diff --git a/composer.json b/composer.json
index 068ac60..b44d45f 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,8 @@
         "ext-simplexml": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": ">=3.7"
+        "phpunit/phpunit": "^4.7",
+        "satooshi/php-coveralls": "^0.6.1"
     },
     "autoload": {
         "psr-4": {