# Changes to PostCSS Preset Env

### 10.4.0

_September 21, 2025_

_August 22, 2025_

- Added `@csstools/postcss-contrast-color-function` [Check the plugin README](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-contrast-color-function#readme) for usage details.
- Updated [`@csstools/postcss-progressive-custom-properties`](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-progressive-custom-properties) to [`4.2.1`](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-progressive-custom-properties/CHANGELOG.md#421) (patch)

[Full CHANGELOG](https://github.com/csstools/postcss-plugins/tree/main/plugin-packs/postcss-preset-env/CHANGELOG.md)