diff --git a/src/Models/Lead.php b/src/Models/Lead.php
index 1aa9505..fad3369 100644
--- a/src/Models/Lead.php
+++ b/src/Models/Lead.php
@@ -43,6 +43,7 @@ class Lead extends AbstractModel
         'notes',
         'modified_user_id',
         'loss_reason_id',
+        'contacts_id',
     ];
 
     /**