Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires toolkit/extlib dev-main -> satisfiable by toolkit/extlib[dev-main]. - toolkit/extlib dev-main requires toolkit/fsutil ^1.0 -> found toolkit/fsutil[v1.0.0, ..., v1.1.2] but it conflicts with your root composer.json require (^2.0). Problem 2 - Root composer.json requires symfony/expression-language ^7.0 -> satisfiable by symfony/expression-language[v7.0.0, v7.0.2, v7.0.3]. - symfony/expression-language[v7.0.0, ..., v7.0.3] require php >=8.2 -> your php version (8.1.27) does not satisfy that requirement. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.