git push heroku masterした際にエラーが出ます。

前提・実現したいこと

git push heroku master 出来るようにしたいです。
railsアプリをherokuにデプロイしたくて「git push heroku master」したところ、以下のエラーが出ました。

発生している問題・エラーメッセージ

remote: Building source:
remote: 
remote: -----> Building on the Heroku-20 stack
remote: -----> Determining which buildpack to use for this app
remote:  !     Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
remote:                         Detected buildpacks: Ruby,Node.js
remote:                         See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
remote: -----> Ruby app detected
remote: -----> Installing bundler 2.2.21
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.7.4
remote: -----> Installing dependencies using bundler 2.2.21
remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
remote:        You are trying to install in deployment mode after changing
remote:        your Gemfile. Run `bundle install` elsewhere and add the
remote:        updated Gemfile.lock to version control.
remote:        
remote:        If this is a development machine, remove the /tmp/build_610fcebe/Gemfile freeze 
remote:        by running ``.
remote:        
remote:        The list of sources changed
remote:        
remote:        You have added to the Gemfile:
remote:        * source: https://github.com/manfe/refile.git
remote:        
remote:        You have deleted from the Gemfile:
remote:        * source: git://github.com/manfe/refile.git
remote:        Bundler Output: You are trying to install in deployment mode after changing
remote:        your Gemfile. Run `bundle install` elsewhere and add the
remote:        updated Gemfile.lock to version control.
remote:        
remote:        If this is a development machine, remove the /tmp/build_610fcebe/Gemfile freeze 
remote:        by running ``.
remote:        
remote:        The list of sources changed
remote:        
remote:        You have added to the Gemfile:
remote:        * source: https://github.com/manfe/refile.git
remote:        
remote:        You have deleted from the Gemfile:
remote:        * source: git://github.com/manfe/refile.git
remote: 
remote:  !
remote:  !     Failed to install gems via Bundler.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed