Rubygems updated to 2.6.13 for Ruby 2.4.1

Change effective on 28 August 2017

The version of rubygems bundled with Ruby 2.4.1 was updated to 2.6.13 on heroku-16 and cedar-14 stacks. You can see the current rubygems version associated with on the Ruby Version Support page.

To see the current version of rubygems installed for your app you can run:

$ heroku run bash

and then

$ ruby -v
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
$ gem -v