Permission errors on deploy

[brendon]

This gem seems to want to write files to its own gem directory. Is this normal? In production I get the following error and the Rails application won't boot:

Could not spawn process for application /var/www/spikeatschool/current: The application encountered the following error: Permission denied @ rb_sysopen - /var/www/xxxxxxxxxxxx/shared/bundle/ruby/2.6.0/gems/city-state-0.1.0/lib/db/states.nz (Errno::EACCES)

Is there a way to not have city-state write these files? Perhaps just load them into memory instead?