diff --git a/modules/charts_highcharts/src/Settings/Highcharts/PlotOptions.php b/modules/charts_highcharts/src/Settings/Highcharts/PlotOptions.php
index 6b5e63e0ce1121aad9b42f74681eaa6801d9b248..0834adb02f49a351eebf50310584104fb2c71652 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/PlotOptions.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/PlotOptions.php
@@ -5,6 +5,7 @@ namespace Drupal\charts_highcharts\Settings\Highcharts;
 /**
  * Plot Options.
  */
+#[\AllowDynamicProperties]
 class PlotOptions implements \JsonSerializable {
 
   /**