updating-buildpack-related-gems.html.md.erb

---
title: Updating Buildpack-related Gems
owner: Buildpacks
---

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This topic describes how to update [machete](https://github.com/cloudfoundry/buildpack-packager) and [buildpack-packager](https://github.com/cloudfoundry/machete), used for CF system buildpack development.

`buildpack-packager` packages buildpacks and `machete` provides an integration test framework.



The CF Buildpacks team uses the [gems-and-extensions pipeline](https://buildpacks.ci.cf-app.com/teams/main/pipelines/gems-and-extensions) to:

1. Run the integration tests for `buildpack-packager` and `machete`
2. Update the gems in the buildpacks managed by the team

## Running the Update Process

<p class="note"><strong>Note</strong>: The steps below assume you are using a Concourse deployment of the <code>buildpacks-ci</code> pipelines</p>

At the end of the process, there will be a new Github release and updates will be applied to the buildpacks.

To update the version of either gem in a buildpack:

1. Confirm that the test job `<gemname>-specs` for the gem to be updated successfully ran on the commit you plan to update.
2. Manually trigger the `<gemname>-tag` job to update ("bump") the version of the gem.
3. The `<gemname>-release` job will trigger. This will create a new Github release of the gem.
4. Each of the buildpack pipelines (e.g. the [go-buildpack pipeline](https://buildpacks.ci.cf-app.com/teams/main/pipelines/go-buildpack)) has a job which watches for new releases of the gem. When a new release is detected, the buildpack's `cf.Gemfile` is updated to that release version.
5. The commit made to the buildpack's `cf.Gemfile` triggers the full integration test suite for that buildpack.

<p class="note"><strong>Note</strong>: The final step will trigger all buildpack test suites simultaneously, causing contention for available shared BOSH-lite test environments.</p>