Your requirements could not be resolved to an installable set of packages. Problem 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) - Root composer.json requires psalm/plugin-phpunit ^0.19 -> satisfiable by psalm/plugin-phpunit[0.19.0]. - You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.0.0, ..., v4.19.4, v5.0.0, ..., v5.3.1]. - Conclusion: don't install one of sebastian/complexity[4.0.1], nikic/php-parser[v4.19.0] (conflict analysis result) - phpunit/php-code-coverage 11.0.7 requires nikic/php-parser ^5.3.1 -> satisfiable by nikic/php-parser[v5.3.1]. - phpunit/php-code-coverage 11.0.7 requires sebastian/complexity ^4.0.1 -> satisfiable by sebastian/complexity[4.0.1]. - phpunit/phpunit[11.4.2, ..., 11.4.3] require phpunit/php-code-coverage ^11.0.7 -> satisfiable by phpunit/php-code-coverage[11.0.7]. - Root composer.json requires phpunit/phpunit ^11.0 -> satisfiable by phpunit/phpunit[11.0.0, ..., 11.4.3]. - Conclusion: install one of nikic/php-parser[v4.16.0, v4.17.1, v4.19.0] (conflict analysis result) Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.