diff --git a/composer.json b/composer.json
index d89c66e..65c0dbe 100644
--- a/composer.json
+++ b/composer.json
@@ -29,6 +29,7 @@
         "php": ">=5.4.2"
       , "ratchet/rfc6455": "^0.3"
       , "react/socket": "^1.0 || ^0.8 || ^0.7 || ^0.6 || ^0.5"
+      , "react/event-loop": ">=0.4"
       , "guzzlehttp/psr7": "^1.0"
       , "symfony/http-foundation": "^2.6|^3.0|^4.0|^5.0"
       , "symfony/routing": "^2.6|^3.0|^4.0|^5.0"
diff --git a/tests/unit/Server/IoServerTest.php b/tests/unit/Server/IoServerTest.php
index b2f210d..0decfcb 100644
--- a/tests/unit/Server/IoServerTest.php
+++ b/tests/unit/Server/IoServerTest.php
@@ -18,7 +18,7 @@ class IoServerTest extends \PHPUnit_Framework_TestCase {
     protected $reactor;
 
     protected function tickLoop(LoopInterface $loop) {
-        $loop->addTimer(0, function() use ($loop) {
+        $loop->futureTIck(function () use ($loop) {
             $loop->stop();
         });