Drupal ^8.8 || ^9 Upgrade - Resolving Composer 1 - 2 Issues | Tutorial The Topic: Composer 2 is installed globally on the server. We have Drupal 8 sites running on the server that have plugins and Drupal-composer plugins compatible with Composer 1. Site Location Drupal Academy Tags Drupal 8 Drupal 9 Composer Drupal upgrade