diff --git a/.gitignore b/.gitignore
index 3938932..6724e2d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ index.php
 composer.lock
 /.idea
 .php_cs.cache
+.DS_Store
diff --git a/composer.json b/composer.json
index b94df2c..d9bea41 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,8 @@
     ],
     "require": {
         "guzzlehttp/guzzle": "~6.0|~7.0",
-        "illuminate/collections": "^8.0|^9.0|^10.0"
+        "illuminate/collections": "^8.0|^9.0|^10.0",
+        "ext-json": "*"
     },
     "autoload": {
         "psr-4": {
@@ -19,6 +20,6 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.0"
+        "phpunit/phpunit": "^6.0|^7.0|^8.0"
     }
 }
diff --git a/src/Dropbox/Dropbox.php b/src/Dropbox/Dropbox.php
index d59c276..6b6af05 100644
--- a/src/Dropbox/Dropbox.php
+++ b/src/Dropbox/Dropbox.php
@@ -105,7 +105,8 @@ public function __construct(DropboxApp $app, array $config = [])
         $config = array_merge([
             'http_client_handler' => null,
             'random_string_generator' => null,
-            'persistent_data_store' => null
+            'persistent_data_store' => null,
+            'namespace_id' => null
         ], $config);
 
         //Set the app
@@ -117,6 +118,9 @@ public function __construct(DropboxApp $app, array $config = [])
         //Make the HTTP Client
         $httpClient = DropboxHttpClientFactory::make($config['http_client_handler']);
 
+        //Set the namespace id for the global header Dropbox-API-Path-Root
+        $httpClient->setNamespace($config['namespace_id']);
+
         //Make and Set the DropboxClient
         $this->client = new DropboxClient($httpClient);
 
diff --git a/src/Dropbox/Http/Clients/DropboxGuzzleHttpClient.php b/src/Dropbox/Http/Clients/DropboxGuzzleHttpClient.php
index de1200d..f3fc0b3 100644
--- a/src/Dropbox/Http/Clients/DropboxGuzzleHttpClient.php
+++ b/src/Dropbox/Http/Clients/DropboxGuzzleHttpClient.php
@@ -23,6 +23,11 @@ class DropboxGuzzleHttpClient implements DropboxHttpClientInterface
      */
     protected $client;
 
+    /**
+     * @var string|null
+     */
+    protected $namespaceId = null;
+
     /**
      * Create a new DropboxGuzzleHttpClient instance.
      *
@@ -34,6 +39,14 @@ public function __construct(Client $client = null)
         $this->client = $client ?: new Client();
     }
 
+    /**
+     * @param int $namespaceId The namespace id
+     */
+    public function setNamespace( $namespaceId ){
+        $this->namespaceId = $namespaceId;
+    }
+
+
     /**
      * Send request to the server and fetch the raw response.
      *
@@ -49,6 +62,19 @@ public function __construct(Client $client = null)
      */
     public function send($url, $method, $body, $headers = [], $options = [])
     {
+        //Create a global header for the namespace
+        if ($this->namespaceId) {
+            $headers = array_merge(
+                $headers,
+                [
+                    'Dropbox-API-Path-Root' => json_encode([
+                        '.tag' => 'namespace_id',
+                        'namespace_id' => $this->namespaceId,
+                    ]),
+                ]
+            );
+        }
+
         //Create a new Request Object
         $request = new Request($method, $url, $headers, $body);