diff --git a/composer.json b/composer.json
index 80a3aa5..6ce02b3 100644
--- a/composer.json
+++ b/composer.json
@@ -29,4 +29,7 @@
       , "symfony/http-foundation": "^2.2|^3.0"
       , "symfony/routing": "^2.2|^3.0"
     }
+  , "require-dev": {
+        "phpunit/phpunit": "~4.8"
+    }
 }