Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nette/command-line ^2.0 -> satisfiable by nette/command-line[2.0.x-dev (alias of dev-master)]. - nette/command-line dev-master requires php 8.2 - 8.5 -> your php version (8.1.34) 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.