Support for PHPUnit 4 ended on Feb 3, 2017. The transition from PHPUnit
4 to PHPUnit 5 is simple, and we should update the library. There's
little risk of breaking things since this is only a dev dependency.
In fact, support for PHPUnit 5 ended on Feb 2, 2018, but we can't
upgrade to PHPUnit 6 while still supporting PHP 5.6 (which will no
longer be supported after Jan 1, 2019).
Support for PHPUnit 4 ended on Feb 3, 2017. The transition from PHPUnit 4 to PHPUnit 5 is simple, and we should update the library. There's little risk of breaking things since this is only a dev dependency.
In fact, support for PHPUnit 5 ended on Feb 2, 2018, but we can't upgrade to PHPUnit 6 while still supporting PHP 5.6 (which will no longer be supported after Jan 1, 2019).
https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-5.0.0 https://phpunit.de/getting-started/phpunit-5.html https://phpunit.de/getting-started/phpunit-4.html https://secure.php.net/supported-versions.php