diff --git a/Gemfile b/Gemfile
index b933a0d..9019667 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 source 'https://rubygems.org'
-
+gem 'erb'
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 # Synchronize with https://pages.github.com/versions