diff --git a/Gemfile b/Gemfile
index 6476398..d106303 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,4 +9,5 @@ group :test do
   gem 'rspec'
   gem 'rubocop'
   gem 'coveralls', require: false
+  gem 'simplecov', require: false
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index e031310..0e7c878 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -100,3 +100,4 @@ DEPENDENCIES
   rake
   rspec
   rubocop
+  simplecov