Keeping Up with Trunk

I have a project with rspec installed as a plugin using
svn:externals. Here are my externals:

rspec_on_rails svn://rubyforge.org/var/svn/rspec/trunk/
rspec_on_rails
rspec svn://rubyforge.org/var/svn/rspec/trunk/
rspec

I just did an svn up on both and now have a version mismatch:

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Your RSpec on Rails plugin is incompatible with your installed RSpec.

RSpec : 1.1.0 (r2804)
RSpec on Rails : r2817

Make sure your RSpec on Rails plugin is compatible with your RSpec gem.
See http://rspec.rubyforge.org/documentation/rails/install.html for
details.
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Any idea why this might be happening?