Automated Dependency Updates for Terragrunt

Categories: iac, terraform

Renovate supports updating Terragrunt dependencies.

File Matching¶

By default, Renovate will check any files matching the following regular expression: /(^|/)terragrunt\.hcl$/.

For details on how to extend a manager's managerFilePatterns value, please follow this link.

Supported datasources¶

This manager supports extracting the following datasources: git-tags, github-tags, gitlab-tags, bitbucket-tags, gitea-tags, terraform-module.

Default config¶

{
  "commitMessageTopic": "Terragrunt dependency {{depName}}",
  "managerFilePatterns": [
    "/(^|/)terragrunt\\.hcl$/"
  ]
}

Additional Information¶

Currently by default, Terragrunt support is limited to Terraform registry sources and GitHub sources that include SemVer refs, e.g. like github.com/hashicorp/example?ref=v1.0.0.

You can create a custom versioning config to support non-SemVer references. For example, if you want to reference a tag like module-v1.2.5, a block like this would work:

{
  "terragrunt": {
    "versioning": "regex:^((?<compatibility>.*)-v|v*)(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)$"
  }
}

Pinned Terragrunt dependencies like the following will get a PR whenever there is a newer version available:

terraform {
  source = "github.com/hashicorp/example?ref=v1.0.0"
}

Terraform lockfiles¶

The Terragrunt manager supports lock file maintenance for .terraform.lock.hcl artifacts. These artifacts will be updated if and only if the update type is lockFileMaintenance.

Open items¶

The below list of features were current when this page was generated on December 30, 2025.

Feature requests¶

Support updating Terragrunt-generated terraform.lock.hcl lock files #13393