Dennis Ostendorf
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Posted in What's New In Ruby 3.3 Discussion
This might be because you don't have Rust installed.
If so, first uninstall your Ruby 3.3.0, then install Rust (https://www.rust-lang.org/tools/install), and then re-install Ruby 3.3.0.
Now RUBY_YJIT_ENABLE=1 ruby -v should show you that it's using YJIT (this worked for me using rbenv)