Bundler: You must use Bundler 2 or greater with this lockfile

Question

I\'m working with heroku and every time I try to push my app this message shows out:

remote: Compressing source files... done.
remote: Building source:
remo         


        

Answer 1

I had the same problem today.

In my case the problem was caused by using rvm gemset other than latest I have with ruby 2.7.1 and bundler 2.1.4 (same bundle Gemfile was locked with).

So just take a look at your rvm environment before doing any other solution listed here. Specially if you're running your project on production.

Happy hacks !