diff --git a/src/Model/AbnResponse.php b/src/Model/AbnResponse.php
index 159f744..38601e8 100644
--- a/src/Model/AbnResponse.php
+++ b/src/Model/AbnResponse.php
@@ -27,7 +27,7 @@ final class AbnResponse extends AbstractResponse
 
     #[SerializedName('AddressDate')]
     #[NotBlank]
-    public \DateTimeImmutable $addressDate;
+    public ?\DateTimeImmutable $addressDate = null;
 
     #[SerializedName('AddressPostcode')]
     public string $addressPostcode;
diff --git a/tests/Integration/AbnClientTest.php b/tests/Integration/AbnClientTest.php
index cbb8d97..bb002da 100644
--- a/tests/Integration/AbnClientTest.php
+++ b/tests/Integration/AbnClientTest.php
@@ -125,7 +125,7 @@ public function testLookupAbnSuccess(): void
             'AbnStatus'              => $response->abnStatus,
             'AbnStatusEffectiveFrom' => $response->abnStatusEffectiveFrom->format('Y-m-d'),
             'Acn'                    => $response->acn,
-            'AddressDate'            => $response->addressDate->format('Y-m-d'),
+            'AddressDate'            => $response->addressDate?->format('Y-m-d'),
             'AddressPostcode'        => $response->addressPostcode,
             'AddressState'           => $response->addressState,
             'BusinessName'           => $response->businessNames,