Your requirements could not be resolved to an installable set of packages. Problem 1 - laminas/laminas-escaper is locked to version 2.12.0 and an update of this package was not requested. - laminas/laminas-escaper 2.12.0 requires php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.3.0alpha3) does not satisfy that requirement. Problem 2 - mpdf/mpdf is locked to version v8.2.0 and an update of this package was not requested. - mpdf/mpdf v8.2.0 requires php ^5.6 || ^7.0 || ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.3.0alpha3) does not satisfy that requirement. Problem 3 - laminas/laminas-code 4.7.1 requires php >=7.4, <8.2 -> your php version (8.3.0alpha3) does not satisfy that requirement. - laminas/laminas-code 4.12.0 requires php ~8.1.0 || ~8.2.0 -> your php version (8.3.0alpha3) does not satisfy that requirement. - Root composer.json requires laminas/laminas-code 4.7.1 || 4.12.0 -> satisfiable by laminas/laminas-code[4.7.1, 4.12.0].