```ruby
require_relative 'boot'

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module LoveEquation
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults "6.0"
    # Default locale Japanese
    config.i18n.default_locale = :ja

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration can go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded after loading
    # the framework and any gems in your application.
  end
end
```

Upgrade Rails 5.2.6 -> 6.0.0
user
```ruby
require_relative 'boot'

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module LoveEquation
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults "6.0"
    # Default locale Japanese
    config.i18n.default_locale = :ja
    Rails.application.config.action_controller.urlsafe_csrf_tokens = false

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration can go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded after loading
    # the framework and any gems in your application.
  end
end
```
assistant