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September 2025 Releases

· 2 min read
Ken Odegard
Ken Odegard
Conda Maintainer

The September 2025 releases included updates to conda and conda-build! 🎉 Both have been released to defaults and conda-forge channels.

Changes in conda 25.9.0​

Special Announcement

Following feedback from conda users last year about the pre-configuration of the conda code base to favor channels from Anaconda Inc., we finished removing the hardcoding of Anaconda's channels as the default set of channels in the conda source code.

It is now up to providers of the conda distributions, such as miniforge or Anaconda (including miniconda), to pre-configure their preferred channels, e.g. by running the necessary conda config --set channels command.

To update conda to the latest version, run:

conda install --name base conda=25.9.0

Notable Changes:

  • Added two new health checks to conda doctor:
    • Check for ill-formed pinned file.
    • Check whether file locking is supported.
  • Prevented renaming an environment currently listed as the default_activation_env.
  • Added a new environment specifier, cep-24. This is a stricter version of the environment.yml format that enforces specific requirements and can be used when creating an environment from a file, e.g., conda env create --file FILE --environment-specifier cep-24.
  • Updated environment model to support multiple platforms. This allows conda export --format FORMAT to support exporting multiple platforms at once.
  • Annotated frozen environments in conda env list.
  • Various deprecations were made.

Check out the full changelog for more: 25.9.0

Changes in conda-build 25.9.0​

To update conda-build to the latest version, run:

conda install --name base conda-build=25.9.0

Notable Changes:

No major changes to report. We just removed some deprecated code according to our deprecation schedule and made corrections to documentation.

Check out the full changelog for more: 25.9.0

We ❤️ Our Community​

Altogether, we had 7 new contributors this release cycle; thank you to all of our open source community members for helping make these improvements possible.