Why won't bundler install JSON gem?

I get the following error when attempting to run

.

DEBUG [dc362284]    Bundler::GemNotFound: Could not find json-1.8.1.gem for installation

DEBUG [dc362284]    An error occurred while installing json (1.8.1), and Bundler cannot continue.

DEBUG [dc362284]    Make sure that `gem install json -v '1.8.1'` succeeds before bundling.

It may be important to note that this deployment was working, than I upgraded to Ruby 2.1.0 to remove an encoding error. I upgraded locally which worked fine. I ran and then changed my file to reflect this Ruby upgrade.

The command works locally, but produces the same above error when I ssh onto the destination server and run this command.

If I run I can see this in the list of gems.

...

jquery-rails (3.0.4)

json (1.8.1)

less (2.3.2)

...

If I try the recommended solution Locally and on the destination server I get the following output:

Building native extensions.  This could take a while...

Successfully installed json-1.8.1

Parsing documentation for json-1.8.1

Done installing documentation for json after 0 seconds

1 gem installed

So it appears the gem is installed, right? Why is this happening? How can I solve this? Any help would be greatly appreciated.