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) 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
:pathsource used in the
Gemfile. For instance, with a
http://github.com/rails/rails.git, you would call
bundle update --source rails
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
source "http://rubygems.org" gem "rails", "3.0.0.rc" gem "nokogiri"
When you run
bundle install(1) the first time, bundler will resolve all of the dependencies, all the way down, and install what you need:
Fetching source index for http://rubygems.org/ Installing rake (0.8.7) 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 (22.214.171.124) 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(7), 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), 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) will still install the gems that you installed last time. You don’t need to worry that a new release of
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
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
UPDATING A LIST OF GEMS
Sometimes, you want to update a single gem in the
Gemfile(7), and leave the rest of the gems that you specified locked to the versions in the
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.
Sometimes, multiple gems declared in your
Gemfile(1) are satisfied by the same second-level dependency. For instance, consider the case of
gem "http://rubygems.org"gem "thin" gem "rack-perftools-profiler"
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 http://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
rack, which are dependencies of
thin, but not
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
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(7), and then running
bundle install(1) will only update
eventmachine, but not
rack. For more information, see the
CONSERVATIVE UPDATING section of
In general, when working with an application managed with bundler, you should use the following workflow:
- After you create your
Gemfilefor the first time, run$ bundle install
- Check the resulting
Gemfile.lockinto 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(7)to reflect a new or update dependency, run$ bundle install
- Make sure to check the updated
Gemfile.lockinto version control$ git add Gemfile.lock
bundle install(1)reports a conflict, manually update the specific gems that you changed in the
Gemfile(7)$ 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(7), run$ bundle update