diff --git a/composer.json b/composer.json
index 48a3b58..0a81794 100644
--- a/composer.json
+++ b/composer.json
@@ -21,6 +21,9 @@
         "sndsgd/util": "~1.0.3",
         "sndsgd/error": ">=0.0.3"
     },
+    "require-dev": {
+        "satooshi/php-coveralls": "~1.0"
+    },
     "autoload": {
         "psr-4": {
             "sndsgd\\": "src"