Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires typo3/cms-backend ^14.0 -> satisfiable by typo3/cms-backend[v14.0.0]. - typo3/cms-backend v14.0.0 requires typo3/cms-core 14.0.0 -> found typo3/cms-core[v14.0.0] but it conflicts with your root composer.json require (^12.0 || ^13.0). Problem 2 - Root composer.json requires typo3/cms-dashboard ^12.0 || ^13.0 -> satisfiable by typo3/cms-dashboard[v12.4.37, v12.4.38, v12.4.39, v13.4.18, v13.4.19, v13.4.20]. - typo3/cms-dashboard v12.4.37 requires typo3/cms-backend 12.4.37 -> found typo3/cms-backend[v12.4.37] but it conflicts with your root composer.json require (^14.0). - typo3/cms-dashboard v12.4.38 requires typo3/cms-backend 12.4.38 -> found typo3/cms-backend[v12.4.38] but it conflicts with your root composer.json require (^14.0). - typo3/cms-dashboard v12.4.39 requires typo3/cms-backend 12.4.39 -> found typo3/cms-backend[v12.4.39] but it conflicts with your root composer.json require (^14.0). - typo3/cms-dashboard v13.4.18 requires typo3/cms-backend 13.4.18 -> found typo3/cms-backend[v13.4.18] but it conflicts with your root composer.json require (^14.0). - typo3/cms-dashboard v13.4.19 requires typo3/cms-backend 13.4.19 -> found typo3/cms-backend[v13.4.19] but it conflicts with your root composer.json require (^14.0). - typo3/cms-dashboard v13.4.20 requires typo3/cms-backend 13.4.20 -> found typo3/cms-backend[v13.4.20] but it conflicts with your root composer.json require (^14.0).