diff --git a/src/CalendarEvent.php b/src/CalendarEvent.php
index 9d1cc2b..525f3dd 100644
--- a/src/CalendarEvent.php
+++ b/src/CalendarEvent.php
@@ -7,6 +7,7 @@ use Drupal\Core\Entity\ContentEntityInterface;
 /**
  * Defines a calendar event object.
  */
+#[\AllowDynamicProperties]
 class CalendarEvent {
 
   /**