Your requirements could not be resolved to an installable set of packages. Problem 1 - nette/command-line dev-master requires php 8.1 - 8.3 -> your php version (8.0.30) does not satisfy that requirement. - nette/command-line 2.0.x-dev is an alias of nette/command-line dev-master and thus requires it to be installed too. - Root composer.json requires nette/command-line ^2.0 -> satisfiable by nette/command-line[2.0.x-dev (alias of dev-master)].