Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires matthiasnoback/symfony-dependency-injection-test ^4.3 -> satisfiable by matthiasnoback/symfony-dependency-injection-test[4.3.0, v4.3.1]. - matthiasnoback/symfony-dependency-injection-test[4.3.0, ..., v4.3.1] require symfony/dependency-injection ^4.4 || ^5.3 || ^6.0 -> found symfony/dependency-injection[v4.4.0, ..., v4.4.49, v5.3.0, ..., v5.4.48, v6.0.0, ..., v6.4.16] but these were not loaded, likely because it conflicts with another require. Problem 2 - Root composer.json requires sylius/calendar ^0.5.0 -> satisfiable by sylius/calendar[v0.5.0]. - sylius/calendar v0.5.0 requires symfony/framework-bundle ^5.4 || ^6.0 -> found symfony/framework-bundle[v5.4.0, ..., v5.4.45, v6.0.0, ..., v6.4.13] but these were not loaded, likely because it conflicts with another require. Problem 3 - Root composer.json requires symfony/webpack-encore-bundle ^1.15 -> satisfiable by symfony/webpack-encore-bundle[v1.15.0, ..., v1.17.2]. - symfony/webpack-encore-bundle[v1.15.0, ..., v1.17.2] require symfony/asset ^4.4 || ^5.0 || ^6.0 -> found symfony/asset[v4.4.0, ..., v4.4.46, v5.0.0, ..., v5.4.45, v6.0.0, ..., v6.4.13] but these were not loaded, likely because it conflicts with another require. Problem 4 - Root composer.json requires vimeo/psalm 4.23.0 -> satisfiable by vimeo/psalm[4.23.0]. - vimeo/psalm 4.23.0 requires symfony/console ^3.4.17 || ^4.1.6 || ^5.0 || ^6.0 -> found symfony/console[v3.4.17, ..., v3.4.47, v4.1.6, ..., v4.4.49, v5.0.0, ..., v5.4.47, v6.0.0, ..., v6.4.15] but these were not loaded, likely because it conflicts with another require. Problem 5 - Root composer.json requires sensiolabs/security-checker ^6.0 -> satisfiable by sensiolabs/security-checker[v6.0.0, v6.0.1, v6.0.2, v6.0.3]. - sensiolabs/security-checker[v6.0.0, ..., v6.0.2] require symfony/console ^2.8|^3.4|^4.2 -> found symfony/console[v2.8.0, ..., v2.8.52, v3.4.0, ..., v3.4.47, v4.2.0, ..., v4.4.49] but these were not loaded, likely because it conflicts with another require. - sensiolabs/security-checker v6.0.3 requires symfony/console ^2.8|^3.4|^4.2|^5.0 -> found symfony/console[v2.8.0, ..., v2.8.52, v3.4.0, ..., v3.4.47, v4.2.0, ..., v4.4.49, v5.0.0, ..., v5.4.47] but these were not loaded, likely because it conflicts with another require.