thoughtbot--shoulda-matchers/script/update_gems_in_all_appraisals

#!/bin/bash

SUPPORTED_VERSIONS=$(<script/SUPPORTED_VERSIONS)

update-gems-for-version() {
  local version="$1"
  (export RBENV_VERSION=$version; bundle update "${@:2}" && bundle exec appraisal update "${@:2}")
}

for version in $SUPPORTED_VERSIONS; do
  echo
  echo "*** Updating gems for $version ***"
  update-gems-for-version "$version" "$@"
done