>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3187549. --> Reported by: [auth](https://www.drupal.org/user/378489) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Drupal core made the class \Drupal\jsonapi\ResourceResponse not implement CacheableResponseInterface anymore. This introduces issues for the module in 9.1. The new class Drupal\jsonapi\CacheableResourceResponse can be used on Drupal &gt;= 9.1.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Use the new class Drupal\jsonapi\CacheableResourceResponse if it exists but use \Drupal\jsonapi\ResourceResponse as a fallback to not force everyone to update to Drupal 9.1 immediately.</p>