Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^12.5.22 -> satisfiable by phpunit/phpunit[12.5.22, 12.5.23]. - phpunit/phpunit[12.5.22, ..., 12.5.23] require php >=8.3 -> your php version (8.2.29) 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.