We started getting this error on all our builds. Is this a circleci issue?
There is some more information and some workarounds in this other thread: Bundler fails to find appropriate version, despite installing appropriate version earlier in the build
Hope that helps!
That thread appears to be about a completely different issue (a custom version of bundler). In our case Circle did not install any version of Bundler, so I just ended up adding that as a build step in my
dependencies: pre: - gem install bundler
Notably, I had to do this in one repository, but not another one. I’m not sure what Circle found different in them.