We distribute a [PHP Archive (PHAR)](https://php.net/phar) that has all required (as well as some optional) dependencies of PHPUnit bundled in a single file:
```bash
$ wget https://phar.phpunit.de/phpunit-X.Y.phar
$ php phpunit-X.Y.phar --version
```
Please replace `X.Y` with the version of PHPUnit you are interested in.
Alternatively, you may use [Composer](https://getcomposer.org/) to download and install PHPUnit as well as its dependencies. Please refer to the [documentation](https://phpunit.de/documentation.html) for details on how to install PHPUnit.
Please refer to [CONTRIBUTING.md](https://github.com/sebastianbergmann/phpunit/blob/main/.github/CONTRIBUTING.md) for information on how to contribute to PHPUnit and its related projects.
Thanks to everyone who has contributed to PHPUnit! You can find a detailed list of contributors on every PHPUnit related package on GitHub. This list shows only the major components:
A very special thanks to everyone who has contributed to the [documentation](https://github.com/sebastianbergmann/phpunit-documentation-english/graphs/contributors).