You can specify the version of bundler to execute a command (most often you need an older version of bundler, but don't want to uninstall newer ones):

bundle _1.0.10_ -v
Bundler version 1.0.10

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An example is rails 3.2, which freezes bundler at version ~> 1.0:

Bundler could not find compatible versions for gem "bundler":
  In Gemfile: rails (~> 3.2) was resolved to 3.2.0, which depends on bundler (~> 1.0)

Current Bundler version: bundler (1.13.6)

You can solve this with:

gem install bundler -v 1.0.10
bundle _1.0.10_ install