diff --git a/composer.json b/composer.json
index 7478d18e..ff1e0531 100644
--- a/composer.json
+++ b/composer.json
@@ -22,10 +22,14 @@
 		"PHP" : ">=5.3"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~4.8.21"
+		"jakub-onderka/php-parallel-lint": "0.9.2",
+		"phpunit/phpunit": "~4.8.24"
 	},
 	"scripts": {
-		"test": "phpunit"
+		"test": [
+			"parallel-lint . --exclude vendor",
+			"phpunit"
+		]
 	},
 	"autoload": {
 		"psr-0": { "Less": "lib/" },