diff --git a/composer.json b/composer.json
index bf92771..d8d76e5 100644
--- a/composer.json
+++ b/composer.json
@@ -11,5 +11,8 @@
     },
     "autoload": {
         "psr-0": {"phpDocumentor": ["src/"]}
+    },
+    "require-dev": {
+        "phpunit/phpunit": "*@stable"
     }
-}
\ No newline at end of file
+}