diff --git a/composer.json b/composer.json
index 51b2718..d98d85b 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,9 @@
 		"silverstripe/framework": "self.version",
 		"silverstripe-themes/simple": "*"
 	},
+	"require-dev": {
+		"phpunit/PHPUnit": "~3.7@stable"
+	},
 	"extra": {
 		"branch-alias": {
 			"3.x-dev": "3.2.x-dev"