diff --git a/composer.json b/composer.json
index 9ba27bb3..35abb04b 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,6 @@
 		}
 	},
 	"require-dev": {
-		"phpunit/PHPUnit": "~3.7"
+		"phpunit/PHPUnit": "~4.8"
 	}
 }