diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3228607..baeddfd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,7 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 - Add `AccountSecurity.visibleAutosignRoleOption` in to resource
 - Add `AccountSecurity.visibleNoneSignerChannelOption` in to resource
 - Add `BatchSendingsEndpoint.stats` endpoint
-- Extend `BatchSending` resource
+- Extend `BatchSending` and `BatchSendingItem` resource
 
 ## [2.5.0] - 2024-10-14
 - Add `AccountBilling.automaticTagsPlacement`
diff --git a/src/Resource/BatchSendingItem.php b/src/Resource/BatchSendingItem.php
index 8335a69..918face 100644
--- a/src/Resource/BatchSendingItem.php
+++ b/src/Resource/BatchSendingItem.php
@@ -13,7 +13,7 @@ class BatchSendingItem extends BaseResource
 
     public string $name;
 
-    public ?string $envelopeId;
+    public ?Envelope $envelope;
 
     public string $status;