25.11.0

Enhancements

• Allow the PyYAML loader to be specified when calling conda_build.variants.parse_config_file. (#5800)
• Raise menuinst JSON validation errors, which used to be warnings. (#5807)

Bug fixes

• Fix BUILD environment variable to respect cdt_name variant configuration. Previously, BUILD was hardcoded to use cos6 or cos7 based on architecture, ignoring the cdt_name variant when specified. Now, if cdt_name is provided in the variant configuration, it will be used in the BUILD variable. Otherwise, it falls back to the architecture-based default. (#5733)
• Fix Windows MSVC version detection for Python 3.5+. (#5807, #5818)
• Update CMake generator handling for CMake 4 compatibility. CMake 2 compatibility was dropped in CMake 4. (#5807)
• Fix set_regex when finding used variables inside jinja statements. (#5812 via #5811)

Deprecations

• Remove Python 3.9 support. The minimum supported Python version is now 3.10. (#5807)

Other

• Add Python 3.13 to Linux test matrix. (#5807)
• Fix conda deprecation warning filters to prevent CI test failures with strict validation. (#5807)

Contributors

• @conda-bot
• @isuruf
• @jaimergp
• @kenodegard
• @ryanskeith
• @shermansiu made their first contribution in #5800
• @dependabot[bot]
• @pre-commit-ci[bot]

Full Changelog: 25.9.0...25.11.0