diff --git a/Gemfile b/Gemfile
index 02af110..f6356d5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,7 +25,7 @@ group :development do
   gem 'rack-test'
   gem 'rake'
   gem 'rspec'
-  gem 'simplecov'
+  gem 'simplecov', require: false
   gem 'timecop'
-  gem 'yard'
+  gem 'yard', require: false
 end
diff --git a/Rakefile b/Rakefile
index aae19e2..3141ed4 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,8 +7,4 @@ require 'bundler/setup'
 require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new
 
-# YARD
-require 'yard'
-YARD::Rake::YardocTask.new
-
-task default: [:spec, :yard]
+task default: :spec