You have "Plugin Version and Build Release Checking" turned off in CB > Configuration > Integrations so you won't see build releases.
You also have the issue of being on MariaDB 5.5.52. In order to support Joomla 4 our minimum is 10.0.0 for MariaDB (MySQL 5.6+ equivalent). So you'll need to talk with your host about upgrading your database first. Once done install latest CB release and update all your plugins.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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