I tried running Jekyll and I got the following error messages. I did not encounter this error message before.
Unknown ruby interpreter version (do not know how to handle): RUBY_VERSION.
-bash: /usr/local/bin/jekyll: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby: bad interpreter: No such file or directory
You might also look into Ruby Version Manager, it really takes the pain out of relying on the OS version of Ruby. Thus, after installing RVM, Ruby becomes a free agent and you can specify which version of Ruby to use per site.
If this happened after you updated, you’ll have to reinstall Jekyll and any other gems you’re using. sudo gem install jekyll should get you going; you might have a few more dependencies (the Gemfile can help with that).
Anyway, there’s no need to jump through a bunch of RVM or homebrew/ports hoops to get Jekyll going again.