rubyバージョンUP後 rails sできない

質問内容・実現したいこと

質問内容

herokuのデプロイの際にrubyのバージョンアップが必要になり

ruby 2.5.1 から ruby 3.1.0 に変更しrails s するもerrorになります。

実現したいこと

ローカルのrailsサーバーにつながりたい。

教えていただきたいこと

errorの解消方法またはヒント
errorの読み解き方
ここをこうした方がいいよなどご指摘をいただきたいです。

よろしくお願いします。

現状発生している問題・エラーメッセージ

$ rails s
/Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require': cannot load such file -- net/smtp (LoadError)
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/loaded_features_index.rb:93:in `register'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:44:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:324:in `block in require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:291:in `load_dependency'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:324:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/mail-2.7.1/lib/mail.rb:9:in `<module:Mail>'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/mail-2.7.1/lib/mail.rb:3:in `<main>'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/loaded_features_index.rb:105:in `register'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:324:in `block in require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:291:in `load_dependency'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:324:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/actionmailbox-6.0.4.4/lib/action_mailbox/mail_ext.rb:3:in `<main>'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/loaded_features_index.rb:105:in `register'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-6.0.4.4/lib/active_support/dependencies.rb:324:in `block in require'
        from /Users/mark_naito/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/activesupport-

行ったこと

bash
#1 インストールできるrubyのバージョンを確認
rbenv install --list

2.6.9
2.7.5
3.0.3
3.1.0
jruby-9.3.2.0
mruby-3.0.0
rbx-5.0
truffleruby-21.3.0
truffleruby+graalvm-21.3.0

Only latest stable releases for each Ruby implementation are shown.
Use 'rbenv install --list-all / -L' to show all local versions.

#2 リスト確認
rbenv versions
  system
* 2.5.1 (set by /Users/mark_naito/.rbenv/version)
  2.6.3
  2.6.4
  2.6.5
  2.6.6

#2 最新のrubyをインストール
rbenv install 3.1.0
Downloading openssl-1.1.1l.tar.gz...
-> https://dqw8nmjcqpjn7.cloudfront.net/0b7a3e5e59c34827fe0c3a74b7ec8baef302b98fa80088d7f9153aa16fa76bd1
Installing openssl-1.1.1l...
Installed openssl-1.1.1l to /Users/mark_naito/.rbenv/versions/3.1.0

Downloading ruby-3.1.0.tar.gz...
-> https://cache.ruby-lang.org/pub/ruby/3.1/ruby-3.1.0.tar.gz
Installing ruby-3.1.0...
ruby-build: using readline from homebrew
Installed ruby-3.1.0 to /Users/mark_naito/.rbenv/versions/3.1.0

#2 再度確認
rbenv versions

  system
* 2.5.1 (set by /Users/mark_naito/.rbenv/version)
  2.6.3
  2.6.4
  2.6.5
  2.6.6
  3.1.0

#4 ruby 3.1.0を全体に採用
mark_naito@MacBook-Pro ~ % rbenv global 3.1.0

#5　バージョンを切り替えとで変更を反映             
mark_naito@MacBook-Pro ~ % rbenv rehash

#6　しっかり変更されているか確認
mark_naito@MacBook-Pro ~ % ruby -v
ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-darwin21]

#7 gemfileと.ruby-versionsファイルのrubyバージョンを3.1.0に変更

#８ ホームディレクトリで実装していたので
mark_naito@MacBook-Pro ~ % bundle install
Could not locate Gemfile

#9 開発中のアプリに移動
mark_naito@MacBook-Pro ~ % cd my_application 
mark_naito@MacBook-Pro my_application % cd lets_hang_out 

#10 ファイルと実際のバージョンが一致しない
mark_naito@MacBook-Pro lets_hang_out % bundle install   
Your Ruby version is 2.5.1, but your Gemfile specified 3.1.0

#11 開発中のアプリに移動するもrubyのバージョンはそのまま
mark_naito@MacBook-Pro lets_hang_out % ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin20]

#12 確認
mark_naito@MacBook-Pro lets_hang_out % rbenv versions
  system
* 2.5.1 (set by /Users/mark_naito/my_application/lets_hang_out/.ruby-version)
  2.6.3
  2.6.4
  2.6.5
  2.6.6
  3.1.0

#13 rubyのバージョンを切り替える
mark_naito@MacBook-Pro lets_hang_out % rbenv global 3.1.0

#14 インストールしたrubyを使用できるようにする
mark_naito@MacBook-Pro lets_hang_out % rbenv rehash

#15 rubyのバージョンが切り替わっているか確認するも切り替わっていない。。
mark_naito@MacBook-Pro lets_hang_out % ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin20]

#16 localでrubyのバージョンを切り替える
mark_naito@MacBook-Pro lets_hang_out % rbenv local 3.1.0

#17 確認
mark_naito@MacBook-Pro lets_hang_out % ruby -v          
ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-darwin21]

#18 ruby2.5.1で生成されたGemfile.lookを一旦削除
mark_naito@MacBook-Pro lets_hang_out % rm gemfile.lock

#19  Gemfile.lockをRubyバージョン3.0.1で再生成
mark_naito@MacBook-Pro lets_hang_out % bundle install
Fetching gem metadata from https://rubygems.org/.........

#20 再生成されたGemfile.lockに記載されているRUBY VERSIONと一致しているのを確認し一致
ruby -v
ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-darwin21]

該当のソースコード

Gemfile

ruby
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '3.1.0'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails', branch: 'main'
gem 'rails', '~> 6.0.4'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 4.1'
# Use SCSS for stylesheets
gem 'sass-rails', '>= 6'
# Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
gem 'webpacker', '~> 4.0'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.7'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use Active Model has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Active Storage variant
# gem 'image_processing', '~> 1.2'

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.4.2', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]

  # test
  gem 'factory_bot_rails'
  gem 'rspec-rails'
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '~> 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

# Assets
gem 'bootstrap-sass'
gem 'font-awesome-rails'
gem 'jquery-rails'

# Code analyze
gem 'rails_best_practices'
gem 'rubocop'

# Debugger
gem 'better_errors'
gem 'binding_of_caller'