Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires roave/infection-static-analysis-plugin ^1.35.0 -> satisfiable by roave/infection-static-analysis-plugin[1.35.0]. - Root composer.json requires phpunit/phpunit ^11.3.1 -> satisfiable by phpunit/phpunit[11.3.1]. - Root composer.json requires vimeo/psalm ^5.25.0 -> satisfiable by vimeo/psalm[5.25.0]. - phpunit/phpunit 11.3.1 requires phpunit/php-code-coverage ^11.0.5 -> satisfiable by phpunit/php-code-coverage[11.0.5, 11.0.6]. - phpunit/php-code-coverage 11.0.6 requires nikic/php-parser ^5.1.0 -> satisfiable by nikic/php-parser[v5.1.0]. - phpunit/php-code-coverage 11.0.5 requires nikic/php-parser ^5.0 -> satisfiable by nikic/php-parser[v5.0.0, v5.0.1, v5.0.2, v5.1.0]. - Conclusion: don't install nikic/php-parser v5.1.0 (conflict analysis result) Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.