diff --git a/Gemfile b/Gemfile
index be2518b..6ac327a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,6 +13,7 @@ group :development do
   gem 'rb-fsevent', '~> 0.9'
   gem 'stringex', '~> 1.4.0'
   gem 'liquid', '~> 2.3.0'
+  gem 'iconv', '~> 1.0.4'
 end
 
 gem 'sinatra', '~> 1.3.2'