diff --git a/composer.json b/composer.json
index ce759ad6..7ba59288 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,8 @@
     },
     "require-dev": {
         "guzzlehttp/guzzle": "5.x",
-        "sstalle/php7cc": "^1.0"
+        "sstalle/php7cc": "^1.0",
+        "phpunit/phpunit": "*"
     },
     "suggest": {
         "guzzlehttp/guzzle@5.x": "To use Guzzle5 request resolver"