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$ sed -i '/RUBY VERSION/,$d' Gemfile.lock
$ bundle update --source excon
:
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies.....
Bundler could not find compatible versions for gem "bundler":
In Gemfile:
bundler-audit (~> 0.6) was resolved to 0.6.0, which depends on
bundler (~> 1.2)

rails (~> 5.1.4) was resolved to 5.1.4, which depends on
bundler (>= 1.3.0)

Current Bundler version:
bundler (2.3.6)

Your bundle requires a different version of Bundler than the one you're running.
Install the necessary version with `gem install bundler:1.17.3` and rerun
bundler using `bundle _1.17.3_ update --source excon`

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