diff --git a/.rubocop.yml b/.rubocop.yml
index 31706438..df90eb0b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,6 @@
 require:
   - rubocop-rspec
+  - rubocop-performance
 
 AllCops:
   DisabledByDefault: false
diff --git a/capybara.gemspec b/capybara.gemspec
index 10886035..0690d976 100644
--- a/capybara.gemspec
+++ b/capybara.gemspec
@@ -44,6 +44,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rake')
   s.add_development_dependency('rspec', ['>= 3.5.0'])
   s.add_development_dependency('rubocop')
+  s.add_development_dependency('rubocop-performance')
   s.add_development_dependency('rubocop-rspec')
   s.add_development_dependency('selenium-webdriver', ['~>3.5'])
   s.add_development_dependency('selenium_statistics')