Jekyll 4 support?

[tibbon]

Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Bundler could not find compatible versions for gem "jekyll":
  In snapshot (Gemfile.lock):
    jekyll (= 4.2.2)

  In Gemfile:
    jekyll (~> 4.2.2)

    jekyll-material-theme was resolved to 0.6.2, which depends on
      jekyll (~> 3.5)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict