Download Latest Version 26.9.2 source code.zip (27.1 MB) Google Add to Preferred Sources
Home / 26.9.0
Name Modified Size InfoDownloads / Week
Parent folder
conda-26.9.0.tar.gz 2026-10-01 26.0 MB
0
conda-26.9.0.tar.gz.sha256sum 2026-10-01 65 Bytes
0
26.9.0 source code.tar.gz 2026-09-30 26.0 MB
0
26.9.0 source code.zip 2026-09-30 27.1 MB
0
README.md 2026-09-30 18.4 kB
0
Totals: 5 Items   79.0 MB 0

✨ Special announcements ✨

Upcoming change to automatic pip installation

Conda 26.9 marks the implicit installation of pip alongside Python as pending deprecation. It remains enabled by default in this release. The behavior becomes deprecated in conda 27.3, and add_pip_as_python_dependency will default to false in conda 27.9. The setting itself remains supported.

If your environments need pip, request it explicitly, for example with conda create -n myenv python pip. To retain automatic installation, run conda config --set add_pip_as_python_dependency true. To opt out early, run conda config --set add_pip_as_python_dependency false. See the rollout schedule and configuration documentation for details.

Native Windows ARM64 launchers

Conda 26.9 selects signed native ARM64 launchers for Python console entry points in win-arm64 target environments and verifies their SHA-256 hashes before installation. The release also fixes upgrades from defaults conda 26.7.2 that could leave those entry points missing. See #16293 and #16777.

Enhancements

  • Clarify the classic solver's repodata fallback message so it no longer describes the fallback as an unsuccessful attempt. (#12008 via [#16599])
  • Add --exclude-newer and exclude_newer configuration to exclude package records newer than a timestamp cutoff, with channel overrides and exclude_newer_package settings. Configured cutoffs also filter conda search results. The configured solver must support the requested cutoffs. Accurate timestamps can give security vendors time to flag newly built malicious packages before installation. Conda prefers channel-provided indexed_timestamp values and otherwise uses build timestamps. Records without usable timestamps remain eligible, so filtering does not guarantee a full delay after publication. (#15759)
  • Leave cached repodata unfiltered when applying exclude_newer, and validate solver selections before installation. (#15759)
  • Load subcommand parsers only when needed, reducing the number of modules imported at startup and improving conda startup time. (#15867 via [#15868])
  • Prefer extracted packages cached on the target environment's filesystem during transaction setup so they can be hard linked instead of copied. (#15969)
  • Use conda-launchers for Windows entry points, including native ARM64 launchers, and verify their SHA-256 hashes before installation. Use SHA-256 instead of MD5 for conda init launcher comparisons. Retain bundled launchers for upgrade compatibility and Windows 32-bit fallback. (#16293)
  • Add conda plugins list and conda plugins info to list installed plugins and inspect their metadata, including disabled plugins. (#16354, [#16356])
  • Show Constructor installer metadata in conda info. (#16432)
  • Show guidance for enabling sharded repodata when a channel provides only shards and sharded repodata is disabled. (#16453)
  • Show add_pip_as_python_dependency under Solver Configuration in conda config --describe. (#16545)
  • Add is_stdin_tty(), is_stderr_tty(), and is_interactive_tty() helpers to conda.common.terminal for checking stdin, stderr, and both stdin and stdout, respectively. Keep is_tty() as a stdout-only check. Use these helpers for stream checks and interactive prompts instead of handwritten isatty() checks. (#16594)
  • Avoid loading unrelated package records when copying indexes or preparing classic-solver solves, while preserving installed records and cached packages with their dependencies. (#16638)
  • Speed up wildcard searches of sharded channels by matching package names before constructing records, and show progress when searching for similar package names. (#16745 via [#16757])
  • Add a conda config --clear KEY option to explicitly set sequence configuration parameters to an empty list. (#7617 via [#16499])

