>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3135811. --> Reported by: [sarvjeetsingh](https://www.drupal.org/user/3637489) >>> <p>Make this project compatible for drupal 9.<br> <strong>suggestions: </strong> </p> <ul> <li>use drupal-check, rector , upgrade_status module to check the changes need to be done</li> <li>Add <code>core_version_requirement: ^8 || ^9</code> in thermometer.info.yml file.</li> </ul>