# Terraform Versions

You can customize which version of Terraform Atlantis defaults to by setting the --default-tf-version flag (ex. --default-tf-version=v0.12.0).

# Via atlantis.yaml

If you wish to use a different version than the default for a specific repo or project, you need to create an atlantis.yaml file and set the terraform_version key:

version: 3
projects:
- dir: .
  terraform_version: v0.10.5

See atlantis.yaml Use Cases for more details.

# Via terraform config

Alternatively, one can use the terraform configuration block's required_version key to specify an exact version:

terraform {
  required_version = "0.12.0"
}

See Terraform required_version for reference.