diff --git a/Rakefile b/Rakefile
index 82bb534..c6435b8 100644
--- a/Rakefile
+++ b/Rakefile
@@ -2,7 +2,9 @@
 
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
+require 'rubocop/rake_task'
 
 RSpec::Core::RakeTask.new(:spec)
+RuboCop::RakeTask.new(:rubocop)
 
 task default: :spec
diff --git a/spec/dummy/config/environments/production.rb b/spec/dummy/config/environments/production.rb
index 32841c1..0b4bc9c 100644
--- a/spec/dummy/config/environments/production.rb
+++ b/spec/dummy/config/environments/production.rb
@@ -62,7 +62,7 @@
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
 
   if ENV['RAILS_LOG_TO_STDOUT'].present?
-    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger           = ActiveSupport::Logger.new($stdout)
     logger.formatter = config.log_formatter
     config.logger    = ActiveSupport::TaggedLogging.new(logger)
   end
diff --git a/spec/dummy/config/puma.rb b/spec/dummy/config/puma.rb
index 6d84069..69e2645 100644
--- a/spec/dummy/config/puma.rb
+++ b/spec/dummy/config/puma.rb
@@ -6,20 +6,20 @@
 # the maximum value specified for Puma. Default is set to 5 threads for minimum
 # and maximum; this matches the default thread size of Active Record.
 #
-max_threads_count = ENV.fetch('RAILS_MAX_THREADS') { 5 }
+max_threads_count = ENV.fetch('RAILS_MAX_THREADS', 5)
 min_threads_count = ENV.fetch('RAILS_MIN_THREADS') { max_threads_count }
 threads min_threads_count, max_threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
 #
-port        ENV.fetch('PORT') { 3000 }
+port        ENV.fetch('PORT', 3000)
 
 # Specifies the `environment` that Puma will run in.
 #
-environment ENV.fetch('RAILS_ENV') { 'development' }
+environment ENV.fetch('RAILS_ENV', 'development')
 
 # Specifies the `pidfile` that Puma will use.
-pidfile ENV.fetch('PIDFILE') { 'tmp/pids/server.pid' }
+pidfile ENV.fetch('PIDFILE', 'tmp/pids/server.pid')
 
 # Specifies the number of `workers` to boot in clustered mode.
 # Workers are forked web server processes. If using threads and workers together
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7d11c4f..11466a8 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -8,7 +8,7 @@
 require './app/controllers/healthcheck/healthchecks_controller'
 
 require File.expand_path('../spec/dummy/config/environment.rb', __dir__)
-ENV['RAILS_ROOT'] ||= File.dirname(__FILE__) + '../../../spec/dummy'
+ENV['RAILS_ROOT'] ||= "#{File.dirname(__FILE__)}../../../spec/dummy"
 
 require 'rspec/rails'
 require 'timecop'