diff --git a/src/JamesMoss/Flywheel/Document.php b/src/JamesMoss/Flywheel/Document.php
index fc64a76..55d9a02 100644
--- a/src/JamesMoss/Flywheel/Document.php
+++ b/src/JamesMoss/Flywheel/Document.php
@@ -12,6 +12,7 @@
  * to ensure uniqueness when storing a document. You can set this yourself using
  * the `setId()` method or if omitted it will be autogenerated for you.
  */
+#[AllowDynamicProperties]
 class Document implements DocumentInterface
 {
     protected $__flywheelDocId;