Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.2 -> satisfiable by phpunit/phpunit[11.2.0, ..., 11.2.6]. - vimeo/psalm[5.24.0, ..., 5.25.0] require nikic/php-parser ^4.16 -> satisfiable by nikic/php-parser[v4.16.0, ..., v4.19.1]. - vimeo/psalm 4.30.0 requires nikic/php-parser ^4.13 -> satisfiable by nikic/php-parser[v4.13.0, ..., v4.19.1]. - You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.13.2, ..., v4.19.1, v5.0.0, v5.0.1, v5.0.2, v5.1.0]. - phpunit/php-code-coverage[11.0.0, ..., 11.0.5] require nikic/php-parser ^5.0 -> satisfiable by nikic/php-parser[v5.0.0, v5.0.1, v5.0.2, v5.1.0]. - Conclusion: install phpunit/php-code-coverage 11.0.5 (conflict analysis result) - Root composer.json requires vimeo/psalm ^4.30|^5.24 -> satisfiable by vimeo/psalm[4.30.0, 5.24.0, 5.25.0].