Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^12.2.7 -> satisfiable by phpunit/phpunit[12.2.7]. - phpunit/phpunit 12.2.7 requires php >=8.3 -> your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires yoast/phpunit-polyfills ^4.0 -> satisfiable by yoast/phpunit-polyfills[4.0.0]. - phpunit/phpunit 12.2.7 requires php >=8.3 -> your php version (7.4.33) does not satisfy that requirement. - yoast/phpunit-polyfills 4.0.0 requires phpunit/phpunit ^7.5 || ^8.0 || ^9.0 || ^11.0 || ^12.0 -> satisfiable by phpunit/phpunit[12.2.7].