Getting error: update rubygems while deploying/migrating to Heroku

I am getting the following error when migrating to Heroku.

Installing hoe (2.9.4) /usr/ruby1.9.2/lib/ruby/1.9.1/rubygems/installer.rb:170:in >install': hoe requires RubyGems version >= 1.4. Try 'gem update --system' to update RubyGems itself. (Gem::InstallError)`

It sais that the ruby gems version is out of date. Somebody knows how i could solve this problem?

using rails 3.0.5 with ruby 1.9.2

bundler

Using rake (0.8.7) 
Using RedCloth (4.2.2) 
Using abstract (1.0.0) 
Using activesupport (3.0.5) 
Using builder (2.1.2) 
Using i18n (0.5.0) 
Using activemodel (3.0.5) 
Using erubis (2.6.6) 
Using rack (1.2.2) 
Using rack-mount (0.6.14) 
Using rack-test (0.5.7) 
Using tzinfo (0.3.26) 
Using actionpack (3.0.5) 
Using mime-types (1.16) 
Using polyglot (0.3.1) 
Using treetop (1.4.9) 
Using mail (2.2.17) 
Using actionmailer (3.0.5) 
Using arel (2.0.9) 
Using activerecord (3.0.5) 
Using activeresource (3.0.5) 
Using archive-tar-minitar (0.5.2) 
Using authlogic (2.1.6) 
Using xml-simple (1.0.15) 
Using aws-s3 (0.6.2) 
Using bcrypt-ruby (2.1.4) 
Using block_helpers (0.3.3) 
Using bundler (1.0.10) 
Using columnize (0.3.2) 
Using diff-lcs (1.1.2) 
Using json (1.5.1) 
Using gherkin (2.3.6) 
Using term-ansicolor (1.0.5) 
Using cucumber (0.10.2) 
Using nokogiri (1.4.4) 
Using cucumber-rails (0.4.1) 
Using daemons (1.0.10) 
Using database_cleaner (0.6.7) 
Using factory_girl (1.3.3) 
Using faker (0.9.5) 
Using fastercsv (1.5.4) 
Using formtastic (1.2.3) 
Using gem_plugin (0.2.3) 
Using haml (3.0.25) 
Using hoe (2.9.4) 
Using thor (0.14.6) 
Using railties (3.0.5) 
Using rails (3.0.5) 
Using kaminari (0.12.0) 
Using ruby_core_source (0.1.5) 
Using linecache19 (0.5.12) 
Using meta_search (1.0.4) 
Using mongrel (1.2.0.pre2) 
Using paperclip (2.3.11) 
Using pg (0.11.0) 
Using pickle (0.4.7) 
Using populator (1.0.0) 
Using render_inheritable (1.0.0) 
Using rspec-core (2.5.1) 
Using rspec-expectations (2.5.0) 
Using rspec-mocks (2.5.0) 
Using rspec (2.5.0) 
Using rspec-rails (2.5.0) 
Using ruby-debug-base19 (0.11.25) 
Using ruby-debug19 (0.11.6) 
Using test-unit (1.2.3) 
Using will_paginate (3.0.pre2) 
Using typus (3.0.10) from https://github.com/fesplugas/typus.git (at master) 
Using webrat (0.7.3)

UPDATE:

heroku stack

aspen-mri-1.8.6
* bamboo-ree-1.8.7
bamboo-mri-1.9.2 (prepared, will migrate on next git push)

UPDATE2:

error trace

Installing hoe (2.9.4) /usr/ruby1.9.2/lib/ruby/1.9.1/rubygems/installer.rb:170:in `install': hoe requires RubyGems version >= 1.4. Try 'gem update --system' to update RubyGems itself. (Gem::InstallError)
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/source.rb:95:in `install'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/installer.rb:55:in `block in run'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `block in each'
    fro开发者_开发知识库m /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `each'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `each'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/installer.rb:44:in `run'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/installer.rb:8:in `install'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/cli.rb:225:in `install'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/vendor/thor/task.rb:22:in `run'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/vendor/thor.rb:246:in `dispatch'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/vendor/thor/base.rb:389:in `start'
    from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/bin/bundle:13:in `<top (required)>'
    from /usr/ruby1.9.2/bin/bundle:19:in `load'
    from /usr/ruby1.9.2/bin/bundle:19:in `<main>'
   FAILED: http://devcenter.heroku.com/articles/bundler
!Heroku push rejected, failed to install gems via Bundler

Ok i solved it.

hoe simply doesnt work with heroku because they dont support new versions of rubygems (this is such a pain with heroku)

I added the hoe gem here:

group :test, :development do
  gem "hoe"
end

and typed the following in my console:

heroku config:add BUNDLE_WITHOUT="development:test"