Specifying a Ruby Version
The default Ruby version is listed along with the other supported Native Environments.
You can customize the Ruby version for your app by adding a
.ruby-version file or by setting the
ruby directive in your
Gemfile. If a version is set in both places
.ruby-version will take priority.
To avoid any version mismatch confusion it can help to a single version set in
.ruby-version and have the
Gemfile read from it, for example:
.ruby-version could look like this:
Gemfile can reference
.ruby-version via the