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 deleted the project and made a git clone from the Heroku app, don´t know if it is a good solution, but it worked for me.

Answer 2

Even with bundler 2 on the system this error still happens when deploying an app with Ruby 2.6 since Ruby 2.6 ships with a default version of bundler.

If you are using Ruby 2.6 then upgrade to Ruby 2.6.1 to avoid this issue.

Answer 3

If you're using a docker image like FROM:ruby:2.X.X then you can do the following:

FROM ruby:2.6.2
... # omitted
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN gem uninstall bundler
RUN gem install bundler -v 2.1.4
RUN bundle update --bundler
RUN bundle install
... # omitted

Answer 4

For local system

gem install bundler:2.0.0.pre.1
bundle _2.0.0.pre.1_ install

Where "2.0.0.pre.1" is whatever version you need to bundle with.

Don't delete your Gemfile.lock for this, it's there for a reason.

Answer 5

I got the same issue in my local system, my ruby version was low due to which the error was occurring. Fixed it by switching it to updated versions of ruby.

Answer 6

The Ruby 2.6.0 is not the case of this problem. The default version of Bundler incorrectly invoked when using bin stubs. For more details please refer the following link

Solution: Bundler 2 is available on the system and is the latest version, So it should be invoked instead of the default bundler version.

Update Rubygems

gem update --system

Update bundler

gem install bundler

Update Gemfile.lock in your project

bundler update --bundler