Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires vimeo/psalm ^6.0.0 -> satisfiable by vimeo/psalm[6.0.0]. - Conclusion: don't install nikic/php-parser v4.19.1 (conflict analysis result) - Conclusion: don't install maglnet/composer-require-checker 4.10.0 (conflict analysis result) - Conclusion: don't install maglnet/composer-require-checker 4.9.0 (conflict analysis result) - Conclusion: don't install maglnet/composer-require-checker 4.8.0 (conflict analysis result) - Conclusion: don't install maglnet/composer-require-checker 4.7.1 (conflict analysis result) - maglnet/composer-require-checker[4.13.0, ..., 4.14.0] require nikic/php-parser ^4.19.4 -> satisfiable by nikic/php-parser[v4.19.4]. - maglnet/composer-require-checker[4.11.0, ..., 4.12.0] require nikic/php-parser ^4.19.1 -> satisfiable by nikic/php-parser[v4.19.1, v4.19.2, v4.19.3, v4.19.4]. - Conclusion: don't install nikic/php-parser v4.19.4 (conflict analysis result) - Root composer.json requires maglnet/composer-require-checker ^4.7.1 -> satisfiable by maglnet/composer-require-checker[4.7.1, ..., 4.14.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.