Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^12.0.1 -> satisfiable by phpunit/phpunit[12.0.1]. - phpunit/php-code-coverage 12.0.0 requires nikic/php-parser ^5.4.0 -> found nikic/php-parser[v5.4.0] but it conflicts with your root composer.json require (^4.16.0). - phpunit/phpunit 12.0.1 requires phpunit/php-code-coverage ^12.0.0 -> satisfiable by phpunit/php-code-coverage[12.0.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.