diff --git a/src/Unzer.php b/src/Unzer.php
index a23adf1a..65faadf8 100644
--- a/src/Unzer.php
+++ b/src/Unzer.php
@@ -63,7 +63,7 @@ class Unzer implements UnzerParentInterface, PaymentServiceInterface, ResourceSe
     public const BASE_URL = 'api.unzer.com';
     public const API_VERSION = 'v1';
     public const SDK_TYPE = 'UnzerPHP';
-    public const SDK_VERSION = '1.1.1.0';
+    public const SDK_VERSION = '1.1.1.1';
 
     /** @var string $key */
     private $key;