sudo gem uninstall rack (<\/span>answer yes to remove dependencies and continue <\/span>with uninstall)<\/span><\/div>mkdir ~/sources<\/div>cd<\/span> ~/sources<\/div>git clone git://github.com/rack/rack.git<\/div>cd <\/span>rack<\/div>sudo rake gem VERSION<\/span>=<\/span>1.0.0<\/div>sudo gem install rack-1.0.0.gem<\/div><\/pre><\/div>\n \n <\/div>\n\n