Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires behat/behat ^3.18 -> satisfiable by behat/behat[v3.18.0, v3.18.1, 3.x-dev]. - behat/behat[v3.18.0, ..., 3.x-dev] require php 8.1.* || 8.2.* || 8.3.* || 8.4.* -> your php version (5.6; overridden via config.platform, actual: 8.4.3) does not satisfy that requirement. Problem 2 - Root composer.json requires wp-cli/wp-cli-tests dev-code-coverage -> satisfiable by wp-cli/wp-cli-tests[dev-code-coverage]. - behat/behat[v3.18.0, ..., 3.x-dev] require php 8.1.* || 8.2.* || 8.3.* || 8.4.* -> your php version (5.6; overridden via config.platform, actual: 8.4.3) does not satisfy that requirement. - wp-cli/wp-cli-tests dev-code-coverage requires behat/behat ^3.7 -> satisfiable by behat/behat[v3.18.0, v3.18.1, 3.x-dev].