diff --git a/HISTORY.md b/HISTORY.md
index c5e158c..7aabd72 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,7 @@
+## 3.1.2
+  * カバレッジレポートの出力から rcov 形式を削除
+    * simplecov-rcov は（他の箇所で使っていなければ）不使用になるので、Gemfile から削除してください
+
 ## 3.1.1
   * ジョブ監査ログに開始時刻と終了時刻を追加
 
diff --git a/bizside_test_app/.gitignore b/bizside_test_app/.gitignore
index eb7a677..f0403b4 100644
--- a/bizside_test_app/.gitignore
+++ b/bizside_test_app/.gitignore
@@ -14,4 +14,7 @@
 /log/*.log
 /tmp
 
+# test coverage output dir
+/coverage
+
 /Gemfile.lock
diff --git a/bizside_test_app/Gemfile b/bizside_test_app/Gemfile
index 49781f8..b9f6c64 100644
--- a/bizside_test_app/Gemfile
+++ b/bizside_test_app/Gemfile
@@ -48,8 +48,7 @@ group :test do
   gem 'puma'
   gem 'rails-controller-testing'
   gem 'RedCloth'
-  gem 'simplecov'
-  gem 'simplecov-rcov'
+  gem 'simplecov', require: false
   gem 'webmock'
 end
 
diff --git a/bizside_test_app/test/test_helper.rb b/bizside_test_app/test/test_helper.rb
index 7b4aa93..293d7cc 100644
--- a/bizside_test_app/test/test_helper.rb
+++ b/bizside_test_app/test/test_helper.rb
@@ -1,3 +1,5 @@
+require 'bizside/test_help'
+
 ENV['RAILS_ENV'] ||= 'test'
 require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'
diff --git a/lib/bizside/coverage/launch.rb b/lib/bizside/coverage/launch.rb
index 0df21a1..cc3bdb7 100644
--- a/lib/bizside/coverage/launch.rb
+++ b/lib/bizside/coverage/launch.rb
@@ -4,7 +4,7 @@ class Launch
 
       def self.load
         if ENV["COVERAGE"].to_s.downcase == 'true' and ENV['ACCEPTANCE_TEST'].to_s.downcase == 'true'
-          setup()
+          require 'simplecov'
 
           SimpleCov.start 'rails' do
             SimpleCov.command_name(ENV['COMMAND_NAME']) if ENV['COMMAND_NAME']
@@ -15,21 +15,10 @@ def self.load
 
       def self.load_from_test_helper
         if ENV["COVERAGE"] == 'true'
-          setup()
+          require 'simplecov'
           SimpleCov.start 'rails'
         end
       end
-
-      def self.setup
-        require 'simplecov'
-        require 'simplecov-rcov'
-        require_relative 'rcov_formatter'
-        SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new([
-          SimpleCov::Formatter::HTMLFormatter,
-          Bizside::Coverage::RcovFormatter
-        ])
-      end
-      private_class_method :setup
     end
   end
 end
diff --git a/lib/bizside/coverage/rcov_formatter.rb b/lib/bizside/coverage/rcov_formatter.rb
deleted file mode 100755
index 6d9e5f7..0000000
--- a/lib/bizside/coverage/rcov_formatter.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-module Bizside
-  module Coverage
-    class RcovFormatter < SimpleCov::Formatter::RcovFormatter
-
-      private
-
-      def write_file(template, output_filename, binding)
-        rcov_result = template.result( binding ).force_encoding('UTF-8')
-        File.open( output_filename, "w" ) do |file_result|
-          file_result.write rcov_result
-        end
-      end
-    end
-  end
-end
diff --git a/lib/bizside/version.rb b/lib/bizside/version.rb
index 005ed0b..3a8b6de 100644
--- a/lib/bizside/version.rb
+++ b/lib/bizside/version.rb
@@ -1,3 +1,3 @@
 module Bizside
-  VERSION = '3.1.1'
+  VERSION = '3.1.2'
 end