Bundler default gem dependency error

Have you seen the following error?

You have already activated uri 0.10.0, but your Gemfile requires uri 0.12.0. Since uri is a default gem, you can either remove your dependency on it or try updating to a newer version of bundler that supports uri as a default gem. (Gem::LoadError)

You have already activated strscan 3.0.1, but your Gemfile requires strscan 3.0.2.
Since strscan is a default gem, you can either remove your dependency on it or try updating to a
newer version of bundler that supports strscan as a default gem. (Gem::LoadError)

I've run into this with uri, strscan, and other gems. "bundle install" works fine, but running a command like "bundle exec rails assets:precompile" fails with the error above.

So what gives?

The Solution

The issue lies with Rubygems being outdated. If you update RubyGems, it will fix the issue.

gem update --system