diff --git a/.rubocop.yml b/.rubocop.yml
index 14e7290..ed2cd14 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,6 @@
 ---
 require:
+  - rubocop-performance
   - rubocop-rake
   - rubocop-rspec
 
diff --git a/Gemfile b/Gemfile
index 83b7d65..471ff97 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,6 +11,7 @@ gem "pry"
 gem "rake"
 gem "rspec-rails"
 gem "rubocop"
+gem "rubocop-performance"
 gem "rubocop-rake"
 gem "rubocop-rspec"
 gem "simplecov"