diff --git a/composer.json b/composer.json
index 0c3105f1e..dbc389d59 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
 		"mustangostang/spyc": "^0.6.2"
 	},
 	"require-dev": {
-		"phpunit/PHPUnit": "~3.7"
+		"phpunit/phpunit": "^3 || ^4 || ^5"
 	},
 	"extra": {
 		"branch-alias": {