terraform v1.17.0-alpha20260812

v1.17.0-alpha20260812Pre-release
Added 1
  • JSON output from terraform version now includes a new format_version field
Changed 1
  • Enrich log messages in terraform init with provider versions
Fixed 2
  • Fix pow and log functions to no longer panic when result is not a number
  • Terraform will now use and display diagnostics raised when renewing an ephemeral resource
1.17.0-alpha20260812 (August 12, 2026)

ENHANCEMENTS:

  • command/init: Enrich log messages with provider versions (#38918)

BUG FIXES:

  • funcs: pow and log no longer panic when result is not a number (#38912)

  • ephemeral: Terraform will now use and display diagnostics raised when renewing an ephemeral resource. This may cause warnings to appear that previously were lost. We expect that any error diagnostics that were previously lost would have caused confusing downstream errors, so we do not anticipate this change to be breaking. (#38989)

NOTES:

  • version: JSON output now includes a new format_version field, which will enable safer future changes of the command's JSON output format. It is assumed existing tooling ignores unknown fields and therefore this change should not be breaking in itself but we advice consumers to pay attention to format_version in future releases and/or use latest version of hashicorp/terraform-json & hashicorp/terraform-exec which does. (#38930)

EXPERIMENTS:

Experiments are only enabled in alpha releases of Terraform CLI. The following features are not yet available in stable releases.

  • The experimental "deferred actions" feature, enabled by passing the -allow-deferral option to terraform plan, permits count and for_each arguments in module, resource, and data blocks to have unknown values and allows providers to react more flexibly to unknown values.
  • terraform test cleanup: The experimental test cleanup command. In experimental builds of Terraform, a manifest file and state files for each failed cleanup operation during test operations are saved within the .terraform local directory. The test cleanup command will attempt to clean up the local state files left behind automatically, without requiring manual intervention.
  • terraform test: backend blocks and skip_cleanup attributes:
    • Test authors can now specify backend blocks within run blocks in Terraform Test files. Run blocks with backend blocks will load state from the specified backend instead of starting from empty state on every execution. This allows test authors to keep long-running test infrastructure alive between test operations, saving time during regular test operations.
    • Test authors can now specify skip_cleanup attributes within test files and within run blocks. The skip_cleanup attribute tells terraform test not to clean up state files produced by run blocks with this attribute set to true. The state files for affected run blocks will be written to disk within the .terraform directory, where they can then be cleaned up manually using the also experimental terraform test cleanup command.
  • terraform query: The experimental -policies flag permits specifying one or more policy set directory paths to evaluate policies against resources discovered by list blocks during a query operation.
Previous Releases

For information on prior major and minor releases, refer to their changelogs:

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