Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.2.8 -> satisfiable by phpunit/phpunit[11.2.8]. - phpunit/phpunit 11.2.8 requires php >=8.2 -> your php version (8.1.27) 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.