Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires roave/no-leaks ^1.5.0 -> satisfiable by roave/no-leaks[1.5.0]. - roave/no-leaks 1.5.0 requires phpunit/phpunit ^9.6.10 -> found phpunit/phpunit[9.6.10, ..., 9.6.22] but it conflicts with your root composer.json require (^11.5.1). Problem 2 - Root composer.json requires phpunit/phpunit ^11.5.1 -> satisfiable by phpunit/phpunit[11.5.1]. - infection/infection 0.27.10 requires nikic/php-parser ^4.15.1 -> satisfiable by nikic/php-parser[v4.15.1, ..., v4.19.4]. - You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.15.1, ..., v4.19.4, v5.0.0, ..., v5.3.1]. - phpunit/php-code-coverage[11.0.7, ..., 11.0.8] require nikic/php-parser ^5.3.1 -> satisfiable by nikic/php-parser[v5.3.1]. - roave/infection-static-analysis-plugin 1.35.0 requires infection/infection 0.27.10 -> satisfiable by infection/infection[0.27.10]. - phpunit/phpunit 11.5.1 requires phpunit/php-code-coverage ^11.0.7 -> satisfiable by phpunit/php-code-coverage[11.0.7, 11.0.8]. - Root composer.json requires roave/infection-static-analysis-plugin ^1.35.0 -> satisfiable by roave/infection-static-analysis-plugin[1.35.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.