diff --git a/composer.json b/composer.json
index 8e205f8..c9e56b7 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,8 @@
         "mockery/mockery": "0.9.*",
         "phpunit/phpunit": "~6.0",
         "filp/whoops": "~2.0",
-        "nunomaduro/collision": "~1.1"
+        "nunomaduro/collision": "~1.1",
+        "symfony/thanks": "^1.0"
     },
     "autoload": {
         "classmap": [