Clearance doesn't actually use those gems, so I think you can safely skip them in the generated app. You can skip almost all the gemfile entries like this: `rails new farfola --skip-javascript --skip-sprockets --skip-git`. The only two dependencies that generates are `rails` and `sqlite3`. If you add these to clearance's development dependencies, you should be able to use `--local`, which is much faster and prevents versions from jumping around between individual test runs.