diff --git a/composer.json b/composer.json
index a40d085..50089d9 100644
--- a/composer.json
+++ b/composer.json
@@ -3,6 +3,8 @@
     "description": "Package to communicate with RESTful API's in an agnostic way. Usues php magic __call function.",
     "type": "library",
     "require": {
+        "php" : "^5.3 || ^7.0",
+        "ext-json": "*",
         "guzzlehttp/guzzle": "^6.3"
     },
     "authors": [
diff --git a/src/apicore/structure/apicore.php b/src/apicore/structure/apicore.php
index 761211e..eba9d26 100644
--- a/src/apicore/structure/apicore.php
+++ b/src/apicore/structure/apicore.php
@@ -22,10 +22,10 @@ abstract class apiCore implements coreInterface{
     private $httpMethod = 'GET';
     private $bodyFormat = 'body';
     private $lastResult;
-    private $args = [];
+    private $args = array();
     private $rawResponse = FALSE;
     private $processedResponse = FALSE;
-    private $errors = [];
+    private $errors = array();
 
     /**
      * apiCore constructor.
@@ -124,7 +124,7 @@ public function auth($key, $value, $type = 'basic')
                 break;
             case 'basic':
             default:
-                $this->args['auth'] = [$key, $value];
+                $this->args['auth'] = array($key, $value);
             break;
         }
     }
@@ -174,7 +174,7 @@ public function __get($name)
     public function __call($name, $arguments)
     {
         $client = new GuzzleHttp\Client();
-        $query = count($arguments) < 1 || !is_array($arguments[0]) ? [] : $arguments[0];
+        $query = count($arguments) < 1 || !is_array($arguments[0]) ? array() : $arguments[0];
         $this->request->addEndpoint($name);
         $this->processArgs($query);
         try {
@@ -240,11 +240,11 @@ public function resetPath(){
      */
     private function setDefaultCurlOpts(){
         $this->args['config'] =
-            [
-                'curl' => [
+            array(
+                'curl' => array(
                     CURLOPT_SSLVERSION => 6,
-                ]
-            ];
+                )
+            );
     }
 
     /**
diff --git a/src/apicore/structure/request.php b/src/apicore/structure/request.php
index 7ba1ae7..5626e93 100644
--- a/src/apicore/structure/request.php
+++ b/src/apicore/structure/request.php
@@ -12,7 +12,7 @@ class request {
     private $useVersion;
     private $queryString = '';
     private $endpoint;
-    private $path = [];
+    private $path = array();
 
     public function __construct()
     {
@@ -69,7 +69,7 @@ public function setVersion($version, $flag){
      * @return $this
      */
     public function addPathElement($path, $reset = FALSE){
-        $elements = [];
+        $elements = array();
         $path = ltrim($path, '/');
         if(strpos($path, '/') !== FALSE){
             $elements = explode('/', $path);
@@ -92,7 +92,7 @@ public function addPathElement($path, $reset = FALSE){
      * Function to reset the path part of the request. Allows a request object to be reused.
      */
     public function resetPath(){
-        $this->path = [];
+        $this->path = array();
         return $this;
     }