba clean --all clear the shards' cache by @jjerphan in #4236
• [libmamba] fix: python_binary_compatible by @chrisburr in #4234
• [libmamba] fix: Add python_abi as a root package with python by @jjerphan in #4233
• [libmamba] fix: Support mixture of flat and sharded repodata by @jjerphan in #4227
• [libmamba, libmambapy] fix: Adapt bindings for UnresolvedChannel's readonly properties by @jjerphan in #4224
• [libmamba, micromamba] config sub-command output hides secrets by @Klaim in #4223
• [libmamba, micromamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [libmamba, micromamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [libmamba, micromamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [libmamba, micromamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [libmamba, micromamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [libmamba, micromamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include <functional> for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137

Maintenance:

• [all] build(deps): bump actions/github-script from 8 to 9 by @app/dependabot in #4229
• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in #4173
• [libmamba] maint: Refactor Channel Loader by @jjerphan in #4169
• [libmamba] maint: Introduce DownloadRequestComponents by @jjerphan in #4164
• [libmamba] test: Changes for catch2 >3.8 by @jjerphan in #4134

2.6.0.rc1

2026.04.14

Release: 2.6.0.rc1 (libmamba, mamba, micromamba, libmambapy)

Enhancements:

• [libmamba] feat: Improve Sharded Repodata Progress Message by @jjerphan in #4225
• [micromamba, libmamba] feat: Sharded Repodata Support for repoquery by @jjerphan in #4226
• [micromamba, libmamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [micromamba, libmamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [micromamba, libmamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmambapy, libmamba] feat: Shard types and utils by @jjerphan in #4145
• [micromamba, libmamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [libmamba] fix: Support mixture of flat and sharded repodata by @jjerphan in #4227
• [libmambapy, libmamba] fix: Adapt bindings for UnresolvedChannel's readonly properties by @jjerphan in #4224
• [micromamba, libmamba] config sub-command output hides secrets by @Klaim in #4223
• [micromamba, libmamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [micromamba, libmamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [micromamba, libmamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [micromamba, libmamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [micromamba, libmamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [micromamba, libmamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include <functional> for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137
• [all] ci: Use windows-latest by @jjerphan in #4131

Maintenance:

• [all] build(deps): bump actions/github-script from 8 to 9 by @app/dependabot in #4229
• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in #4173
• [libmamba] maint: Refactor Channel Loader by @jjerphan in #4169
• [libmamba] maint: Introduce DownloadRequestComponents by @jjerphan in #4164
• [libmamba] test: Changes for catch2 >3.8 by @jjerphan in #4134

2.6.0.rc0

Enhancements:

• [micromamba, libmamba] feat: Prefilter Shard Records on Python Minor Version by @jjerphan in #4214
• [libmamba] feat: Introduce MatchSpec::extract_name by @jjerphan in #4206
• [libmamba] feat: Optimize PackageInfo descending sorts by @jjerphan in #4208
• [libmamba] feat: Shard Index Handling Adaptation by @jjerphan in #4190
• [libmamba] feat: Parse optional fields for ShardPackageRecord by @jjerphan in #4195
• [libmamba] feat: Support track_features for ShardRecord by @jjerphan in #4192
• [libmamba] feat: Shard Caching by @jjerphan in #4174
• [micromamba, libmamba] feat: Do not warn for missing channels index by @jjerphan in #4189
• [all] build: Export libmamba-spdlog target for building dependencies in tree by @opoplawski in #4172
• [libmamba] feat: Sharded Repodata by @jjerphan in #4162
• [libmamba] feat: Support MSGPACK_OBJECT_ARRAY for hashes by @jjerphan in #4167
• [micromamba, libmamba] feat: Redesign packages caches hierarchically on channels and platforms by @jjerphan in #4163
• [libmamba] feat: Consider emscripten a UNIX platform by @jjerphan in #4168
• [libmamba] feat: Shard Traversal by @jjerphan in #4161
• [libmamba] feat: ShardIndexLoader by @jjerphan in #4149
• [libmamba] feat: Shards by @jjerphan in #4148
• [libmamba, libmambapy] feat: Shard types and utils by @jjerphan in #4145
• [micromamba, libmamba] feat: Support Prefix Data Interoperability by @jjerphan in #4123

Bug fixes:

• [micromamba, libmamba] config sub-command output hides secrets by @Klaim in #4223
• [micromamba, libmamba] fix: Minor adaptations for sharded repodata support by @jjerphan in #4187
• [micromamba, libmamba] fix: JSON should be set to "success": false when any transactions failed by @Klaim in #4201
• [libmamba] fix: Skip non-executable matches in which_in_one_impl by @xsjk in #4197
• [libmamba] fix: Adapt Shards base URL to handle channel identifiers by @jjerphan in #4210
• [libmamba] fix: Treat sibling-subdir shard loads as successful by @jjerphan in #4209
• [libmamba] fix: Exclude Installed Packages from Root Packages by @jjerphan in #4205
• [libmamba] fix: Fallback on uv for listing installed packages if pip is not available by @jjerphan in #4203
• [libmamba] fix: Respect thread affinity concurrency by @jjerphan in #4193
• [libmamba] fix: Pass priorities in load_single_subdir by @jjerphan in #4188
• [micromamba] fix: Omit --detach option for run subcommand on Windows by @jjerphan in #4185
• [micromamba, libmamba] fix: Sort mamba search results on version numerically by @jjerphan in #4160
• [micromamba] fix: Pretty print short result for mamba search by default by @kuepe-sl in #4066
• [micromamba, libmamba] fix: Show pip and uv output by default by @jjerphan in #4155
• [micromamba, libmamba] Graceful handling of download cancel/interruption by @Klaim in #4146
• [micromamba, libmamba] fix: Do not show activation message for dry runs by @jjerphan in #4140
• [libmamba] fix: Only call get_all_running_processes_info when needed by @mihaitodor in #4135
• [libmamba] Add #include for std::ref by @opoplawski in #4132

CI fixes and doc:

• [all] Fixed path in micromamba-installation.rst by @clausmichele in #4194
• [all] ci: Disable mamba-content-trust and auth tests by @jjerphan in #4186
• [all] docs: Click to Copy code-blocks by @jjerphan in #4175
• [all] ci: Exclude C++ tests in code coverage by @jjerphan in #4147
• [all] ci: Use the dev branch from micromamba-feedstock by @jjerphan in #4144
• [all] ci: Free disk space for all linux workflows by @jjerphan in #4138
• [all] ci: Free disk space for linux workflows by @jjerphan in #4137

Maintenance:

• [libmamba] maint: Retry for update by @jjerphan in #4220
• [libmamba] maint: Factorize common parts of the install, update and remove paths by @jjerphan in #4215
• [all] build(deps): bump mamba-org/setup-micromamba from 2 to 3 by @app/dependabot in #4219
• [all] build(deps): bump codecov/codecov-action from 5 to 6 by @app/dependabot in #4218
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression to 1 minute by @jjerphan in #4217
• [libmamba] maint: Replace ShardPackageRecord with RepoDataPackage by @jjerphan in #4212
• [libmamba] maint: Reduce logging in Shards::parse_shard_msgpack by @jjerphan in #4207
• [libmamba] maint: Split load_channels_impl into several functions by @jjerphan in #4178
• [libmamba] maint: Adapt Shards ownership model by @jjerphan in #4177
• [all] build(deps): bump actions/upload-artifact from 6 to 7 by @app/dependabot in #4180
• [micromamba] maint: Increase timeout of test_env_logging_overhead_regression by @jjerphan in #4173
• [libmamba] maint: Refactor Channel Loader by @jjerphan in #4169
• [libmamba] maint: Introduce DownloadRequestComponents by @jjerphan in #4164
• [libmamba] test: Changes for catch2 >3.8 by @jjerphan in #4134

2.5.0

Enhancements:

• [all] Remove spdlog from libmamba, provide libmamba-spdlog library by @Klaim in #4082
• [libmamba, micromamba] feat: Support environment variables modifications by @jjerphan in #4106
• [libmamba, micromamba] feat: Support cloning environment by @jjerphan in #4102

Bug fixes:

• [micromamba] CMake adaptations for distributing libmamba-spdlog by @JohanMabille in #4129
• [libmamba, micromamba] fix: Pin python_abi when python-freethreading is installed by @jjerphan in #4113
• [libmamba, micromamba] fix: Resolve ca-certificates installed in the local environment by @jjerphan in #4101
• [libmamba, micromamba] fix: List all environments' names by @jjerphan in #4109
• [libmamba, micromamba] fix: list dependencies pulled with uv by @iisakkirotko in #4026

CI fixes and doc:

• [all] Fix formatting of unordered lists in the docs by @pozdneev in #4128
• [all] docs: Uninstallation instructions by @jjerphan in #4108
• [all] Update README to remove QuantStack Zulip link by @jezdez in #4105
• [all] Change chat links to QuantStack and Conda Zulip by @jezdez in #4103

Maintenance:

• [libmamba] fixed test "load_file_specs" too strict by @Klaim in #4124
• [all] build(deps): bump actions/cache from 4 to 5 by @app/dependabot in #4122
• [all] build(deps): bump actions/upload-artifact from 5 to 6 by @app/dependabot in #4121
• [all] build(deps): bump actions/cache from 4 to 5 in /.github/actions/workspace by @app/dependabot in #4120