diff --git a/Gemfile b/Gemfile
index 0e9c0c5..60bc1a8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,12 +1,13 @@
 # frozen_string_literal: true
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
 # Specify your gem's dependencies in skyfall.gemspec
 gemspec
 
-gem "rake", "~> 13.0"
-gem "rspec", "~> 3.0"
+gem 'rake', '~> 13.0'
+gem 'rspec', '~> 3.0'
+gem 'irb'
 
 gem 'rdoc'
 gem 'yard'