and the version being used for [CNG](https://gitlab.com/gitlab-org/build/cng/blob/master/ci_files/variables.yml#L12).
### Updating Go version
We should always use a [supported version](https://golang.org/doc/devel/release.html#policy)
of Go, i.e., one of the three most recent minor releases, and should always use
the most recent patch-level for that version, as it may contain security fixes.
Changing the version affects every project being compiled, so it's important to
ensure that all projects have been updated to test against the new Go version
before changing the package builders to use it. Despite [Go's compatibility promise](https://golang.org/doc/go1compat),
changes between minor versions can expose bugs or cause problems in our projects.
Once you've picked a new Go version to use, the steps to update Omnibus and CNG
are:
-[Create a merge request in the CNG project](https://gitlab.com/gitlab-org/build/CNG/edit/master/ci_files/variables.yml?branch_name=update-go-version),
updating the `GO_VERSION` in `ci_files/variables.yml`.
- Create a merge request in the [`gitlab-omnibus-builder` project](https://gitlab.com/gitlab-org/gitlab-omnibus-builder),
updating every file in the `docker/` directory so the `GO_VERSION` is set
appropriately. [Here's an example](https://gitlab.com/gitlab-org/gitlab-omnibus-builder/merge_requests/125/diffs).
- Tag a new release of `gitlab-omnibus-builder` containing the change.
-[Create a merge request in the `gitlab-omnibus` project](https://gitlab.com/gitlab-org/omnibus-gitlab/edit/master/.gitlab-ci.yml?branch_name=update-gitlab-omnibus-builder-version),
updating the `BUILDER_IMAGE_REVISION` to match the newly-created tag.
To reduce unnecessary differences between two distribution methods, Omnibus and
CNG **should always use the same Go version**.
---
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[Return to Development documentation](../README.md).
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