Update to new ruby version

Can you please update this to new ruby version because I wanna deploy to Heroku but Heroku deosn't support you version. Thanks

Start by inspecting the repository for its declared Ruby version and Heroku deployment settings. Confirm which newer Ruby version is supported, then update the relevant declaration and verify the project can deploy to Heroku. The issue does not name a file or test, so locating the version configuration is the first task.

Written by the indexing model from the issue text.