Version Attribute

version-attribute - Resolve registry modules from a version constraint

The version-attribute experiment has been added to gate a new version attribute on the terraform block. It holds a version constraint (such as ~> 3.3 or >= 1.0.0, < 2.0.0) for a tfr:// registry module, and Terragrunt resolves it to the highest published version that satisfies the constraint before downloading:

terraform {
  source  = "tfr://registry.opentofu.org/terraform-aws-modules/vpc/aws"
  version = "~> 3.3"
}

This brings the terraform block to parity with the version argument on OpenTofu and Terraform module blocks. The attribute applies to tfr:// sources only, and cannot be combined with an inline ?version= on the same source.

Enable it with --experiment version-attribute. For setup steps and the criteria for stabilization, see the experiment documentation.