diff --git a/composer.json b/composer.json
index dc289d1..7579e94 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "silverstripe/asset-admin": "~1.0.0"
 	},
 	"require-dev": {
-		"phpunit/PHPUnit": "~3.7@stable"
+		"phpunit/PHPUnit": "~4.8@stable"
 	},
 	"extra": {
 		"branch-alias": {