Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires dms/phpunit-arraysubset-asserts dev-master -> satisfiable by dms/phpunit-arraysubset-asserts[dev-master]. - dms/phpunit-arraysubset-asserts dev-master requires phpunit/phpunit ^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.0 || ^10.0 -> found phpunit/phpunit[4.8.36, 5.7.21, ..., 5.7.27, 6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.x-dev, 9.0.0, ..., 9.6.x-dev, 10.0.0, ..., 10.5.x-dev] but it conflicts with your root composer.json require (^11.2). Problem 2 - phpunit/phpunit[dev-main, 11.2.x-dev] require phpunit/php-code-coverage ^11.0.5 -> found phpunit/php-code-coverage[dev-main, 11.0.5, 11.0.x-dev (alias of dev-main)] but it conflicts with your root composer.json require (^10.0). - phpunit/phpunit[11.2.0, ..., 11.2.6] require phpunit/php-code-coverage ^11.0 -> found phpunit/php-code-coverage[dev-main, 11.0.0, ..., 11.0.x-dev (alias of dev-main)] but it conflicts with your root composer.json require (^10.0). - phpunit/phpunit 11.3.x-dev is an alias of phpunit/phpunit dev-main and thus requires it to be installed too. - Root composer.json requires phpunit/phpunit ^11.2 -> satisfiable by phpunit/phpunit[11.2.0, ..., 11.3.x-dev (alias of dev-main)].