diff --git a/composer.json b/composer.json
index 250c02c..c8bee7d 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": ">=5.5.0",
-        "guzzlehttp/guzzle": "^6.0",
+        "guzzlehttp/guzzle": "^5.0|^6.0",
         "symfony/serializer": "^2.0|^3.0"
     },
     "require-dev": {
diff --git a/src/Josser/Client/Transport/Guzzle5Transport.php b/src/Josser/Client/Transport/Guzzle5Transport.php
new file mode 100644
index 0000000..840e28d
--- /dev/null
+++ b/src/Josser/Client/Transport/Guzzle5Transport.php
@@ -0,0 +1,69 @@
+<?php
+
+/*
+ * This file is part of the Josser package.
+ *
+ * (C) Alan Gabriel Bem <alan.bem@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Josser\Client\Transport;
+
+use GuzzleHttp\Client;
+use Josser\Exception\TransportFailureException;
+
+/**
+ * JSON-RPC http transport with Guzzle 5.
+ *
+ * @author Alan Gabriel Bem <alan.bem@gmail.com>
+ */
+class Guzzle5Transport implements TransportInterface
+{
+    /**
+     * Guzzle http client.
+     *
+     * @var Client
+     */
+    private $guzzle;
+
+    /**
+     * @param Client $guzzle
+     */
+    public function __construct(Client $guzzle)
+    {
+        $this->guzzle = $guzzle;
+    }
+
+    /**
+     * @return Client
+     */
+    public function getGuzzle()
+    {
+        return $this->guzzle;
+    }
+
+    /**
+     * Send data to remote JSON-RPC service over HTTP.
+     *
+     * @throws \Josser\Exception\TransportFailureException
+     * @param mixed $data
+     * @return string
+     */
+    public function send($data)
+    {
+        try {
+            $response = $this->guzzle->post(null, [
+                'body' => $data,
+                'headers' => [
+                    'Content-Type' => 'application/json',
+                ]
+            ]);
+            return $response->getBody()->getContents();
+        } catch (\Exception $e) {
+            $error = sprintf('JSON-RPC http connection failed. Remote service at "%s" is not responding.', $this->guzzle->getBaseUrl());
+            throw new TransportFailureException($error, null, $e);
+        }
+    }
+}
diff --git a/src/Josser/Client/Transport/HttpTransport.php b/src/Josser/Client/Transport/Guzzle6Transport.php
similarity index 94%
rename from src/Josser/Client/Transport/HttpTransport.php
rename to src/Josser/Client/Transport/Guzzle6Transport.php
index 5fe9802..887505d 100644
--- a/src/Josser/Client/Transport/HttpTransport.php
+++ b/src/Josser/Client/Transport/Guzzle6Transport.php
@@ -15,11 +15,11 @@
 use Josser\Exception\TransportFailureException;
 
 /**
- * JSON-RPC http transport.
+ * JSON-RPC http transport with Guzzle 6.
  *
  * @author Alan Gabriel Bem <alan.bem@gmail.com>
  */
-class HttpTransport implements TransportInterface
+class Guzzle6Transport implements TransportInterface
 {
     /**
      * Guzzle http client.
diff --git a/tests/Josser/Tests/Transport/HttpTransportTest.php b/tests/Josser/Tests/Transport/HttpTransportTest.php
deleted file mode 100644
index d66862b..0000000
--- a/tests/Josser/Tests/Transport/HttpTransportTest.php
+++ /dev/null
@@ -1,93 +0,0 @@
-<?php
-
-/*
- * This file is part of the Josser package.
- *
- * (C) Alan Gabriel Bem <alan.bem@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Josser\Tests\Transport;
-
-use GuzzleHttp\Client;
-use GuzzleHttp\Exception\RequestException;
-use GuzzleHttp\Handler\MockHandler;
-use GuzzleHttp\HandlerStack;
-use GuzzleHttp\Psr7\Request;
-use GuzzleHttp\Psr7\Response;
-use Josser\Tests\TestCase as JosserTestCase;
-use Josser\Client\Transport\HttpTransport;
-
-/**
- * Test class for Josser\Transport\HttpTransport.
- */
-class HttpTransportTest extends JosserTestCase
-{
-    /**
-     *
-     * Test getters of transport object.
-     */
-    public function testGetters()
-    {
-        $guzzle    = $this->getMock(Client::class);
-        $transport = new HttpTransport($guzzle);
-
-        $this->assertSame($guzzle, $transport->getGuzzle());
-    }
-
-    public function testSend()
-    {
-        $mock = new MockHandler([
-            new Response(200, [], '1'),
-        ]);
-
-        $handler = HandlerStack::create($mock);
-        $guzzle = new Client(['handler' => $handler]);
-
-        $transport = new HttpTransport($guzzle);
-
-        $result = $transport->send('[]');
-
-        $this->assertEquals('1', $result);
-    }
-
-    /**
-     * Test transport if there is no connection.
-     */
-    public function testNoConnection()
-    {
-        $mock = new MockHandler([
-            new RequestException("Error Communicating with Server", new Request('GET', 'test'))
-        ]);
-
-        $handler = HandlerStack::create($mock);
-        $guzzle = new Client(['handler' => $handler]);
-
-        $transport = new HttpTransport($guzzle);
-
-        $this->setExpectedException('Josser\Exception\TransportFailureException');
-
-        $transport->send('[]');
-    }
-
-    /**
-     * Fixtures
-     *
-     * @return array
-     */
-    public function connectionsProvider()
-    {
-        return array(
-            array('localhost', 'user', 'password', 8332, true,  'https://user:password@localhost:8332'),
-            array('localhost', 'user', 'password', 8332, false, 'http://user:password@localhost:8332'),
-            array('localhost', 'user', 'password', 9000, true,  'https://user:password@localhost:9000'),
-            array('localhost', 'user', 'password', 9000, false, 'http://user:password@localhost:9000'),
-            array('127.0.0.1', 'user', 'password', 8332, true,  'https://user:password@127.0.0.1:8332'),
-            array('127.0.0.1', 'user', 'password', 8332, false, 'http://user:password@127.0.0.1:8332'),
-            array('127.0.0.1', 'user', 'password', 9000, true,  'https://user:password@127.0.0.1:9000'),
-            array('127.0.0.1', 'user', 'password', 9000, false, 'http://user:password@127.0.0.1:9000'),
-        );
-    }
-}