Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires vimeo/psalm ^5.24.0 -> satisfiable by vimeo/psalm[5.24.0]. - vimeo/psalm 5.24.0 requires nikic/php-parser ^4.16 -> found nikic/php-parser[v4.16.0, ..., v4.19.1] but it conflicts with your root composer.json require (^5.0.2). Problem 2 - vimeo/psalm 5.24.0 requires nikic/php-parser ^4.16 -> found nikic/php-parser[v4.16.0, ..., v4.19.1] but it conflicts with your root composer.json require (^5.0.2). - roave/infection-static-analysis-plugin 1.35.0 requires vimeo/psalm ^4.30.0 || ^5.15 -> satisfiable by vimeo/psalm[5.24.0]. - 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.