diff --git a/composer.json b/composer.json
index 52ccac3..399d258 100644
--- a/composer.json
+++ b/composer.json
@@ -18,6 +18,7 @@
 
     "require": {
         "php": ">=5.3.2",
+        "phpunit/phpunit": "3.7.x-dev",
         "behat/behat": "2.4.*@stable",
         "behat/mink": "1.4@stable",
         "behat/mink-extension": "1.0@stable",