Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires wyrihaximus/async-test-utilities ^10.7.0 -> satisfiable by wyrihaximus/async-test-utilities[10.7.0]. - Root composer.json requires wyrihaximus/makefiles ^0.8.0 -> satisfiable by wyrihaximus/makefiles[0.8.0]. - wyrihaximus/async-test-utilities 10.7.0 requires wyrihaximus/test-utilities ^8.8.0 -> satisfiable by wyrihaximus/test-utilities[8.8.0]. - wyrihaximus/makefiles 0.8.0 conflicts with infection/infection 0.31.9. - wyrihaximus/test-utilities 8.8.0 requires infection/infection ^0.31.9 -> satisfiable by infection/infection[0.31.9]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.