BUNDLE-UPDATE(1)					      BUNDLE-UPDATE(1)



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

SYNOPSIS
       bundle update *gems [--group=NAME] [--source=NAME] [--local]

DESCRIPTION
       Update  the  gems specified (all gems, if none are specified), ignoring
       the previously installed gems specified in the  Gemfile.lock.  In  gen-
       eral, 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.

OPTIONS
       --group=<name>
	      Only  update  the gems in the specified group. For instance, you
	      can update all gems in the development group with bundle	update
	      --group  development.  You  can  also  call  bundle update rails
	      --group test to update the rails gem and all gems  in  the  test
	      group, for example.

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

       --local
	      Do not attempt to fetch gems remotely  and  use  the  gem  cache
	      instead.

UPDATING ALL GEMS
       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 "https://rubygems.org"

	   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 gem metadata from https://rubygems.org/.........
	   Resolving dependencies...
	   Installing builder 2.1.2
	   Installing abstract 1.0.0
	   Installing rack 1.2.8
	   Using bundler 1.7.6
	   Installing rake 10.4.0
	   Installing polyglot 0.3.5
	   Installing mime-types 1.25.1
	   Installing i18n 0.4.2
	   Installing mini_portile 0.6.1
	   Installing tzinfo 0.3.42
	   Installing rack-mount 0.6.14
	   Installing rack-test 0.5.7
	   Installing treetop 1.4.15
	   Installing thor 0.14.6
	   Installing activesupport 3.0.0.rc
	   Installing erubis 2.6.6
	   Installing activemodel 3.0.0.rc
	   Installing arel 0.4.0
	   Installing mail 2.2.20
	   Installing activeresource 3.0.0.rc
	   Installing actionpack 3.0.0.rc
	   Installing activerecord 3.0.0.rc
	   Installing actionmailer 3.0.0.rc
	   Installing railties 3.0.0.rc
	   Installing rails 3.0.0.rc
	   Installing nokogiri 1.6.5

	   Bundle complete! 2 Gemfile dependencies, 26 gems total.
	   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 26 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 time.

       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 Gem-
       file(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.

UPDATING A LIST OF GEMS
       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 dependencies.

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



	   source "https://rubygems.org"

	   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 https://rubygems.org/
	   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)  bun-
       dle-install.1.html.

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

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

	   $ bundle install

       o   Check the resulting Gemfile.lock into version control

	   $ git add Gemfile.lock

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

	   $ bundle install

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

	   $ bundle install --deployment

       o   After  changing  the  Gemfile(5)  to reflect a new or update depen-
	   dency, run

	   $ bundle install

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

	   $ git add Gemfile.lock

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

	   $ bundle update rails thin

       o   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






				   May 2015		      BUNDLE-UPDATE(1)
