diff --git a/Gemfile b/Gemfile
index 3fa4bce..e37a38f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,7 @@ group :development, :test do
   gem 'puppet-lint',            :require => false
   gem 'puppet_facts',           :require => false
   gem 'json',                   :require => false
+  gem 'metadata-json-lint',     :require => false
 end
 
 group :system_tests do