This section provides information on support for Integrated Composer.
The version of Composer on the platform is Composer 2.
Some packages are not compatible with Composer 2. If you encounter a build error that instructs you to contact Support, validate the package version's compatibility locally first, and check Drupal's Preparing your site for Composer 2 documentation for packages that have already been identified.
Pantheon supports the version of Composer integrated into the Pantheon platform and available for use with all Drupal 8+ and WordPress sites. Pantheon’s support for Composer is limited to the application level, and any Composer scripts or modifications made with a Composer script are outside the Pantheon Scope of Support.