diff --git a/composer.json b/composer.json
index 0939dd49..a5cc28d1 100644
--- a/composer.json
+++ b/composer.json
@@ -18,14 +18,14 @@
     },
     "require-dev": {
         "phpunit/phpunit": "~3.7.0",
-        "mlehner/gelf-php": "1.0.*",
+        "graylog2/gelf-php": "~1.0",
         "raven/raven": "0.5.*",
         "ruflin/elastica": "0.90.*",
         "doctrine/couchdb": "dev-master",
         "aws/aws-sdk-php": "~2.4.8"
     },
     "suggest": {
-        "mlehner/gelf-php": "Allow sending log messages to a GrayLog2 server",
+        "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
         "raven/raven": "Allow sending log messages to a Sentry server",
         "doctrine/couchdb": "Allow sending log messages to a CouchDB server",
         "ruflin/elastica": "Allow sending log messages to an Elastic Search server",
diff --git a/src/Monolog/Handler/GelfHandler.php b/src/Monolog/Handler/GelfHandler.php
index 34d48e75..6de44dee 100644
--- a/src/Monolog/Handler/GelfHandler.php
+++ b/src/Monolog/Handler/GelfHandler.php
@@ -11,29 +11,29 @@
 
 namespace Monolog\Handler;
 
-use Gelf\IMessagePublisher;
+use Gelf\Publisher;
 use Monolog\Logger;
-use Monolog\Handler\AbstractProcessingHandler;
 use Monolog\Formatter\GelfMessageFormatter;
 
 /**
  * Handler to send messages to a Graylog2 (http://www.graylog2.org) server
  *
  * @author Matt Lehner <mlehner@gmail.com>
+ * @author Benjamin Zikarsky <benjamin@zikarsky.de>
  */
 class GelfHandler extends AbstractProcessingHandler
 {
     /**
-     * @var Gelf\IMessagePublisher the publisher object that sends the message to the server
+     * @var Publisher the publisher object that sends the message to the server
      */
     protected $publisher;
 
     /**
-     * @param Gelf\IMessagePublisher $publisher a publisher object
-     * @param integer                $level     The minimum logging level at which this handler will be triggered
-     * @param Boolean                $bubble    Whether the messages that are handled can bubble up the stack or not
+     * @param Publisher  $publisher a publisher object
+     * @param integer    $level     The minimum logging level at which this handler will be triggered
+     * @param boolean    $bubble    Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct(IMessagePublisher $publisher, $level = Logger::DEBUG, $bubble = true)
+    public function __construct(Publisher $publisher, $level = Logger::DEBUG, $bubble = true)
     {
         parent::__construct($level, $bubble);
 
diff --git a/tests/Monolog/Formatter/GelfMessageFormatterTest.php b/tests/Monolog/Formatter/GelfMessageFormatterTest.php
index d8867d9f..12393676 100644
--- a/tests/Monolog/Formatter/GelfMessageFormatterTest.php
+++ b/tests/Monolog/Formatter/GelfMessageFormatterTest.php
@@ -18,8 +18,8 @@ class GelfMessageFormatterTest extends \PHPUnit_Framework_TestCase
 {
     public function setUp()
     {
-        if (!class_exists("Gelf\Message")) {
-            $this->markTestSkipped("mlehner/gelf-php not installed");
+        if (!class_exists('\Gelf\Message')) {
+            $this->markTestSkipped("graylog2/gelf-php not installed");
         }
     }
 
@@ -47,7 +47,7 @@ class GelfMessageFormatterTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('meh', $message->getFacility());
         $this->assertEquals(null, $message->getLine());
         $this->assertEquals(null, $message->getFile());
-        $this->assertEquals(3, $message->getLevel());
+        $this->assertEquals(3, $message->getSyslogLevel());
         $this->assertNotEmpty($message->getHost());
 
         $formatter = new GelfMessageFormatter('mysystem');
diff --git a/tests/Monolog/Handler/GelfHandlerTest.php b/tests/Monolog/Handler/GelfHandlerTest.php
index 8e9b9f8a..a14a1a9d 100644
--- a/tests/Monolog/Handler/GelfHandlerTest.php
+++ b/tests/Monolog/Handler/GelfHandlerTest.php
@@ -11,6 +11,7 @@
 
 namespace Monolog\Handler;
 
+use Gelf\Message;
 use Monolog\TestCase;
 use Monolog\Logger;
 use Monolog\Formatter\GelfMessageFormatter;
@@ -19,11 +20,9 @@ class GelfHandlerTest extends TestCase
 {
     public function setUp()
     {
-        if (!class_exists("Gelf\MessagePublisher") || !class_exists("Gelf\Message")) {
-            $this->markTestSkipped("mlehner/gelf-php not installed");
+        if (!class_exists('\Gelf\Publisher') || !class_exists('\Gelf\Message')) {
+            $this->markTestSkipped("graylog2/gelf-php not installed");
         }
-
-        require_once __DIR__ . '/GelfMocks.php';
     }
 
     /**
@@ -44,51 +43,79 @@ class GelfHandlerTest extends TestCase
 
     protected function getMessagePublisher()
     {
-        return new MockMessagePublisher('localhost');
+        return $this->getMock('\Gelf\Publisher', array('publish'), array(), '', false);
     }
 
     public function testDebug()
     {
+        $record = $this->getRecord(Logger::DEBUG, "A test debug message");
+        $expectedMessage = new Message();
+        $expectedMessage
+            ->setLevel(7)
+            ->setFacility("test")
+            ->setShortMessage($record['message'])
+            ->setTimestamp($record['datetime'])
+        ;
+
         $messagePublisher = $this->getMessagePublisher();
+        $messagePublisher->expects($this->once())
+            ->method('publish')
+            ->with($expectedMessage);
+
         $handler = $this->getHandler($messagePublisher);
 
-        $record = $this->getRecord(Logger::DEBUG, "A test debug message");
+
         $handler->handle($record);
 
-        $this->assertEquals(7, $messagePublisher->lastMessage->getLevel());
-        $this->assertEquals('test', $messagePublisher->lastMessage->getFacility());
-        $this->assertEquals($record['message'], $messagePublisher->lastMessage->getShortMessage());
-        $this->assertEquals(null, $messagePublisher->lastMessage->getFullMessage());
     }
 
     public function testWarning()
     {
+        $record = $this->getRecord(Logger::WARNING, "A test warning message");
+        $expectedMessage = new Message();
+        $expectedMessage
+            ->setLevel(4)
+            ->setFacility("test")
+            ->setShortMessage($record['message'])
+            ->setTimestamp($record['datetime'])
+        ;
+
         $messagePublisher = $this->getMessagePublisher();
+        $messagePublisher->expects($this->once())
+            ->method('publish')
+            ->with($expectedMessage);
+
         $handler = $this->getHandler($messagePublisher);
 
-        $record = $this->getRecord(Logger::WARNING, "A test warning message");
-        $handler->handle($record);
 
-        $this->assertEquals(4, $messagePublisher->lastMessage->getLevel());
-        $this->assertEquals('test', $messagePublisher->lastMessage->getFacility());
-        $this->assertEquals($record['message'], $messagePublisher->lastMessage->getShortMessage());
-        $this->assertEquals(null, $messagePublisher->lastMessage->getFullMessage());
+        $handler->handle($record);
     }
 
     public function testInjectedGelfMessageFormatter()
     {
-        $messagePublisher = $this->getMessagePublisher();
-        $handler = $this->getHandler($messagePublisher);
-
-        $handler->setFormatter(new GelfMessageFormatter('mysystem', 'EXT', 'CTX'));
-
         $record = $this->getRecord(Logger::WARNING, "A test warning message");
         $record['extra']['blarg'] = 'yep';
         $record['context']['from'] = 'logger';
+
+        $expectedMessage = new Message();
+        $expectedMessage
+            ->setLevel(4)
+            ->setFacility("test")
+            ->setHost("mysystem")
+            ->setShortMessage($record['message'])
+            ->setTimestamp($record['datetime'])
+            ->setAdditional("EXTblarg", 'yep')
+            ->setAdditional("CTXfrom", 'logger')
+        ;
+
+        $messagePublisher = $this->getMessagePublisher();
+        $messagePublisher->expects($this->once())
+            ->method('publish')
+            ->with($expectedMessage);
+
+        $handler = $this->getHandler($messagePublisher);
+        $handler->setFormatter(new GelfMessageFormatter('mysystem', 'EXT', 'CTX'));
         $handler->handle($record);
 
-        $this->assertEquals('mysystem', $messagePublisher->lastMessage->getHost());
-        $this->assertArrayHasKey('_EXTblarg', $messagePublisher->lastMessage->toArray());
-        $this->assertArrayHasKey('_CTXfrom', $messagePublisher->lastMessage->toArray());
     }
 }
diff --git a/tests/Monolog/Handler/GelfMocks.php b/tests/Monolog/Handler/GelfMocks.php
deleted file mode 100644
index dda87114..00000000
--- a/tests/Monolog/Handler/GelfMocks.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-/*
- * This file is part of the Monolog package.
- *
- * (c) Jordi Boggiano <j.boggiano@seld.be>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Monolog\Handler;
-
-use Gelf\MessagePublisher;
-use Gelf\Message;
-
-class MockMessagePublisher extends MessagePublisher
-{
-    public function publish(Message $message)
-    {
-        $this->lastMessage = $message;
-    }
-
-    public $lastMessage = null;
-}