Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.0.0 -> satisfiable by phpunit/phpunit[11.0.0, 11.0.1, 11.0.2]. - You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.16.0, v4.17.0, v4.17.1, v4.18.0, v5.0.0]. - phpunit/php-code-coverage 11.0.0 requires nikic/php-parser ^5.0 -> satisfiable by nikic/php-parser[v5.0.0]. - vimeo/psalm 5.21.1 requires nikic/php-parser ^4.16 -> satisfiable by nikic/php-parser[v4.16.0, v4.17.0, v4.17.1, v4.18.0]. - vimeo/psalm 5.21.1 conflicts with nikic/php-parser v4.17.0. - phpunit/phpunit[11.0.0, ..., 11.0.2] require phpunit/php-code-coverage ^11.0 -> satisfiable by phpunit/php-code-coverage[11.0.0]. - Root composer.json requires vimeo/psalm ^5.21.1 -> satisfiable by vimeo/psalm[5.21.1]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.