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What's New In Ruby 3.3 Discussion

Discussion for What's New In Ruby 3.3

Happy Holidays and New Year everyone! 🥳


And ruby-build itself now has 3.3 with ruby-build--20231225 (working with rbenv, not sure on asdf)


ASDF users use an env var to use the latest ruby-build:

ASDF_RUBY_BUILD_VERSION=master asdf install ruby 3.3.0

Thanks Chris!

How soon will we see an update to to support Ruby 3.3.0?



Probably today.


Will this affect how errors are displayed in Rails 7.2? Or it's too difficult to predict that since it hasn't been released yet?


Thanks Chris!
You are rock


Hi Chris, I tried -> RUBY_YJIT_ENABLE=1 ruby -v but I can't see the YJIT. Do I need to install it separately? I am using Mac M2 MacBookPro.


This might be because you don't have Rust installed.

If so, first uninstall your Ruby 3.3.0, then install Rust (, 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)


ya, it works similar to yours, thanks for sharing that I need to install rust.

before install, need to uninstall

asdf uninstall ruby 3.3.0

note: do not install rust via asdf, it won't work for me.

  1. curl --proto '=https' --tlsv1.2 -sSf | sh // choose option 1 and enter; close Mac terminal and open again.
  2. rustc --version // make sure can see rustc version
  3. export RUBY_CONFIGURE_OPTS=--enable-yjit
  4. asdf install ruby 3.3.0
  5. asdf global ruby 3.3.0
  6. gem update --system
  7. gem install rails -v 7.1.2 // need to install this again
  8. ruby -v
  9. RUBY_YJIT_ENABLE=1 ruby -v
  10. rails -v

hope it helps others.

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