Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires laminas/laminas-mvc ^3.8.0, found laminas/laminas-mvc[3.8.x-dev] but it does not match your minimum-stability. Problem 2 - Root composer.json requires laminas/laminas-mvc-plugin-flashmessenger ^1.10.1 -> satisfiable by laminas/laminas-mvc-plugin-flashmessenger[1.10.1]. - laminas/laminas-mvc-plugin-flashmessenger 1.10.1 requires laminas/laminas-mvc ^3.3 -> found laminas/laminas-mvc[3.3.0, ..., 3.7.0] but it conflicts with your root composer.json require (^3.8.0). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.