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1. Prepare for upgrade

• Make sure you have composer 2 running on your environment.

• https://joostvanveen.com/run-composer-1-and-2-simultaniously - if you want to know how to run 2 versions of composer simultaneously, follow this article

• Make sure you have PHP 7.4 on your local and MariaDB >10.4

• Install Upgrade Status module on your local copy of the site, check the statsstatus of your installed modules

2. Upgrade on your local

• Update your local database to the version you intend to use on the host

• Based on the statsstatus, perform required actions: upgrade or patch contrib modules

• Patch / update custom modules

• Uninstall unused modules

• Update Drupal core:

  • Replace drupal/core package with drupal/core-recommended

  • Remove drupal/core-dev from dev dependencies

• Follow this guide to check other packages: https://www.drupal.org/docs/develop/using-composer/preparing-your-site-for-composer-2

• Tun database updates on your local, export config

• Check site status and smoke test the site

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Feel free to update pantheon.yml file to remove any non-required values that are duplicates with duplicated in this new file. Make sure you keep api_version: 1 in both.

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Official Pantheon documentation: https://pantheon.io/docs/guides/drupal-9-migration

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