diff --git a/lib/RetailCrm/ApiClient.php b/lib/RetailCrm/ApiClient.php
index 9d246a3..7fb1810 100644
--- a/lib/RetailCrm/ApiClient.php
+++ b/lib/RetailCrm/ApiClient.php
@@ -999,7 +999,7 @@ class ApiClient
         return $this->client->makeRequest(
             sprintf('/delivery/generic/%s/tracking', $code),
             Client::METHOD_POST,
-            $statusUpdate
+            array('statusUpdate' => json_encode($statusUpdate))
         );
     }