diff --git a/composer.json b/composer.json
index 32cb3991..cabc1614 100644
--- a/composer.json
+++ b/composer.json
@@ -12,6 +12,9 @@
     "require": {
         "php": ">=5.3.3"
     },
+    "require-dev": {
+        "phpunit/phpunit": "4.0.*"
+    },    
     "autoload": {
         "psr-0": {
             "Faker": "src/",