renovate/lib/modules/manager/gomod/readme.md

Updating of Go mod and toolchain directives

In go.mod, the go directive essentially means "Compatible with this version or later". It is generally recommended for Go projects to not bump this version unless necessary, and therefore Renovate's default behavior is not to propose upgrades to it. If you need to update it once or irregularly, it's recommended to do it manually. If you are sure you want to always bump it to latest, then you need the following configuration:

{
  "packageRules": [
    {
      "matchManagers": ["gomod"],
      "matchDepNames": ["go"],
      "matchDepTypes": ["golang"],
      "rangeStrategy": "bump"
    }
  ]
}

In go.mod, the toolchain directive essentially means "Use this exact version of go". Unlike the go directive, it's valid to keep bumping this, and you should see updates to it proposed by default.

Only suggesting updates that match your go directive

In go.mod, the go directive essentially means "Compatible with this version or later". It is generally recommended for Go projects to not bump this version unless necessary.

As noted above, Renovate doesn't update this directly, but dependency updates can lead to a package you rely on bumping their go directive, which means you can't accept the proposed update without also bumping your go directive.

To make this simpler, you can use constraintsFiltering=strict to make sure that Renovate will only propose updates that match the constraints you specify.

For example, given the go.mod:

module example

go 1.24.0

require golang.org/x/mod v0.32.0

We can then configure Renovate to set the same constraint when updating any Go dependencies:

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "packageRules": [
    {
      "description": "Ensure source compatibility with Go version used by this project",
      "matchManagers": ["gomod"],
      "constraintsFiltering": "strict"
    }
  ]
}

In this case, Renovate would only propose an update to a version of golang.org/x/mod that supports Go 1.24.x.

!!! note It is recommended to read the constraintsFiltering documentation and Language constraints and upgrading for more information about how the filtering works and how strict this can be.

Post-Update Options

You might be interested in the following postUpdateOptions:

1. gomodTidy - if you'd like Renovate to run go mod tidy after every update before raising the PR
2. This is implicitly enabled for major updates if the user has enabled the option gomodUpdateImportPaths
3. gomodTidy1.17 - if you'd like Renovate to run go mod tidy -compat=1.17 after every update before raising the PR
4. gomodTidyE - if you'd like Renovate to run go mod tidy -e after every update before raising the PR
5. gomodTidyAll - if you'd like Renovate to also run go mod tidy on every other module which depends on the updated one through a local replace directive
   • This implies gomodTidy, needs Go 1.20 or later, and should not be combined with gomodMassage
6. gomodUpdateImportPaths - if you'd like Renovate to update your source import paths on major updates before raising the PR
7. gomodMassage - to enable massaging of all replace statements prior to running go so that they will be ignored
8. goGenerate - to run go generate ./... after vendoring.
   • Will only run if the allowedUnsafeExecutions global option includes goGenerate
   • This will not install any additional tools required to run go generate, you can use tools as one option
   • If gomodTidy is not set, you may encounter failures in the Go toolchain due to missing go.sum entry

When Renovate is running using binarySource=install (such as in the Mend Renovate App) then it will pick the latest compatible version of Go to run, i.e. the latest 1.x release. Even if the go.mod has a version like go 1.22, Renovate will treat it as a ^1.22 constraint and not =1.22.

Unless matching tool directives exist, indirect updates are disabled by default. To enable them, add a package rule such as:

{
  "packageRules": [
    {
      "matchManagers": ["gomod"],
      "matchDepTypes": ["indirect"],
      "enabled": true
    }
  ]
}

Private Modules Authentication

Before running the go commands to update the go.sum, Renovate exports git insteadOf directives in environment variables.

The following logic is executed prior to "artifacts" updating:

The token from the hostRules entry matching hostType=github and matchHost=api.github.com is added as the default authentication for github.com. For those running against github.com, this token will be the default platform token.

Next, all hostRules with both a token or username/password and matchHost will be fetched, except for any github.com one from above.

Rules from this list are converted to environment variable directives if they match any of the following characteristics:

• No hostType is defined, or
• hostType is go, or
• hostType is a platform (github, gitlab, azure, etc.)

Major upgrades of dependencies

Major upgrades in Go are different from most other ecosystems, because both the version and module name need to be changed. It is very common that such upgrades require changes to application code, which Renovate doesn't do.

By default, Renovate will make such change in the go.mod files but nothing else - the rest is up to you. If you add gomodUpdateImportPaths to postUpdateOptions then Renovate will also use a third-party tool to migrate import paths within application code, but there may still be actual application logic which needs to be changed too.

Ultimately: it is known and unavoidable that the majority of major Go upgrades won't be immediately mergeable. You might prefer to configure such major updates with dependencyDashboardApproval=true so that you can request them on demand, on supported platforms.