How to update my rails 3.0.0 beta 4 app to rails 3.0.0 RC and eventually to Rails 3?

My first problem is a bundler conflict

$ bundle install
Fetching source index from
No compatible versions could be found for required dependencies:
Conflict on: "bundler":
* bundler (0.9.26) activated by bundler (= 0.9.26, runtime)
* bundler (>= 1.0.0.rc.1, runtime) required in Gemfile
All possible versions of origin requirements conflict.

After I figure that out,

Is there anything I need to do to change my Beta 4 Rails app to work on the RC?

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