Your requirements could not be resolved to an installable set of packages. Problem 1 - nimut/typo3-complete dev-main requires typo3/cms-adminpanel dev-main -> found typo3/cms-adminpanel[dev-main, 13.2.x-dev (alias of dev-main)] but it does not match your minimum-stability. - nimut/typo3-complete 12.0.x-dev is an alias of nimut/typo3-complete dev-main and thus requires it to be installed too. - Root composer.json requires nimut/typo3-complete 12.0.x-dev -> satisfiable by nimut/typo3-complete[12.0.x-dev (alias of dev-main)].