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Is claro_compact compatible with Drupal 11?

Yes. claro_compact supports Drupal 11 from version 2.1.0.

Projectdrupal.org/project/claro_compact (theme)
What it doesA compact version of Claro (Drupal administration theme). Fully compatible with Claro, just with the overall spacing reduced.
Latest stable release2.1.0 (core: ^8 || ^9 || ^10 || ^11)
First release supporting Drupal 112.1.0
Best upgrade step (runs on 10 and 11)2.1.0
Drupal 12Not declared yet
Maintenance statusActively maintained
Security advisory coveragecovered

Upgrading from Drupal 10

While you're still on Drupal 10, update claro_compact to 2.1.0 with composer require drupal/claro_compact:^2.1. Then run drush updb. That release works on both 10 and 11, so it won't block the core upgrade.

Drupal 10 security support ends on December 9, 2026. To see every module on your site at once, scan your composer.lock. The scan is free, runs in your browser, and gives you a fixed price for the whole upgrade.