diff --git a/lib/line/bot.rb b/lib/line/bot.rb
index f95874f4..f575cf1a 100644
--- a/lib/line/bot.rb
+++ b/lib/line/bot.rb
@@ -1,10 +1,10 @@
-# Copyright 2016 LINE
+# Copyright 2016-2024 LINE
 #
 # LINE Corporation licenses this file to you under the Apache License,
 # version 2.0 (the "License"); you may not use this file except in compliance
 # with the License. You may obtain a copy of the License at:
 #
-#     http://www.apache.org/licenses/LICENSE-2.0
+#     http://www.apache.org/licenses/LICENSE_2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
@@ -12,6 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+# V1
 require 'line/bot/util'
 require 'line/bot/client'
 require 'line/bot/event'
@@ -19,3 +20,17 @@
 require 'line/bot/api'
 require 'line/bot/httpclient'
 require 'line/bot/api/version'
+
+# V2
+require 'line/bot/v2/webhook_parser'
+
+## OpenAPI
+require 'line/bot/v2/channel_access_token/core'
+require 'line/bot/v2/insight/core'
+require 'line/bot/v2/liff/core'
+require 'line/bot/v2/manage_audience/core'
+require 'line/bot/v2/messaging_api/core'
+require 'line/bot/v2/module/core'
+require 'line/bot/v2/module_attach/core'
+require 'line/bot/v2/shop/core'
+require 'line/bot/v2/webhook/core'
diff --git a/line-bot-api.gemspec b/line-bot-api.gemspec
index a4cf6ba1..88d4b5df 100644
--- a/line-bot-api.gemspec
+++ b/line-bot-api.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/line/line-bot-sdk-ruby"
   spec.license       = "Apache-2.0"
 
-  spec.files         = %w(CONTRIBUTING.md LICENSE README.md line-bot-api.gemspec) + Dir['lib/**/*.rb']
+  spec.files         = %w(CONTRIBUTING.md LICENSE README.md line-bot-api.gemspec) + Dir['lib/**/*.rb'] + Dir['sig/**/*.rbs']
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]