-----> Building on the Heroku-20 stack
-----> Using buildpacks:
1. heroku/ruby
2. https://github.com/heroku/heroku-buildpack-static
-----> Ruby app detected
-----> Installing bundler 2.2.16
-----> Removing BUNDLED WITH version in the Gemfile.lock
-----> Compiling Ruby/Rack
###### WARNING:
Your app was upgraded to bundler 2.2.16.
Previously you had a successful deploy with bundler 2.0.2.
If you see problems related to the bundler version please refer to:
https://devcenter.heroku.com/articles/bundler-version#known-upgrade-issues
-----> Using Ruby version: ruby-2.7.1
Purging Cache. Changing stack from heroku-16 to heroku-20
-----> Installing dependencies using bundler 2.2.16
Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.
If this is a development machine, remove the /tmp/build_b26a3872/Gemfile freeze
by running ``.
The dependencies in your gemfile changed
You have added to the Gemfile:
* jekyll (~> 4.2.0)
You have deleted from the Gemfile:
* jekyll (~> 4.0)
Bundler Output: You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.
If this is a development machine, remove the /tmp/build_b26a3872/Gemfile freeze
by running ``.
The dependencies in your gemfile changed
You have added to the Gemfile:
* jekyll (~> 4.2.0)
You have deleted from the Gemfile:
* jekyll (~> 4.0)
!
! Failed to install gems via Bundler.
!
! Push rejected, failed to compile Ruby app.
! Push failed