>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3189198. --> Reported by: [mglaman](https://www.drupal.org/user/2416470) Related to !1 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>The module cannot be installed on Drupal 9, making none of the JSON:API D9 compatible.</p> <pre>&nbsp; Problem 1<br>&nbsp;&nbsp;&nbsp; - drupal/jsonapi_user_resources[1.0.0-alpha1, ..., 1.0.0-alpha3] require drupal/core ^8.8@alpha -&gt; found drupal/core[8.8.0-alpha1, ..., 8.9.11] but the package is fixed to 9.1.0 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.<br>&nbsp;&nbsp;&nbsp; - Root composer.json requires drupal/jsonapi_user_resources ^1.0@alpha -&gt; satisfiable by drupal/jsonapi_user_resources[1.0.0-alpha1, 1.0.0-alpha2, 1.0.0-alpha3].</pre><p>This also unblocks proper testing of <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/jsonapi_resources/-/work_items/3187549" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/jsonapi_resources/-/work_items/3187549</a></span>.</p>