// First, VERIFY that updates of Drupal actually are available:
composer outdated "drupal/*"
// RUN THE CORE UPDATES:
composer update drupal/core webflo/drupal-core-require-dev --with-dependencies
drush updatedb
drush cr
// RUN MODULE UPDATES:
composer update drupal/modulename --with-dependencies
drush updatedb
drush cr
// FORCE UPDATE A MODULE TO A CERTAIN VERSION:
// vb:
composer require drupal/field_group:3.x-dev