diff --git a/Gemfile b/Gemfile
index 5231162..09700ba 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 gem 'thor'
 gem 'rly'
 gem 'pry'
-
+gem 'opal'
 
 # Specify your gem's dependencies in mm2ep_depend.gemspec
 gemspec