diff --git a/composer.json b/composer.json
index 7cd2cc9..f2fdcac 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "buckaroo/sdk",
     "description": "Buckaroo payment SDK",
     "license": "MIT",
-    "version": "1.17.0",
+    "version": "1.17.1",
     "type": "library",
     "require": {
         "php": "^8.1",
diff --git a/src/Handlers/HMAC/Hmac.php b/src/Handlers/HMAC/Hmac.php
index 5b3befb..09d1636 100644
--- a/src/Handlers/HMAC/Hmac.php
+++ b/src/Handlers/HMAC/Hmac.php
@@ -51,7 +51,7 @@ public function base64Data($data = null)
             if (is_array($data))
             {
                 $data = mb_convert_encoding(
-                    json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE),
+                    json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRESERVE_ZERO_FRACTION),
                     'UTF-8',
                     'auto'
                 );