Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^8.3 but your php version (8.1.34) does not satisfy that requirement. Problem 2 - Root composer.json requires simplesamlphp/assert ^2.0.0 -> satisfiable by simplesamlphp/assert[v2.0.0, v2.0.1, v2.0.2]. - simplesamlphp/assert[v2.0.0, ..., v2.0.2] require php ^8.3 -> your php version (8.1.34) does not satisfy that requirement. Problem 3 - Root composer.json requires simplesamlphp/simplesamlphp >=2.5.0 <2.6.0 -> satisfiable by simplesamlphp/simplesamlphp[v2.5.0]. - simplesamlphp/simplesamlphp v2.5.0 requires php ^8.3 -> your php version (8.1.34) does not satisfy that requirement. Problem 4 - Root composer.json requires simplesamlphp/simplesamlphp-test-framework ^1.11.2 -> satisfiable by simplesamlphp/simplesamlphp-test-framework[v1.11.2, v1.11.3]. - simplesamlphp/simplesamlphp-test-framework[v1.11.2, ..., v1.11.3] require php ^8.3 -> your php version (8.1.34) does not satisfy that requirement.