Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires vimeo/psalm ^5.26.1 -> satisfiable by vimeo/psalm[5.26.1]. - Conclusion: don't install phpunit/phpunit 11.3.6 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 11.3.5 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 11.3.2 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 11.3.1 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 11.2.7 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 11.2.3 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 11.0.0 (conflict analysis result) - phpunit/phpunit[11.4.2, ..., 11.5.0] require phpunit/php-code-coverage ^11.0.7 -> satisfiable by phpunit/php-code-coverage[11.0.7]. - phpunit/php-code-coverage 11.0.7 requires nikic/php-parser ^5.3.1 -> satisfiable by nikic/php-parser[v5.3.1]. - Conclusion: don't install nikic/php-parser v5.3.1 (conflict analysis result) - Root composer.json requires phpunit/phpunit ^11.0.0 -> satisfiable by phpunit/phpunit[11.0.0, ..., 11.5.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.