diff --git a/.github/workflows/master_and_pr.yml b/.github/workflows/master_and_pr.yml
index d3e4b92..d792633 100644
--- a/.github/workflows/master_and_pr.yml
+++ b/.github/workflows/master_and_pr.yml
@@ -10,45 +10,21 @@ jobs:
     strategy:
       matrix:
         rails_version:
-          - "5.0"
-          - "5.1"
-          - "5.2"
-          - "6.0"
           - "6.1"
+          - "7.0"
+          - "7.1"
         ruby_version:
-          - "2.7"
           - "3.1"
-        autoloader:
-          - "zeitwerk"
-          - "classic"
+          - "3.2"
+          - "3.3"
         eager_load:
           - "true"
           - "false"
-        exclude:
-          - rails_version: "5.0"
-            ruby_version: "3.1"
-          - rails_version: "5.1"
-            ruby_version: "3.1"
-          - rails_version: "5.2"
-            ruby_version: "3.1"
-          - rails_version: "5.0"
-            autoloader: "zeitwerk"
-          - rails_version: "5.1"
-            autoloader: "zeitwerk"
-          - rails_version: "5.2"
-            autoloader: "zeitwerk"
-          - rails_version: "5.0"
-            autoloader: "classic"
-          - rails_version: "5.1"
-            autoloader: "classic"
-          - rails_version: "5.2"
-            autoloader: "classic"
-    name: Test on Rails ${{ matrix.rails_version }} & Ruby ${{ matrix.ruby_version }} & Autoloader ${{ matrix.autoloader }} & EagerLoad ${{ matrix.eager_load }}
+    name: Test on Rails ${{ matrix.rails_version }} & Ruby ${{ matrix.ruby_version }} & EagerLoad ${{ matrix.eager_load }}
     env:
       BUNDLE_GEMFILE: gemfiles/Gemfile_rails_${{ matrix.rails_version }}.rb
       CI: true
       EAGER_LOAD: ${{ matrix.eager_load }}
-      AUTOLOADER : ${{ matrix.autoloader }}
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
@@ -58,7 +34,7 @@ jobs:
       - name: rspec
         run: bundle exec rspec
       - name: Coveralls
-        if: matrix.rails_version == '6.1' && matrix.ruby_version == '3.1'
+        if: matrix.rails_version == '7.1' && matrix.ruby_version == '3.3'
         uses: coverallsapp/github-action@master
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80ef836..a835fb6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
 ## Unreleased
+* Support Rails 6,1. 7.0, 7.1.
+* Drop support for Raiils below 6.0
+* Drop support for Ruby 2
+* Drop support for classic loader
+* The functionality to extend the view_paths has been discontinued.
 
 ## 2.3.0
 * Support Rails 5.0, 5.1, 5,2, 6.0, 6,1.
diff --git a/chanko.gemspec b/chanko.gemspec
index b8b822b..260b6f7 100644
--- a/chanko.gemspec
+++ b/chanko.gemspec
@@ -14,9 +14,9 @@ Gem::Specification.new do |gem|
   gem.files         = `git ls-files`.split($/)
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
-  gem.required_ruby_version = '>= 2.6.0'
+  gem.required_ruby_version = '>= 3.0.0'
 
-  gem.add_dependency "rails", ">= 5.0.0"
+  gem.add_dependency "rails", ">= 6.1.0"
   gem.add_development_dependency "byebug"
   gem.add_development_dependency "coffee-rails", ">= 3.0.10"
   gem.add_development_dependency "jquery-rails"
@@ -27,7 +27,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "simplecov"
   gem.add_development_dependency 'simplecov-lcov'
   gem.add_development_dependency "slim"
-  gem.add_development_dependency "sqlite3"
+  gem.add_development_dependency "sqlite3", ">= 1.4"
   gem.add_development_dependency "thin"
   gem.add_development_dependency "uglifier"
 end
diff --git a/gemfiles/Gemfile_rails_5.0.rb b/gemfiles/Gemfile_rails_5.0.rb
deleted file mode 100644
index 4c8bb7e..0000000
--- a/gemfiles/Gemfile_rails_5.0.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: '..'
-
-gem 'rails', '~> 5.0.0'
-gem 'sqlite3', '~> 1.3.6'
diff --git a/gemfiles/Gemfile_rails_5.1.rb b/gemfiles/Gemfile_rails_5.1.rb
deleted file mode 100644
index 333f2eb..0000000
--- a/gemfiles/Gemfile_rails_5.1.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: '..'
-
-gem 'rails', '~> 5.1.0'
-gem 'sqlite3', '~> 1.3.6'
diff --git a/gemfiles/Gemfile_rails_5.2.rb b/gemfiles/Gemfile_rails_5.2.rb
deleted file mode 100644
index a1fe02e..0000000
--- a/gemfiles/Gemfile_rails_5.2.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: '..'
-
-gem 'rails', '~> 5.2.0'
-gem 'sqlite3', '~> 1.3.6'
diff --git a/gemfiles/Gemfile_rails_6.0.rb b/gemfiles/Gemfile_rails_6.0.rb
deleted file mode 100644
index 8da51e2..0000000
--- a/gemfiles/Gemfile_rails_6.0.rb
+++ /dev/null
@@ -1,8 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: '..'
-
-gem 'rails', '~> 6.0.0'
-gem 'net-smtp'
-gem 'net-pop'
-gem 'net-imap'
diff --git a/gemfiles/Gemfile_rails_6.1.rb b/gemfiles/Gemfile_rails_6.1.rb
index ae45666..e33d7b1 100644
--- a/gemfiles/Gemfile_rails_6.1.rb
+++ b/gemfiles/Gemfile_rails_6.1.rb
@@ -1,8 +1,6 @@
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
 gemspec path: '..'
 
