Provided by: bundler_1.3.5-2ubuntu1_all bug


       bundle-update - Update your gems to the latest available versions


       bundle update *gems [--source=NAME]


       Update  the  gems  specified  (all  gems,  if none are specified), ignoring the previously
       installed gems specified in the Gemfile.lock. In general, you should use bundle install(1)
       bundle-install.1.html to install the same exact gems and versions across machines.

       You would use bundle update to explicitly update the version of a gem.


              The  name  of  a  :git or :path source used in the Gemfile(5). For instance, with a
              :git source of,  you  would  call  bundle  update
              --source rails


       If  you run bundle update with no parameters, bundler will ignore any previously installed
       gems and resolve all dependencies again based on the latest versions of all gems available
       in the sources.

       Consider the following Gemfile(5):

           source ""

           gem "rails", "3.0.0.rc"
           gem "nokogiri"

       When  you run bundle install(1) bundle-install.1.html the first time, bundler will resolve
       all of the dependencies, all the way down, and install what you need:

           Fetching source index for
           Installing rake (10.0.2)
           Installing abstract (1.0.0)
           Installing activesupport (3.0.0.rc)
           Installing builder (2.1.2)
           Installing i18n (0.4.1)
           Installing activemodel (3.0.0.rc)
           Installing erubis (2.6.6)
           Installing rack (1.2.1)
           Installing rack-mount (0.6.9)
           Installing rack-test (0.5.4)
           Installing tzinfo (0.3.22)
           Installing actionpack (3.0.0.rc)
           Installing mime-types (1.16)
           Installing polyglot (0.3.1)
           Installing treetop (1.4.8)
           Installing mail (2.2.5)
           Installing actionmailer (3.0.0.rc)
           Installing arel (0.4.0)
           Installing activerecord (3.0.0.rc)
           Installing activeresource (3.0.0.rc)
           Installing bundler (1.0.0.rc.3)
           Installing nokogiri ( with native extensions
           Installing thor (0.14.0)
           Installing railties (3.0.0.rc)
           Installing rails (3.0.0.rc)

           Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

       As you can see, even though you have just two gems in  the  Gemfile(5),  your  application
       actually  needs 25 different gems in order to run. Bundler remembers the exact versions it
       installed in Gemfile.lock. The next time you run bundle install(1)  bundle-install.1.html,
       bundler  skips  the  dependency resolution and installs the same gems as it installed last

       After checking in the Gemfile.lock into version control and cloning it on another machine,
       running  bundle  install(1)  bundle-install.1.html  will  still  install the gems that you
       installed last time. You don´t need to worry that a new release of erubis or mail  changes
       the gems you use.

       However,  from time to time, you might want to update the gems you are using to the newest
       versions that still match the gems in your Gemfile(5).

       To do this, run bundle update, which will ignore the Gemfile.lock,  and  resolve  all  the
       dependencies again. Keep in mind that this process can result in a significantly different
       set of the 25 gems, based on the requirements of new gems that the  gem  authors  released
       since the last time you ran bundle update.


       Sometimes,  you  want  to update a single gem in the Gemfile(5), and leave the rest of the
       gems that you specified locked to the versions in the Gemfile.lock.

       For instance, in the scenario above, imagine that nokogiri releases version 1.4.4, and you
       want  to  update  it  without  updating Rails and all of its dependencies. To do this, run
       bundle update nokogiri.

       Bundler will update nokogiri and any of its dependencies, but leave alone  Rails  and  its


       Sometimes,   multiple  gems  declared  in  your  Gemfile(5)  are  satisfied  by  the  same
       second-level   dependency.   For   instance,   consider   the    case    of    thin    and

           source ""

           gem "thin"
           gem "rack-perftools-profiler"

       The thin gem depends on rack >= 1.0, while rack-perftools-profiler depends on rack ~> 1.0.
       If you run bundle install, you get:

           Fetching source index for
           Installing daemons (1.1.0)
           Installing eventmachine (0.12.10) with native extensions
           Installing open4 (1.0.1)
           Installing perftools.rb (0.4.7) with native extensions
           Installing rack (1.2.1)
           Installing rack-perftools_profiler (0.0.2)
           Installing thin (1.2.7) with native extensions
           Using bundler (1.0.0.rc.3)

       In this case, the two gems have their own set of dependencies,  but  they  share  rack  in
       common. If you run bundle update thin, bundler will update daemons, eventmachine and rack,
       which are dependencies of thin, but not open4 or perftools.rb, which are  dependencies  of
       rack-perftools_profiler.  Note  that  bundle update thin will update rack even though it´s
       also a dependency of rack-perftools_profiler.

       In short, when you update a gem using bundle update, bundler will update all  dependencies
       of that gem, including those that are also dependencies of another gem.

       In  this  scenario, updating the thin version manually in the Gemfile(5), and then running
       bundle install(1) bundle-install.1.html will only update daemons and eventmachine, but not
       rack.  For  more  information,  see the CONSERVATIVE UPDATING section of bundle install(1)


       In general, when working with an application managed with  bundler,  you  should  use  the
       following workflow:

       ·   After you create your Gemfile(5) for the first time, run

           $ bundle install

       ·   Check the resulting Gemfile.lock into version control

           $ git add Gemfile.lock

       ·   When checking out this repository on another development machine, run

           $ bundle install

       ·   When checking out this repository on a deployment machine, run

           $ bundle install --deployment

       ·   After changing the Gemfile(5) to reflect a new or update dependency, run

           $ bundle install

       ·   Make sure to check the updated Gemfile.lock into version control

           $ git add Gemfile.lock

       ·   If  bundle  install(1)  bundle-install.1.html  reports a conflict, manually update the
           specific gems that you changed in the Gemfile(5)

           $ bundle update rails thin

       ·   If you want to update all the gems to the latest possible versions  that  still  match
           the gems listed in the Gemfile(5), run

           $ bundle update

                                            April 2013                           BUNDLE-UPDATE(1)