Call to undefined triggers

With CiviRules 2.20 (CiviCRM 5.27.5), we're seeing errors with creating conditions when creating rules for several triggers. Example for the individual birthday trigger. Is there something else that needs to be updated along with CiviRules in order for this to work?

Error: Call to undefined method CRM_CivirulesCronTrigger_Birthday::getObjectName() in CRM_CivirulesConditions_Generic_HasTag->doesWorkWithTrigger() (line 191 of /var/www/wwwadmin/data/www/XXXXX/sites/default/files/civicrm/extensions/org.civicoop.civirules/CRM/CivirulesConditions/Generic/HasTag.php).

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