Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires psalm/plugin-phpunit ^0.19 -> satisfiable by psalm/plugin-phpunit[0.19.0]. - 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 nikic/php-parser v4.16.0 (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 vimeo/psalm ^5.15 -> satisfiable by vimeo/psalm[5.15.0, ..., 5.26.1]. - Conclusion: don't install phpunit/phpunit 11.3.6 (conflict analysis result) - psalm/plugin-phpunit 0.19.0 requires vimeo/psalm dev-master || ^5@beta || ^5.0 -> satisfiable by vimeo/psalm[5.15.0, ..., 5.26.1]. - vimeo/psalm[5.22.0, ..., 5.25.0] require nikic/php-parser ^4.16 -> satisfiable by nikic/php-parser[v4.16.0, ..., v4.19.4]. - vimeo/psalm[5.26.0, ..., 5.26.1] require nikic/php-parser ^4.17 -> satisfiable by nikic/php-parser[v4.17.0, ..., v4.19.4]. - You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.16.0, ..., v4.19.4, v5.0.0, ..., v5.3.1]. - vimeo/psalm[5.15.0, ..., 5.21.1] require sebastian/diff ^4.0 || ^5.0 -> satisfiable by sebastian/diff[4.0.0, ..., 4.0.6, 5.0.0, ..., 5.1.1]. - phpunit/php-code-coverage 11.0.7 requires nikic/php-parser ^5.3.1 -> satisfiable by nikic/php-parser[v5.3.1]. - You can only install one version of a package, so only one of these can be installed: sebastian/diff[4.0.0, ..., 4.0.6, 5.0.0, ..., 5.1.1, 6.0.0, 6.0.1, 6.0.2]. - phpunit/phpunit 11.4.2 requires phpunit/php-code-coverage ^11.0.7 -> satisfiable by phpunit/php-code-coverage[11.0.7]. - phpunit/phpunit 11.4.2 requires sebastian/diff ^6.0.2 -> satisfiable by sebastian/diff[6.0.2]. - Root composer.json requires phpunit/phpunit ^11.0.0 -> satisfiable by phpunit/phpunit[11.0.0, ..., 11.4.2]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.