Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires jwage/changelog-generator ^1.4.0 -> satisfiable by jwage/changelog-generator[1.4.0]. - jwage/changelog-generator 1.4.0 requires laminas/laminas-diactoros ^2.13.0 -> found laminas/laminas-diactoros[2.13.0, ..., 2.26.0] but it conflicts with your root composer.json require (^3.3.1). Problem 2 - Root composer.json requires phly/keep-a-changelog ^2.12.1 -> satisfiable by phly/keep-a-changelog[2.12.1]. - phly/keep-a-changelog 2.12.1 requires laminas/laminas-diactoros ^2.4.1 -> found laminas/laminas-diactoros[2.4.1, ..., 2.26.0] but it conflicts with your root composer.json require (^3.3.1). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.