Why is the Ruby version on OS X machines going up and down a minor patch level?

Build Environment
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1

The past few days it seems like the ruby versions available via chruby on OS X machines seem be inconsistent. We need ruby 2.4, so we have a build step that does chruby ruby-2.4.4, however our builds fail randomly because sometimes it’s ruby-2.4.3 that is available and sometimes ruby-2.4.2. What’s up with this?

We’re using Circle 2.0 and macOS with Xcode 9.3.0

2

I’ve no idea, but are the Dockerfiles available for these on Github, so you can see if they’re actually being rebuilt? It does strike me as something that CircleCI devs would not be doing deliberately.