'cannot load such file -- webrick' in ruby 3.0, jekyll

Fix: bundle add webrick

tl;dr;

If you’re getting this error mesage:

`require': cannot load such file -- webrick (LoadError)

after upgrading to ruby 3.0, you need to add webrick to your Gemfile:

bundle add webrick

This should not break anything if you’re running on older rubies.

Why?

Jekyll serve fails on Ruby 3.0.