diff --git a/Gemfile b/Gemfile
index c1dbddd..87de329 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,3 +7,6 @@
 source 'https://rubygems.org'
 
 gem 'community_cookbook_releaser'
+
+# local development and testing requires this gem is installed.
+gem 'toml'