rails sが実行されません

rails sを実行したところ下記のように表示されました。

$ rails s
C:/Ruby27-x64/lib/ruby/2.7.0/rubygems.rb:277:in `find_spec_for_exe': Could not find 'bundler' (2.2.21) required by your C:/Users/environment/sample_app/Gemfile.lock. (Gem::GemNotFoundException)
To update to the latest version installed on your system, run `bundle update --bundler`.
To install the missing version, run `gem install bundler:2.2.21`
        from C:/Ruby27-x64/lib/ruby/2.7.0/rubygems.rb:254:in `bin_path'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/rubygems_integration.rb:223:in `bin_path'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/shared_helpers.rb:297:in `set_bundle_variables'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/shared_helpers.rb:76:in `set_bundle_environment'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/runtime.rb:22:in `setup'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler.rb:149:in `setup'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/setup.rb:20:in `block in <top (required)>'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/ui/shell.rb:136:in `with_level'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/ui/shell.rb:88:in `silence'
        from C:/Ruby27-x64/lib/ruby/2.7.0/bundler/setup.rb:20:in `<top (required)>'
        from C:/Ruby27-x64/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
        from C:/Ruby27-x64/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
        from C:/Users/yutok/environment/sample_app/config/boot.rb:3:in `<top (required)>'
        from bin/rails:3:in `require_relative'
        from bin/rails:3:in `<main>'

なのでbundle update --bundlerを実行しました。

$ bundle update
Fetching gem metadata from https://rubygems.org/.............
Resolving dependencies........
Using rake 13.0.3
Using concurrent-ruby 1.1.9
Using i18n 1.8.10
Using minitest 5.14.4
Using tzinfo 2.0.4
Using zeitwerk 2.4.2
Using activesupport 6.1.4
Using builder 3.2.4
Using erubi 1.10.0
Using racc 1.5.2
Using nokogiri 1.11.7 (x64-mingw32)
Using rails-dom-testing 2.0.3
Using crass 1.0.6
Using loofah 2.10.0
Using rails-html-sanitizer 1.3.0
Using actionview 6.1.4
Using rack 2.2.3
Using rack-test 1.1.0
Using actionpack 6.1.4
Using nio4r 2.5.7
Using websocket-extensions 0.1.5
Using websocket-driver 0.7.5
Using actioncable 6.1.4
Using globalid 0.4.2
Using activejob 6.1.4
Using activemodel 6.1.4
Using activerecord 6.1.4
Using marcel 1.0.1
Using mini_mime 1.1.0
Using activestorage 6.1.4
Using mail 2.7.1
Using actionmailbox 6.1.4
Using actionmailer 6.1.4
Using actiontext 6.1.4
Using public_suffix 4.0.6
Using addressable 2.7.0
Using bindex 0.8.1
Using msgpack 1.4.2
Using bootsnap 1.7.5
Using bundler 2.2.21
Using byebug 11.1.3
Using regexp_parser 2.1.1
Using xpath 3.2.0
Using capybara 3.35.3
Using childprocess 3.0.0
Using ffi 1.15.3 (x64-mingw32)
Using jbuilder 2.11.2
Using method_source 1.0.0
Using puma 5.3.2
Using rack-mini-profiler 2.3.2
Using rack-proxy 0.7.0
Using thor 1.1.0
Using railties 6.1.4
Using sprockets 4.0.2
Using sprockets-rails 3.2.2
Using rails 6.1.4
Using rubyzip 2.3.0
Using sassc 2.4.0 (x64-mingw32)
Using tilt 2.0.10
Using sassc-rails 2.1.2
Using sass-rails 6.0.0
Using selenium-webdriver 3.142.7
Using semantic_range 3.0.0
Using sqlite3 1.4.2
Using turbolinks-source 5.2.0
Using turbolinks 5.2.1
Using tzinfo-data 1.2021.1
Using web-console 4.1.0
Using webdrivers 4.6.0
Using webpacker 5.4.0
Bundle updated!

その後rails sを実行するも最初と同じように表示されてしまいます。