Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^13.1.7 -> satisfiable by phpunit/phpunit[13.1.7]. - Root composer.json requires roave/infection-static-analysis-plugin ^1.43.0 -> satisfiable by roave/infection-static-analysis-plugin[1.43.0]. - infection/infection 0.32.0 requires sebastian/diff ^4.0 || ^5.0 || ^6.0 || ^7.0 -> satisfiable by sebastian/diff[4.0.0, ..., 4.0.6, 5.0.0, ..., 5.1.1, 6.0.0, 6.0.1, 6.0.2, 7.0.0]. - phpunit/phpunit 13.1.7 requires sebastian/diff ^8.1.0 -> satisfiable by sebastian/diff[8.1.0]. - roave/infection-static-analysis-plugin 1.43.0 requires infection/infection 0.32.0 -> satisfiable by infection/infection[0.32.0]. - sebastian/diff[4.0.0, ..., 4.0.1] require php ^7.3 -> your php version (8.4.13) does not satisfy that requirement. - 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, 7.0.0, 8.0.0, 8.1.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.