diff --git a/lib/tdiary/rack/assets/precompile.rb b/lib/tdiary/rack/assets/precompile.rb
deleted file mode 100644
index 174d82e14..000000000
--- a/lib/tdiary/rack/assets/precompile.rb
+++ /dev/null
@@ -1,37 +0,0 @@
-# -*- coding: utf-8 -*-
-require 'coffee-script'
-require 'fileutils'
-
-module TDiary
-	module Rack
-		module Assets
-			class Precompile
-				def initialize(app, environment = nil)
-					@app = app
-					@environment = environment
-				end
-
-				def call( env )
-					@environment.each_file do |script|
-						next unless script.to_s =~ /\.coffee\z/
-						js_path = Pathname.new(script.to_s.gsub(/\.coffee\z/, '.js'))
-
-						if !FileTest.exist?(js_path) || FileUtils.uptodate?(script, [js_path])
-							File.open(js_path, 'w') do |js|
-								js.write CoffeeScript.compile(File.read(script))
-							end
-						end
-					end if @environment
-					@app.call( env )
-				end
-			end
-		end
-	end
-end
-
-# Local Variables:
-# mode: ruby
-# indent-tabs-mode: t
-# tab-width: 3
-# ruby-indent-level: 3
-# End:
diff --git a/lib/tdiary/tasks/assets.rake b/lib/tdiary/tasks/assets.rake
index 005487dfb..4a1598197 100644
--- a/lib/tdiary/tasks/assets.rake
+++ b/lib/tdiary/tasks/assets.rake
@@ -1,15 +1,4 @@
 namespace :assets do
-	if defined? CoffeeScript
-		desc "compile coffeescript"
-		task :compile do
-			FileList['js/**/*.coffee'].each do |coffee|
-				File.open(coffee.sub(/\.coffee\z/, '.js'), 'w') do |js|
-					js.write CoffeeScript.compile(File.read(coffee))
-				end
-			end
-		end
-	end
-
 	desc "copy assets files"
 	task :copy do
 		require 'fileutils'
diff --git a/spec/core/rack/assets/precompile_spec.rb b/spec/core/rack/assets/precompile_spec.rb
deleted file mode 100644
index dcc420b5f..000000000
--- a/spec/core/rack/assets/precompile_spec.rb
+++ /dev/null
@@ -1,75 +0,0 @@
-# -*- coding: utf-8 -*-
-require 'spec_helper'
-require 'rack/test'
-require 'fileutils'
-require 'sprockets'
-require 'tdiary/rack/assets/precompile'
-
-describe TDiary::Rack::Assets::Precompile do
-	include Rack::Test::Methods
-
-	let(:app) do
-		TDiary::Rack::Assets::Precompile.new(lambda{|env| [200, {}, ['Awesome']]}, @environment)
-	end
-	let(:assets_path) {"#{TDiary::PATH}/tmp/assets"}
-
-	before do
-		FileUtils.mkdir_p assets_path
-		@environment = Sprockets::Environment.new
-		@environment.append_path assets_path
-	end
-
-	after do
-		FileUtils.rm_rf assets_path
-	end
-
-	context "JavaScript が無い場合" do
-		before do
-			FileUtils.touch "#{assets_path}/foo.coffee"
-			get '/'
-		end
-
-		it "JavaScript にコンパイルされる" do
-			expect(FileTest.exist?("#{assets_path}/foo.js")).to be_truthy
-		end
-	end
-
-	context "JavaScript がある場合" do
-		context "CoffeeScript の方が新しい場合" do
-			before do
-				FileUtils.touch "#{assets_path}/foo.js"
-				sleep 1
-				FileUtils.touch "#{assets_path}/foo.coffee"
-				@jstime = File.mtime("#{assets_path}/foo.js").to_i
-
-				get '/'
-			end
-
-			it "JavaScript が更新される" do
-				expect(@jstime).to be < File.mtime("#{assets_path}/foo.js").to_i
-			end
-		end
-
-		context "JavaScript の方が新しい場合" do
-			before do
-				FileUtils.touch "#{assets_path}/foo.coffee"
-				sleep 1
-				FileUtils.touch "#{assets_path}/foo.js"
-				@jstime = File.mtime("#{assets_path}/foo.js").to_i
-
-				get '/'
-			end
-
-			it "JavaScript は更新されない" do
-				expect(@jstime).to eq(File.mtime("#{assets_path}/foo.js").to_i)
-			end
-		end
-	end
-end
-
-# Local Variables:
-# mode: ruby
-# indent-tabs-mode: t
-# tab-width: 3
-# ruby-indent-level: 3
-# End: