Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires cpsit/typo3-handlebars * -> satisfiable by cpsit/typo3-handlebars[0.5.0, ..., 0.7.26]. - cpsit/typo3-handlebars[0.5.0, ..., 0.7.8] require php ^7.1 || 8.0.* -> your php version (8.2.30) does not satisfy that requirement. - cpsit/typo3-handlebars[0.7.9, ..., 0.7.20] require php >= 7.1 < 8.2 -> your php version (8.2.30) does not satisfy that requirement. - cpsit/typo3-handlebars[0.7.21, ..., 0.7.26] require typo3/cms-core ~10.4.0 || ~11.5.0 -> found typo3/cms-core[v10.4.0, ..., v10.4.37, v11.5.0, ..., v11.5.41] but it conflicts with your root composer.json require (^13.4).