diff --git a/lib/zeus/parallel_tests/version.rb b/lib/zeus/parallel_tests/version.rb
index 51b01f1..f7d7d2a 100644
--- a/lib/zeus/parallel_tests/version.rb
+++ b/lib/zeus/parallel_tests/version.rb
@@ -1,5 +1,5 @@
 module Zeus
   module ParallelTests
-    VERSION = '0.3.1'
+    VERSION = '0.3.1'.freeze
   end
 end
diff --git a/spec/dummy/Guardfile b/spec/dummy/Guardfile
index 629e478..22a2876 100644
--- a/spec/dummy/Guardfile
+++ b/spec/dummy/Guardfile
@@ -19,5 +19,5 @@ guard 'rspec', zeus: true, parallel: true do
 
   # Turnip features and steps
   watch(%r{^spec/acceptance/(.+)\.feature$})
-  watch(%r{^spec/acceptance/steps/(.+)_steps\.rb$})   { |m| Dir[File.join("**/#{m[1]}.feature")][0] || 'spec/acceptance' }
+  watch(%r{^spec/acceptance/steps/(.+)_steps\.rb$}) { |m| Dir[File.join("**/#{m[1]}.feature")][0] || 'spec/acceptance' }
 end
diff --git a/spec/dummy/config.ru b/spec/dummy/config.ru
index 1989ed8..cbd7415 100644
--- a/spec/dummy/config.ru
+++ b/spec/dummy/config.ru
@@ -1,4 +1,4 @@
 # This file is used by Rack-based servers to start the application.
 
-require ::File.expand_path('../config/environment',  __FILE__)
+require ::File.expand_path('../config/environment', __FILE__)
 run Dummy::Application
diff --git a/spec/dummy/config/environments/test.rb b/spec/dummy/config/environments/test.rb
index f7d264b..904d888 100644
--- a/spec/dummy/config/environments/test.rb
+++ b/spec/dummy/config/environments/test.rb
@@ -22,7 +22,7 @@
   config.action_dispatch.show_exceptions = false
 
   # Disable request forgery protection in test environment
-  config.action_controller.allow_forgery_protection    = false
+  config.action_controller.allow_forgery_protection = false
 
   # Tell Action Mailer not to deliver emails to the real world.
   # The :test delivery method accumulates sent emails in the
diff --git a/spec/dummy/script/rails b/spec/dummy/script/rails
index f8da2cf..bd79dce 100755
--- a/spec/dummy/script/rails
+++ b/spec/dummy/script/rails
@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 # This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.
 
-APP_PATH = File.expand_path('../../config/application',  __FILE__)
-require File.expand_path('../../config/boot',  __FILE__)
+APP_PATH = File.expand_path('../../config/application', __FILE__)
+require File.expand_path('../../config/boot', __FILE__)
 require 'rails/commands'
diff --git a/spec/lib/zeus/parallel_tests/worker_spec.rb b/spec/lib/zeus/parallel_tests/worker_spec.rb
index 358e3fb..4c6d2f6 100644
--- a/spec/lib/zeus/parallel_tests/worker_spec.rb
+++ b/spec/lib/zeus/parallel_tests/worker_spec.rb
@@ -6,7 +6,7 @@
     let(:cli_env)  { { 'TEST_ENV_NUMBER' => '3' } }
     let(:worker)   { double('worker', spawn: 0) }
     before  { allow(Zeus::ParallelTests::Worker).to receive_messages(new: worker) }
-    subject { Zeus::ParallelTests::Worker.run(cli_argv, cli_env)  }
+    subject { Zeus::ParallelTests::Worker.run(cli_argv, cli_env) }
 
     it 'creates instance of worker' do
       expect(Zeus::ParallelTests::Worker).to receive(:new)