Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires acquia/drupal-spec-tool * -> satisfiable by acquia/drupal-spec-tool[dev-master]. - acquia/drupal-spec-tool dev-master requires drupal/core ^10.0.0-alpha1 -> found drupal/core[10.0.0-alpha1, ..., 10.2.x-dev] but it conflicts with your root composer.json require (11.x-dev). Problem 2 - Root composer.json requires drupal/config_sync_without_site_uuid ^1.0@beta -> satisfiable by drupal/config_sync_without_site_uuid[1.0.0-beta1]. - drupal/config_sync_without_site_uuid 1.0.0-beta1 requires drupal/core ^9 || ^10 -> found drupal/core[9.0.0-alpha1, ..., 9.5.x-dev, 10.0.0-alpha1, ..., 10.2.x-dev] but it conflicts with your root composer.json require (11.x-dev). Problem 3 - drupal/memcache[2.0.0-alpha1, ..., 2.0.0] require drupal/core ~8.0 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev] but it conflicts with your root composer.json require (11.x-dev). - drupal/memcache 2.1.0 requires drupal/core ^8 || ^9 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (11.x-dev). - drupal/memcache[2.2.0-rc1, ..., 2.2.0] require drupal/core ^8.8 || ^9 -> found drupal/core[8.8.0-alpha1, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (11.x-dev). - drupal/memcache 2.3.0 requires drupal/core ^8.9 || ^9 -> found drupal/core[8.9.0-beta1, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (11.x-dev). - drupal/memcache[2.4.0, ..., 2.x-dev] require drupal/core ^9.1 || ^10 -> found drupal/core[9.1.0-alpha1, ..., 9.5.x-dev, 10.0.0-alpha1, ..., 10.2.x-dev] but it conflicts with your root composer.json require (11.x-dev). - acquia/memcache-settings 1.x-dev is an alias of acquia/memcache-settings dev-main and thus requires it to be installed too. - acquia/memcache-settings dev-main requires drupal/memcache ^2.0 -> satisfiable by drupal/memcache[2.0.0-alpha1, ..., 2.x-dev]. - Root composer.json requires acquia/memcache-settings 1.x-dev -> satisfiable by acquia/memcache-settings[1.x-dev (alias of dev-main)].