diff --git a/Gemfile b/Gemfile
index 55fd4eec..92cd636e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,3 +10,5 @@ gem 'wdm', '>= 0.1.1' if Gem.win_platform?
 gem "webrick", "~> 1.8"
 
 gem 'html-proofer', "~> 3.19.4"
+
+gem 'json'