Rubrowser only works on unstable versions of Ruby

[mslinn]

The stable versions of Ruby available from rbenv are:

$ rbenv install --list
3.0.6
3.1.4
3.2.2
jruby-9.4.5.0
mruby-3.2.0
picoruby-3.0.0
truffleruby-23.1.1
truffleruby+graalvm-23.1.1

Only latest stable releases for each Ruby implementation are shown.
Use 'rbenv install --list-all / -L' to show all local versions.

Attempt 1

$ rbenv global 3.1.2

$ gem install rubrowser
*... Lots of output, not shown ...*

$ rubrowser > rubrowser.html
rubrowser > rubrowser.html
warning: parser/current is loading parser/ruby31, which recognizes 3.1.6-compliant syntax, but you are running 3.1.2.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.

Attempt 2

$ rbenv global 3.2.2

$ gem install rubrowser
*... Lots of output, not shown ...*

$ rubrowser > rubrowser.html
rubrowser > rubrowser.html
warning: parser/current is loading parser/ruby32, which recognizes 3.2.4-compliant syntax, but you are running 3.2.2.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.