Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires mezzio/mezzio-platesrenderer ^2.9.0 -> satisfiable by mezzio/mezzio-platesrenderer[2.9.0]. - mezzio/mezzio-platesrenderer 2.9.0 requires php ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.3.0RC3) does not satisfy that requirement. Problem 2 - Root composer.json requires phly/phly-configfactory ^1.2.0 -> satisfiable by phly/phly-configfactory[1.2.0]. - phly/phly-configfactory 1.2.0 requires php ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.3.0RC3) does not satisfy that requirement. Problem 3 - Root composer.json requires phly/phly-event-dispatcher ^1.3.1 -> satisfiable by phly/phly-event-dispatcher[1.3.1]. - phly/phly-event-dispatcher 1.3.1 requires php ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.3.0RC3) does not satisfy that requirement. Problem 4 - mezzio/mezzio-tooling 2.6.0 requires php ^7.4 || ~8.0.0 || ~8.1.0 -> your php version (8.3.0RC3) does not satisfy that requirement. - mezzio/mezzio-tooling[2.7.0, ..., 2.8.0] require php ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.3.0RC3) does not satisfy that requirement. - Root composer.json requires mezzio/mezzio-tooling ^2.6 -> satisfiable by mezzio/mezzio-tooling[2.6.0, 2.7.0, 2.8.0].