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Is jquery_ui_autocomplete compatible with Drupal 11?

Yes. jquery_ui_autocomplete supports Drupal 11 from version 2.1.0.

Projectdrupal.org/project/jquery_ui_autocomplete (module)
What it doesProvides jQuery UI Autocomplete library.
Latest stable release2.1.0 (core: ^9.2 || ^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 jquery_ui_autocomplete to 2.1.0 with composer require drupal/jquery_ui_autocomplete:^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.