Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires simplesamlphp/simplesamlphp ^2.5 -> satisfiable by simplesamlphp/simplesamlphp[v2.5.2]. - simplesamlphp/simplesamlphp v2.5.2 requires simplesamlphp/saml2 ~6.1 -> satisfiable by simplesamlphp/saml2[dev-master, v6.1.0, ..., v6.2.3] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 v7.0.x-dev is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. Problem 2 - Root composer.json requires maglnet/composer-require-checker ^4.20 -> satisfiable by maglnet/composer-require-checker[4.20.0, ..., 4.24.0]. - maglnet/composer-require-checker 4.20.0 requires php ~8.3.0 || ~8.4.0 || ~8.5.0 -> your php version (8.6.0-dev) does not satisfy that requirement. - maglnet/composer-require-checker[4.21.0, ..., 4.24.0] require php ~8.4.0 || ~8.5.0 -> your php version (8.6.0-dev) does not satisfy that requirement.