Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^13.0.0 -> satisfiable by phpunit/phpunit[13.0.0]. - phpunit/phpunit 13.0.0 requires php >=8.4.1 -> your php version (8.3.30) does not satisfy that requirement. Problem 2 - Root composer.json requires php-mock/php-mock-phpunit ^2.8.0 -> satisfiable by php-mock/php-mock-phpunit[2.8.0, ..., 2.15.0]. - php-mock/php-mock-phpunit 2.10.0 requires phpunit/phpunit ^6 || ^7 || ^8 || ^9 || ^10.0.17 || ^11 -> found phpunit/phpunit[6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.52, 9.0.0, ..., 9.6.34, 10.0.17, ..., 10.5.63, 11.0.0, ..., 11.5.51] but it conflicts with your root composer.json require (^13.0.0). - php-mock/php-mock-phpunit[2.11.0, ..., 2.12.0] require phpunit/phpunit ^6 || ^7 || ^8 || ^9 || ^10.0.17 || ^11 || ^12 -> found phpunit/phpunit[6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.52, 9.0.0, ..., 9.6.34, 10.0.17, ..., 10.5.63, 11.0.0, ..., 11.5.51, 12.0.0, ..., 12.5.9] but it conflicts with your root composer.json require (^13.0.0). - php-mock/php-mock-phpunit[2.13.0, ..., 2.14.0] require phpunit/phpunit ^6 || ^7 || ^8 || ^9 || ^10.0.17 || ^11 || ^12.0.9 -> found phpunit/phpunit[6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.52, 9.0.0, ..., 9.6.34, 10.0.17, ..., 10.5.63, 11.0.0, ..., 11.5.51, 12.0.9, ..., 12.5.9] but it conflicts with your root composer.json require (^13.0.0). - php-mock/php-mock-phpunit 2.15.0 requires phpunit/phpunit ^6 || ^7 || ^8 || ^9 || ^10.0.17 || ^11 || ^12.0.9 || ^13 -> satisfiable by phpunit/phpunit[13.0.0]. - php-mock/php-mock-phpunit[2.8.0, ..., 2.9.0] require phpunit/phpunit ^6 || ^7 || ^8 || ^9 || ^10.0.17 -> found phpunit/phpunit[6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.52, 9.0.0, ..., 9.6.34, 10.0.17, ..., 10.5.63] but it conflicts with your root composer.json require (^13.0.0). - phpunit/phpunit 13.0.0 requires php >=8.4.1 -> your php version (8.3.30) does not satisfy that requirement. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.