--- a/Gemfile	Tue Oct 22 16:17:30 2019 +0900
+++ b/Gemfile	Sun Feb 23 20:23:09 2020 +0900
@@ -1,14 +1,8 @@
 source "https://rubygems.org"
 
 gem "rails", "~> 6.0.0"
-gem "jquery-rails"
-gem "coffee-rails"
-gem "bootstrap-sass"
-
-source "https://rails-assets.org" do
-  gem "rails-assets-highlightjs"
-  gem "rails-assets-commonmark"
-end
+gem "sass-rails"
+gem "webpacker"
 
 # Bundle edge Rails instead:
 # gem "rails", :git => "git://github.com/rails/rails.git"
@@ -17,10 +11,6 @@
 gem "activerecord-jdbcpostgresql-adapter", :platforms => :jruby
 gem "jruby-openssl", :platforms => :jruby
 
-gem "sass-rails"
-
-gem "uglifier"
-
 gem "therubyrhino", :platforms => :jruby
 
 # To use ActiveModel has_secure_password