Bug fixes

  • Do not force context.dev off when --dev is absent from activation or hook commands. Preserve dev mode configured through CONDA_DEV or dev: true, keeping CONDA_EXE intact when stacking or reactivating environments. (#14142 via [#16571], [#15696] via [#16571])
  • Require confirmation through --yes or always_yes to replace an existing environment with conda env create. (#15071)
  • Validate conda install --revision values during command parsing and report non-integer values as usage errors. (#16536)
  • Filter duplicate .tar.bz2 records from v3 sharded repodata when a .conda package with the same filename stem exists. (#16310)
  • Install pip dependencies from multiple environment files in one pip invocation so pip resolves them together. (#16359)
  • Cache the absence of classic repodata.json after an HTTP 404 when shards are present, avoiding repeated fallback requests. (#16452)
  • Limit cached channel notice responses to 24 hours so newly published notices can be fetched. (#16502)
  • Fix channel_settings lookups for channel names and URLs. (#16510)
  • Include support for individual sharded-repodata package shards up to 64 MiB after decompression, first released in conda 26.7.2. (#16575)
  • Fix false reports of altered files from conda doctor after binary prefix replacement on macOS ARM64 by recording sha256_in_prefix after code signing. (#16590)
  • Fix conda doctor --fix reinstalls for missing or altered files by building name=version=build specs from conda-meta records and passing force_reinstall through to the solver. (#16591 via [#16617])
  • Keep extracted cache packages referenced by soft-linked environments when running conda clean --packages or conda clean --all. (#16614)
  • Wrap channel notice text to fit the terminal. (#16598 via [#16629])
  • Invalidate context-derived caches when entering and exiting Context._override(), including memoizedproperty values such as custom_multichannels and custom_channels, and the Channel.from_value cache. Prevent stale values from masking temporary overrides or persisting after they end. (#16631 via [#16651])
  • Fix Channel.url(with_credentials=True) mangling authenticated sharded-repodata URLs by recognizing .msgpack.zst as a repodata extension. (#16637 via [#16634])
  • Send YAML environment-file warnings to stderr, including ignored sections and pip: dependencies without an explicit conda pip package. (#16543 via [#16641])
  • Make conda env config command help consistent and remove the invalid conda env config --append example. (#16642 via [#16643])
  • Fix the classic solver raising a TypeError instead of a package-not-found error for missing packages. (#16659)
  • Find v3 package records when searching channels without sharded repodata. (#16677 via [#16731])
  • Ensure v3 packages are available when mixing sharded and unsharded channels. (#16676 via [#16688])
  • Allow configuration map entries containing periods to be set, read, and removed without losing nested-key access. (#16691 via [#16693])
  • Fix get_session raising a TypeError when channel_settings identifies a channel with a file:// URL. (#16698 via [#16732])
  • Parse unquoted comma-separated MatchSpec extras as a list (e.g. pkg[extras=http2,cli]). (#16722 via [#16730])
  • Preserve exclude_newer capabilities when wrapping solver backends for sharded repodata. (#16752)
  • Fix IsADirectoryError when installing packages with absolute directory symlinks, and remove directory symlinks correctly during package removal and rollback. (#16759)
  • Report an actionable error without a traceback when activating with a positive CONDA_SHLVL and an unset or empty CONDA_PREFIX. (#15864, [#16764] via [#16064])
  • Fix native Windows ARM64 upgrades from defaults conda 26.7.2 that leave Python entry points missing by preserving the launcher needed by the running installer. (#16776 via [#16777])
  • Report Python entry-point creation failures through the existing transaction error handling and roll back failed transactions when rollback is enabled. (#16776 via [#16777])

Deprecations

  • Mark conda activate --dev, conda create --dev, conda install --dev, conda remove --dev, conda.base.context.Context.dev, and conda.utils.wrap_subprocess_call(dev_mode) as pending deprecation, to be removed in 27.9. Outside dev mode, activation unsets _CE_M and _CE_CONDA, while shell wrappers continue expanding them. Set PYTHONPATH to the conda source root instead. (#14142 via [#16571])
  • Mark the conda.cli.conda_argparse.configure_parser_* re-exported functions as pending deprecation, to be removed in 27.9. Import configure_parser directly from the relevant conda.cli.main_* module instead. (#15867 via [#15868])
  • Mark conda.cli.conda_argparse.user_rc_path, sys_rc_path, escaped_user_rc_path, and escaped_sys_rc_path as pending deprecation, to be removed in 27.9. Use conda.base.context.user_rc_path or sys_rc_path instead, applying .replace("%", "%%") locally for the escaped variants. (#15867 via [#15868])
  • Remove conda.gateways.disk.create.create_application_entry_point, conda.gateways.disk.create.ProgressFileWrapper, and conda.gateways.disk.create.create_fake_executable_softlink, deprecated in 26.3. (#16314)
  • Remove conda.cli.common.arg2spec. Use str(MatchSpec(arg)) with conda.models.match_spec.MatchSpec instead, keeping error handling and name-only validation for update commands in the caller. (#16314)
  • Remove the deprecated json keyword argument from conda.cli.common.specs_from_args and specs_from_url. Stop passing this argument. (#16314)
  • Remove conda.cli.main_compare.get_packages. Use conda.core.prefix_data.PrefixData(prefix, interoperability=True).map_records(), which returns a mapping of package names to records instead of a sorted list. (#16314)
  • Remove json.JSONEncoder monkey patching for frozendict and obj.to_json(). Use conda.common.serialize.json.dumps() or CondaJSONEncoder to encode these objects. (#16314)
  • Remove conda.auxlib.entity.EntityEncoder, conda.common.serialize.EntityEncoder, and conda.exports.EntityEncoder. Use conda.common.serialize.json.CondaJSONEncoder instead. Remove conda.common.serialize.json_load and json_dump. Use loads() and dumps(..., sort_keys=True) from conda.common.serialize.json, respectively. (#16314)
  • Remove conda.auxlib.logz.DumpEncoder, _DUMPS, and jsondumps. Use CondaJSONEncoder or dumps(..., ensure_ascii=False, sort_keys=True) from conda.common.serialize.json instead. (#16314)
  • Remove conda.plugins.hookspec.spec_name. Use conda.base.constants.APP_NAME. (#16314)
  • Remove type re-exports from conda.plugins. Import them from conda.plugins.types instead. (#16314)
  • Mark implicit installation of pip as a Python dependency as pending deprecation. Deprecate this behavior in conda 27.3 and change the default of add_pip_as_python_dependency to false in conda 27.9. To keep installing pip automatically with Python, run conda config --set add_pip_as_python_dependency true. To request pip explicitly, include it in the package specs, for example conda create -n myenv python pip. To opt out early, run conda config --set add_pip_as_python_dependency false. (#16404)
  • Mark conda.cli.install.get_revision as pending deprecation, to be removed in 27.9. Parse revision numbers with int() and handle invalid values in the caller. (#16536)
  • Mark passing caused_by as a positional argument to CondaError as pending deprecation, to be removed in 27.9. Use the caused_by keyword argument instead. (#16537)
  • Remove conda.env.env.Environment. Use conda.env.env.EnvironmentYaml instead. (#16314)
  • Remove conda.env.specs.yaml_file.YamlFileSpec.environment. Use YamlFileSpec.env, which returns conda.models.environment.Environment instead of EnvironmentYaml. (#16314)
  • Remove the CEP-24 compliance warning when loading non-compliant environment files. (#16314)
  • Remove automatic fallback to the environment.yml environment specifier when auto-detection fails. Pass --format=environment.yml to select this reader explicitly. (#16314)
  • Remove conda.auxlib.compat.isiterable. Use conda.common.compat.isiterable instead. (#16564)
  • Remove conda.core.index.calculate_channel_urls. Use conda.models.channel.all_channel_urls(context.channels) for configured channels, preserving any custom channels, platform, or use_local handling in the caller. (#16564)
  • Mark conda.base.context.Context.experimental as pending deprecation, becoming deprecated in 27.3 and removed in 27.9. (#16018 via [#16685])
  • Mark conda.common.configuration.Configuration.register_reset_callaback as pending deprecation, to be removed in 27.9. Use the correctly spelled register_reset_callback instead. (#16631)

Docs

  • Note that _CE_M and _CE_CONDA in activation examples are empty no-ops. Use PYTHONPATH and dev/start for local conda development. (#14142 via [#16571])
  • Correct the cheatsheet page's stale PDF note — the linked file is 64 KB and two pages, not 3 MB and single-page. (#15122)
  • Update the commands concept page with common conda commands, command-line help examples, and a note about plugin-provided commands. (#16023 via [#16485])
  • Update the channels concept page with examples of common public channels, guidance for finding channels on Anaconda.org, and a section explaining local channels. (#16026 via [#16484])
  • Add a user guide task page for using authenticated channels with the conda-auth plugin. (#16231 via [#16483])
  • Clarify how command-line package specifications are interpreted when installing packages with conda. (#10491 via [#16465])
  • Document conda environment activation in Bash and PowerShell scripts using conda shell.<shell> hook, and conda run as an alternative for executing a single command in an environment. (#7980 via [#16478])
  • Install PlantUML from conda-forge instead of downloading the jar from SourceForge during docs builds. (#16492)
  • Fix Miniconda download and information links. (#16529)
  • Document add_pip_as_python_dependency, including the planned default change in [#16404]. (#16545)
  • Add a developer guide to planning, announcing, and shipping breaking changes beyond public API removals, including configuration defaults, solver defaults, and CLI behavior. Link it from the Deprecations page and developer guide index. (#16570)
  • Document running and writing benchmarks, and link to Bencher results. (#16586 via [#16639])
  • Clarify wildcard matching in version specs: a trailing * matches version segments, so 1.4* matches 1.4.1 but not 1.40. An embedded * uses glob matching. (#16619 via [#16655])
  • Add a guide to installing supported pure Python wheels from PyPI with conda-pypi, including workflows, additional commands, security considerations, and limitations. (#16475 via [#16625], [#16756])
  • Update the new features page for stable conda-pypi support and multi-platform lockfiles, and add a card for --exclude-newer. (#16626)
  • Add a card to the new features page for native Windows ARM64 support, including choosing between win-64 and win-arm64 environments. (#16736)
  • Clarify the exclude_newer build-timestamp fallback and its publication-cooldown limitations. (#16739 via [#16741])

Other

  • Build Windows ARM64 canaries with native Python 3.14 and exercise their Windows entry points. (#15448 via [#16719])
  • Require packaging 26.3 or newer. (#16354)
  • Speed up test_dont_remove_conda with local conda and pycosat test packages. (#16426, [#16427] via [#16577])
  • Add Windows ARM64 GitHub-hosted runner coverage using win-64 emulation. (#16466)
  • Run the Windows test suite natively on ARM64 with Python 3.14 and conda-forge packages. (#16540)
  • Raise the ruamel.yaml upper version bound from <0.19 to <0.20. (#16576)
  • Fix always-true skip condition so test_dont_remove_conda_3 runs with solvers shipped with conda. (#16579)
  • Report benchmark results for the measured commit and compare matching testbeds. (#16586 via [#16639])
  • Speed up test_clone_env_with_conda by installing the local test-recipes conda package instead of a full conda-forge::conda stack before cloning. (#16604)
  • Speed up test_update_env_no_action_json_output by using tmp_env with ca-certificates instead of creating an environment with pip and PyPI click. (#16605)
  • Speed up test_json_create_install_update_remove by using test_recipes_channel with pycosat and versioned instead of remote zlib and ca-certificates. (#16606)
  • Speed up test_dont_remove_conda_3 by checking transaction verification directly instead of installing conda and converting the checkout. (#16669 via [#16751])
  • Speed up test_update_env_json_output by using test_recipes_channel with small-executable and dependency instead of remote ca-certificates and zlib. (#16670 via [#16744])
  • Speed up test_update by using test_recipes_channel with small-executable and dependency instead of remote ca-certificates and zlib. (#16671 via [#16743])
  • Record informational pull request benchmark comparisons and runner diagnostics on Ubuntu 24.04. (#16681)
  • Fix context cleanup in the shard connection test. (#16702)
  • Add conda-rattler-solver to the plugins bundled with conda and update plugin minimums to conda-libmamba-solver >=26.7.0, conda-lockfiles >=0.2.2, conda-pypi >=0.13.0, conda-rattler-solver >=0.2.0, and conda-self >=0.3.0. (#16491, [#16784])

Contributors

Source: README.md, updated 2026-09-30