diff --git a/composer.json b/composer.json
index 8a354163..ab847d15 100644
--- a/composer.json
+++ b/composer.json
@@ -16,6 +16,9 @@
         "ext-curl": "*",
         "guzzle/guzzle": ">=0.7"
     },
+    "require-dev": {
+        "phpunit/phpunit": ">=3.7"
+    },
     "autoload": {
         "psr-0": { "Tmdb\\": "lib/" }
     }