We no longer use non-deterministic versions like lts/gallium. This is not supported by all tools. In particular asdf Show archive.org snapshot is sunsetting its support for LTS aliases.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

Prevents you from data breaches and liability risks
Upgrade at your own pace
Works with modern Rubies

Updated: Documenting your Rails project's Node.js version in .nvmrc

Rails Long Term Support