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New Doc: Upgrade Drupal 8 to Drupal 9 with Integrated Composer

New doc in the growing Get to Drupal 9 Guide shows how to upgrade from Drupal 8 to Drupal 9 with Integrated Composer!

This doc utilizes Pantheon’s Multidev environments to help users convert a Drupal 8 site to a Composer-managed Drupal 9 site safely, turning a potentially precarious upgrade into a reversible process.

Check it out, try it out, and if you spot something we should update/change. Let us know here or in a GitHub issue.

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