我从 ruby 2.7.1 更新到 3.1.1，然后删除 Gemfile.lock 并运行bundle update（它位于开发分支上，所以如果这是一个坏主意，我可以扔掉它，我只是想看看它是否有效）。
bundle update成功了，但是当我启动服务器时：
rails s
=> Booting Puma
=> Rails 7.0.2.2 application starting in development
=> Run `bin/rails server --help` for more startup options
Exiting
/Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:430:in `visit_Psych_Nodes_Alias': Unknown alias: default (Psych::BadAlias)
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/visitor.rb:30:in `visit'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/visitor.rb:6:in `accept'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:35:in `accept'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:345:in `block in revive_hash'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:343:in `each'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:343:in `each_slice'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:343:in `revive_hash'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:167:in `visit_Psych_Nodes_Mapping'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/visitor.rb:30:in `visit'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/visitor.rb:6:in `accept'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:35:in `accept'
from /Users/st/.rbenv/versions/3.1.1/lib/ruby/3.1.0/psych/visitors/to_ruby.rb:345:in `block in …