diff --git a/composer.json b/composer.json
index ab55d86..b7d5407 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,6 @@
         "php": ">=5.5.9",
         "ext-curl": "*"
     },
-    "version": "1.0.12",
+    "version": "1.0.13",
     "minimum-stability": "dev"
 }
diff --git a/src/Client.php b/src/Client.php
index 1ad0eba..a6cee50 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -96,7 +96,7 @@ public function request($path, $params = null, $method = 'POST', $fullPath = fal
                 break;
             case 'POST':
                 curl_setopt($ch, CURLOPT_POST, 1);
-                curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
+                curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($params));
                 break;
             case 'DELETE':
                 curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');