This project is not maintained anymore. Use rbenv.

[tymat]

Nobody has touched this repository for years and the latest Capistrano breaks this gem. Use rbenv instead or use an alternative to Capistrano entirely.

[johnvuko]

Or just use the version maintained by rvm itself: https://github.com/rvm/rvm1-capistrano3

[bretweinraub]

What makes rvm1-capistrano3 authoritative?

For example:

https://rvm.io/deployment/capistrano

there is no mention of it here.

[Faq]

Addition to what @bretweinraub mentioned, also https://github.com/rvm/rvm1-capistrano3 is 7 years not updated.
Seems there is only 1 option = rbenv