 gem 'rails', '~> 6.1.0'
-gem 'net-smtp'
-gem 'net-pop'
-gem 'net-imap'
+gem 'sqlite3', '~> 1.4'
diff --git a/gemfiles/Gemfile_rails_7.0.rb b/gemfiles/Gemfile_rails_7.0.rb
new file mode 100644
index 0000000..2ebe1e4
--- /dev/null
+++ b/gemfiles/Gemfile_rails_7.0.rb
@@ -0,0 +1,6 @@
+source 'https://rubygems.org'
+
+gemspec path: '..'
+
+gem 'rails', '~> 7.0.0'
+gem 'sqlite3', '~> 1.4'
diff --git a/gemfiles/Gemfile_rails_7.1.rb b/gemfiles/Gemfile_rails_7.1.rb
new file mode 100644
index 0000000..7fdd267
--- /dev/null
+++ b/gemfiles/Gemfile_rails_7.1.rb
@@ -0,0 +1,6 @@
+source 'https://rubygems.org'
+
+gemspec path: '..'
+
+gem 'rails', '~> 7.1.0'
+gem 'sqlite3', '~> 1.4'
diff --git a/lib/chanko/railtie.rb b/lib/chanko/railtie.rb
index 2ce3965..c5c804f 100644
--- a/lib/chanko/railtie.rb
+++ b/lib/chanko/railtie.rb
@@ -21,14 +21,6 @@ class Railtie < Rails::Railtie
       Chanko::Loader.prepare_eager_load(mode: :zeitwerk)
     end
 
-    initializer("chanko.classic.prepare_eager_load", after: :load_environment_config) do |app|
-      # Rails5 doens't load environments/*.rb files before :set_autoload_paths.
-      # In other words, at this stage, config.eager_load cannot be determined to be true or false.
-      # But classic loader does not freeze paths on :set_autoload_paths.
-      # After all, It's ok if it is executed after :set_autoload_paths on Rails5 and Rails6(classic).
-      Chanko::Loader.prepare_eager_load(mode: :classic)
-    end
-
     initializer("chanko.eager_load_units", before: :eager_load!) do |app|
       # This is why we need handmade eager-loading
       # https://github.com/cookpad/chanko/pull/38
diff --git a/spec/chanko/function_spec.rb b/spec/chanko/function_spec.rb
index 5b39adf..ae4d9a9 100644
--- a/spec/chanko/function_spec.rb
+++ b/spec/chanko/function_spec.rb
@@ -6,20 +6,7 @@ module Chanko
       Loader.load(:example_unit)
     end
 
-    def rails5_action_view_instance
-      klass = Class.new(ActionView::Base) do
-        def current_unit
-          units.last
-        end
-
-        def units
-          @units ||= []
-        end
-      end
-      klass.new
-    end
-
-    def rails6_action_view_instance
+    def action_view_instance
       klass = Class.new(ActionView::Base.with_empty_template_cache) do
         def current_unit
           units.last
@@ -33,12 +20,7 @@ def units
     end
 
     let(:context) do
-      case Rails::VERSION::MAJOR
-      when 5
-        rails5_action_view_instance
-      when 6
-        rails6_action_view_instance
-      end
+      action_view_instance
     end
 
     let(:options) do
diff --git a/spec/chanko/test_spec.rb b/spec/chanko/test_spec.rb
index 5f63c95..bdfc03c 100644
--- a/spec/chanko/test_spec.rb
+++ b/spec/chanko/test_spec.rb
@@ -3,24 +3,11 @@
 
 module Chanko
   describe Test do
-    def rails5_action_view_instance
-      Class.new(ActionView::Base).new
-    end
-
-    def rails6_action_view_instance
+    let(:view) do
       klass = Class.new(ActionView::Base.with_empty_template_cache)
       klass.with_view_paths(nil, {}, nil)
     end
 
-    let(:view) do
-      case Rails::VERSION::MAJOR
-      when 5
-        rails5_action_view_instance
-      when 6
-        rails6_action_view_instance
-      end
-    end
-
     describe "#enable_unit" do
       it "forces to enable specified unit" do
         enable_unit(:inactive_unit)
diff --git a/spec/dummy/config/application.rb b/spec/dummy/config/application.rb
index 91f1425..c2b74b7 100644
--- a/spec/dummy/config/application.rb
+++ b/spec/dummy/config/application.rb
@@ -47,20 +47,15 @@ class Application < Rails::Application
     # config.active_record.schema_format = :sql
 
     # Version of your assets, change this if you want to expire all your assets
-    config.assets.version = '1.0'
-    config.assets.quiet = true if ::Rails::VERSION::MAJOR >= 5
-    if Rails::VERSION::MAJOR >= 6
-      if ENV['AUTOLOADER'] == 'zeitwerk'
-        Chanko::Test.logger.info("Autoloader: zeitwerk")
-        config.autoloader = :zeitwerk
-      else
-        Chanko::Test.logger.info("Autoloader: classic")
-        config.autoloader = :classic
-      end
+
+    # for Rails 6.1
+    if config.respond_to?("assets")
+      config.assets.version = '1.0'
+      config.assets.quiet = true
     end
+
+    config.autoloader = :zeitwerk
   end
 end
 
-if Rails::VERSION::MAJOR >= 6 && Rails.autoloaders.zeitwerk_enabled?
-  Rails.autoloaders.main.collapse(Rails.root.join('app', 'units', '*'))
-end
+Rails.autoloaders.main.collapse(Rails.root.join('app', 'units', '*'))