diff --git a/composer.json b/composer.json
index 2fdc478..178cb2d 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
 
 	"require": {
 		"php": ">=5.3.2",
-		"phpunit/phpunit": "3.7.*",
+		"phpunit/phpunit": "4.*@stable",
 		"behat/behat": "2.5.*@stable",
 		"behat/mink": "1.6.*-dev",
 		"behat/mink-extension": "1.3.*-dev",