[Rails] rake probleme

hi,
i want to test my routes, when i make : rake routes i have this
message

You have already activated rake 0.9.2, but your Gemfile requires rake
0.8.7. Consider using bundle exec.

i thought i have update the rake, and i dont know how to back to the
older one used in my application means the rake 0.8.7
please help me.
thanks

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