# Changes to CSS Parser Algorithms

### 4.0.1

_September 25, 2026_

- Improve performance
- Throw when the nesting depth of functions and simple blocks exceeds the maximum
- Updated [`@csstools/css-tokenizer`](https://github.com/csstools/postcss-plugins/tree/main/packages/css-tokenizer) to [`4.0.1`](https://github.com/csstools/postcss-plugins/tree/main/packages/css-tokenizer/CHANGELOG.md#401) (patch)
- Updated [`@csstools/css-tokenizer`](https://github.com/csstools/postcss-plugins/tree/main/packages/css-tokenizer) to [`4.0.2`](https://github.com/csstools/postcss-plugins/tree/main/packages/css-tokenizer/CHANGELOG.md#402) (patch)

[Full CHANGELOG](https://github.com/csstools/postcss-plugins/tree/main/packages/css-parser-algorithms/CHANGELOG.md)