Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires localgovdrupal/localgov_alert_banner dev-1.8.x as 1.7.8, found localgovdrupal/localgov_alert_banner[dev-fix/typo-in-cache-context-name, ..., dev-245_alert_banner_with_empty_link_text_should_show_more_information_but_nothing_shows, 1.0.0-alpha1, ..., 1.x-dev] but it does not match the constraint. Problem 2 - localgovdrupal/localgov is locked to version 3.x-dev and an update of this package was not requested. - localgovdrupal/localgov 3.x-dev requires localgovdrupal/localgov_alert_banner ^1.2.0 -> found localgovdrupal/localgov_alert_banner[1.2.0, ..., 1.x-dev] but it conflicts with your root composer.json require (dev-1.8.x as 1.7.8).