Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires typo3/cms-backend 12.2.x-dev (exact version match), found typo3/cms-backend[dev-main, v8.7.7, ..., 8.7.x-dev, v9.0.0, ..., 9.5.x-dev, v10.0.0, ..., 10.4.x-dev, v11.0.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev, 13.0.x-dev (alias of dev-main)] but it does not match the constraint. Problem 2 - Root composer.json requires typo3/cms-core 12.2.x-dev (exact version match), found typo3/cms-core[dev-main, v8.7.7, ..., 8.7.x-dev, v9.0.0, ..., 9.5.x-dev, v10.0.0, ..., 10.4.x-dev, v11.0.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev, 13.0.x-dev (alias of dev-main)] but it does not match the constraint. Problem 3 - Root composer.json requires typo3/cms-frontend 12.2.x-dev (exact version match), found typo3/cms-frontend[dev-main, v8.7.7, ..., 8.7.x-dev, v9.0.0, ..., 9.5.x-dev, v10.0.0, ..., 10.4.x-dev, v11.0.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev, 13.0.x-dev (alias of dev-main)] but it does not match the constraint. Problem 4 - Root composer.json requires typo3/cms-info 12.2.x-dev (exact version match), found typo3/cms-info[dev-main, v8.7.7, ..., 8.7.x-dev, v9.0.0, ..., 9.5.x-dev, v10.0.0, ..., 10.4.x-dev, v11.0.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev, 13.0.x-dev (alias of dev-main)] but it does not match the constraint. Problem 5 - Root composer.json requires typo3/cms-seo 12.2.x-dev (exact version match), found typo3/cms-seo[dev-main, v9.3.0, ..., 9.5.x-dev, v10.0.0, ..., 10.4.x-dev, v11.0.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev, 13.0.x-dev (alias of dev-main)] but it does not match the constraint. Problem 6 - saschaegerer/phpstan-typo3[1.8.0, ..., 1.8.2] require typo3/cms-core ^10.4 || ^11.5 || ^12.0 -> found typo3/cms-core[v10.4.0, ..., 10.4.x-dev, v11.5.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev] but it conflicts with your root composer.json require (12.2.x-dev). - saschaegerer/phpstan-typo3 1.8.3 requires typo3/cms-core ^10.4 || ^11.5 || ^12.2 -> found typo3/cms-core[v10.4.0, ..., 10.4.x-dev, v11.5.0, ..., 11.5.x-dev, v12.2.0, ..., 12.4.x-dev] but it conflicts with your root composer.json require (12.2.x-dev). - saschaegerer/phpstan-typo3 1.8.4 requires typo3/cms-core ^10.4 || ^11.5 || ^12.3 -> found typo3/cms-core[v10.4.0, ..., 10.4.x-dev, v11.5.0, ..., 11.5.x-dev, v12.3.0, ..., 12.4.x-dev] but it conflicts with your root composer.json require (12.2.x-dev). - saschaegerer/phpstan-typo3[1.8.5, ..., 1.9.1] require typo3/cms-core ^10.4 || ^11.5 || ^12.4 -> found typo3/cms-core[v10.4.0, ..., 10.4.x-dev, v11.5.0, ..., 11.5.x-dev, v12.4.0, ..., 12.4.x-dev] but it conflicts with your root composer.json require (12.2.x-dev). - Root composer.json requires saschaegerer/phpstan-typo3 ^1.8 -> satisfiable by saschaegerer/phpstan-typo3[1.8.0, ..., 1.9.1].