Your requirements could not be resolved to an installable set of packages. Problem 1 - yiisoft/yii-debug dev-master requires php ^8.1 -> your php version (8.0.30) does not satisfy that requirement. - yiisoft/yii-debug 3.0.x-dev is an alias of yiisoft/yii-debug dev-master and thus requires it to be installed too. - Root composer.json requires yiisoft/yii-debug ^3.0@dev -> satisfiable by yiisoft/yii-debug[3.0.x-dev (alias of dev-master)].