Your requirements could not be resolved to an installable set of packages. Problem 1 - phpactor/completion-extension dev-master requires phpactor/container ^2.0.0 -> found phpactor/container[dev-master, 2.0.0, ..., 2.2.1] but it conflicts with your root composer.json require (^3.0). - phpactor/completion-extension[0.2.0, ..., 0.2.1] require phpactor/container ^1.0 -> found phpactor/container[1.0.0, ..., 1.3.3] but it conflicts with your root composer.json require (^3.0). - phpactor/completion-extension[0.2.2, ..., 0.2.3] require php ^7.3 -> your php version (8.1.2) does not satisfy that requirement. - phpactor/completion-extension 0.2.x-dev is an alias of phpactor/completion-extension dev-master and thus requires it to be installed too. - Root composer.json requires phpactor/completion-extension ~0.2 -> satisfiable by phpactor/completion-extension[0.2.0, ..., 0.2.x-dev (alias of dev-master)].