diff --git a/composer.json b/composer.json
index 6abdd52..ea56aac 100644
--- a/composer.json
+++ b/composer.json
@@ -17,9 +17,10 @@
   ],
   "require": {
     "php": ">=5.6",
+    "ext-json": "*",
     "symfony/framework-bundle": "~2.3||~3||~4",
     "twig/twig": "~1.24||~2",
-    "kriswallsmith/buzz": "<0.16"
+    "kriswallsmith/buzz": "^1"
   },
   "require-dev" :{
     "phpspec/phpspec": "^4.3",
diff --git a/src/Logger/Api.php b/src/Logger/Api.php
deleted file mode 100644
index 5581e79..0000000
--- a/src/Logger/Api.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-namespace Nixilla\Api\LoggerBundle\Logger;
-
-/**
- * @deprecated use ApiInterface instead
- */
-interface Api extends ApiInterface
-{
-}
\ No newline at end of file