Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/yaml ^7.0.0 -> satisfiable by symfony/yaml[v7.0.0]. - symfony/yaml v7.0.0 requires php >=8.2 -> your php version (8.1.26) does not satisfy that requirement. Problem 2 - enlightn/security-checker v1.11.0 requires symfony/yaml ^3.4|^4|^5|^6|^7 -> satisfiable by symfony/yaml[v7.0.0]. - enlightn/security-checker v1.10.0 requires symfony/yaml ^3.4|^4|^5|^6 -> found symfony/yaml[v3.4.0, ..., v3.4.47, v4.0.0, ..., v4.4.45, v5.0.0, ..., v5.4.31, v6.0.0, ..., v6.4.0] but it conflicts with your root composer.json require (^7.0.0). - symfony/yaml v7.0.0 requires php >=8.2 -> your php version (8.1.26) does not satisfy that requirement. - Root composer.json requires enlightn/security-checker ^1.10 -> satisfiable by enlightn/security-checker[v1.10.0, v1.11.0]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.