Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires psalm/plugin-phpunit ^0.18.4 -> satisfiable by psalm/plugin-phpunit[0.18.4]. - Conclusion: don't install nikic/php-parser v5.3.1 (conflict analysis result) - Conclusion: don't install nikic/php-parser[v5.1.0] | install one of vimeo/psalm[5.19.0, ..., 5.21.1], nikic/php-parser[v4.16.0, v4.17.1] (conflict analysis result) - Conclusion: don't install nikic/php-parser v4.17.1 (conflict analysis result) - Conclusion: don't install nikic/php-parser v4.16.0 (conflict analysis result) - Conclusion: don't install nikic/php-parser[v5.0.0] | install one of vimeo/psalm[5.19.0, ..., 5.21.1] (conflict analysis result) - vimeo/psalm[5.19.1, ..., 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]. - 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]. - Conclusion: don't install one of sebastian/diff[6.0.2], vimeo/psalm[5.19.0] (conflict analysis result) - Conclusion: install sebastian/diff 6.0.2 (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 ^5.19 -> satisfiable by vimeo/psalm[5.19.0, ..., 5.26.1]. - phpunit/phpunit 11.4.2 requires phpunit/php-code-coverage ^11.0.7 -> satisfiable by phpunit/php-code-coverage[11.0.7]. - phpunit/phpunit[11.3.2, ..., 11.4.1] require phpunit/php-code-coverage ^11.0.6 -> satisfiable by phpunit/php-code-coverage[11.0.6, 11.0.7]. - 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, 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]. - phpunit/php-code-coverage 11.0.6 requires nikic/php-parser ^5.1.0 -> satisfiable by nikic/php-parser[v5.1.0, v5.2.0, v5.3.0, v5.3.1]. - phpunit/php-code-coverage[11.0.0, ..., 11.0.5] require nikic/php-parser ^5.0 -> satisfiable by nikic/php-parser[v5.0.0, ..., v5.3.1]. - Conclusion: don't install phpunit/phpunit[11.2.7] | 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, ..., 11.4.2]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.