Your requirements could not be resolved to an installable set of packages. Problem 1 - Conclusion: don't install laminas/laminas-session 2.21.0 (conflict analysis result) - Root composer.json requires laminas/laminas-session ^2.21.0 -> satisfiable by laminas/laminas-session[2.21.0, 2.22.0]. - Root composer.json requires laminas/laminas-validator ^3.0.0 -> satisfiable by laminas/laminas-validator[3.0.0, 3.0.1]. - Conclusion: don't install laminas/laminas-servicemanager 4.1.0 (conflict analysis result) - laminas/laminas-validator[3.0.0, ..., 3.0.1] require laminas/laminas-servicemanager ^4.1.0 -> satisfiable by laminas/laminas-servicemanager[4.1.0, 4.2.0, 4.2.1, 4.3.0]. - You can only install one version of a package, so only one of these can be installed: laminas/laminas-servicemanager[3.22.0, 3.22.1, 3.23.0, 4.1.0, 4.2.0, 4.2.1, 4.3.0]. - laminas/laminas-session 2.22.0 requires laminas/laminas-servicemanager ^3.22 -> satisfiable by laminas/laminas-servicemanager[3.22.0, 3.22.1, 3.23.0]. - Conclusion: don't install laminas/laminas-servicemanager[3.22.0] | install laminas/laminas-servicemanager[4.1.0] (conflict analysis result) Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.