I have tried this a number of different ways. First I tried with RVM and it was just error after error and missing dependencies. Then I tried Rbenv and it was very much the same. Now, I have a combo of chruby and ruby-install to handle my versions of Ruby, but I can't update Bundler. It says that I am currently on 1.17.2, but I need 1.17.3. How do I upgrade this? I have searched everywhere, but all the solutions seems to be for RVM.
When I try to update Bundler this is the error that I get:
$ gem update bundler
ERROR: Loading command: update (LoadError)
cannot load such file -- zlib
ERROR: While executing gem ... (NoMethodError)
undefined method `invoke_with_build_args' for nil:NilClass
I don't know what is causing this or how to get around it. Any help would be appreciated as I can't seem to find anything describing what is happening.