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Is bootstrap5 compatible with Drupal 11?

Yes. bootstrap5 supports Drupal 11 from version 4.0.3.

Projectdrupal.org/project/bootstrap5 (theme)
What it doesMaster theme using Bootstrap 5: powerful front-end framework for faster and easier web development.
Latest stable release4.0.8 (core: ^10.1 || ^11.0)
First release supporting Drupal 114.0.3
Best upgrade step (runs on 10 and 11)4.0.8
Drupal 12Not declared yet
Maintenance statusActively maintained
Security advisory coveragecovered

Upgrading from Drupal 10

While you're still on Drupal 10, update bootstrap5 to 4.0.8 with composer require drupal/bootstrap5:^4.0. 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.