Bundler 4 roadmap · Issue #8650 · rubygems/rubygems

We have a plan to release Bundler 4 by the end of this year. This is a placeholder ticket to explain the motivations and what we expect to include in this major release. Bundler currently keeps a branched code base, where there are a number of feature flags that will be enabled only once a major version is released, because they are considered breaking changes. However, a real major version has not happened for many years. We did release Bundler 2 back in 2019, but that just delayed real breaking changes to future Bundler 3 and only dropped support for old rubies. So, in practice, these features have remained hidden for a long time and our users don’t benefit from them. This also causes maintenance overhead, a slower CI (due to the extra Bundler 2 vs Bundler 3 dimension), makes things harder for contributors, and makes an already complex code base more complex.