The v1.13.x release series is supported until **August 1 2027**.

## 1.13.0 (Unreleased)

UPGRADE NOTES:

- The "winrm" connection type for provisioners is no longer supported. ([#4012](https://github.com/opentofu/opentofu/pull/4012))

    This connection type was deprecated in OpenTofu v1.12, and now removed in v1.13. Some of the upstream libraries OpenTofu was using to implement these features are no longer maintained, so it's not viable for us to offer this anymore.

    [Modern Windows versions now support OpenSSH](https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse), and so we suggest that anyone currently relying on WinRM plan to migrate to using SSH instead.

- OpenTofu v1.13 is the final release series that will include official builds for 32-bit CPU architectures (`*_386` and `*_arm` platforms).

    If you are currently relying on our official releases of OpenTofu on one of these platforms then we suggest that you begin planning to migrate to running OpenTofu on a 64-bit CPU architecture (`*_amd64` or `*_arm64` platforms) before the v1.13 series reaches end-of-life.

    Third parties may continue to offer their own OpenTofu builds targeting platforms that we don't officially support. This only affects the official packages published directly by the OpenTofu project in this repository's release artifacts.

- There are various minor changes to the robustness of file format and wire format parsers in the SSH client implementation used for remote provisioners.

    This may cause certain invalid input that was previously accepted to now be rejected, in an attempt to better match the expectations of other implementations of these protocols and formats.

ENHANCEMENTS:

- Windows on ARM64 is now an officially-supported platform for OpenTofu itself, though this new platform may not be supported by all available provider plugins. ([#4450](https://github.com/opentofu/opentofu/pull/4450))
- The `gcp_kms` key provider now supports an optional `additional_authenticated_data` as part of the encryption and decryption operations. ([#4287](https://github.com/opentofu/opentofu/pull/4287))
- The AWS KMS key provider for state encryption now supports an `encryption_context` field, allowing key-value string pairs to be passed to AWS KMS with every `GenerateDataKey` and `Decrypt` call. ([#4298](https://github.com/opentofu/opentofu/pull/4298))
- The `cidrsubnets` function now supports prefix extensions greater than 32 bits when the base CIDR block uses an IPv6 address. ([#4042](https://github.com/opentofu/opentofu/pull/4042))
- The `local-exec` provisioner now automatically sets the `TRACEPARENT` environment variable in child processes when OpenTelemetry tracing is active, following the W3C Trace Context specification. ([#4014](https://github.com/opentofu/opentofu/issues/4014))
- When OpenTelemetry trace collection is active, OpenTofu now copies any log lines generated by the OpenTelemetry libraries into its own debug log stream that you can activate using the `TF_LOG` environment variable. ([#4285](https://github.com/opentofu/opentofu/issues/4285))
- When installing provider and module packages from OCI Distribution registries, OpenTofu now tracks separate transient credentials for each repository to support registry implementations that issue repository-scoped tokens.  ([#3316](https://github.com/opentofu/opentofu/issues/3316))
- The `providers lock` command now supports the argument `-oci-mirror`. The functionality mimics that of the field `repository_template` of `oci_mirror`-block in [`provider_installation`](https://opentofu.org/docs/cli/config/config-file/#provider-installation) with the exception of using a URI template instead of a HCL one.
- The OpenBao key provider accepts a new `associated_data` (known as AAD) argument, allowing a base64-encoded value to be passed to OpenBao on every data key generation and decryption call. ([#4365](https://github.com/opentofu/opentofu/pull/4365))
- `tofu plan` no longer prints the explanatory paragraph that followed the "No changes. Your infrastructure matches the configuration." message, since it only restated that message in more words. ([#4340](https://github.com/opentofu/opentofu/issues/4340))
- On Windows systems, OpenTofu uses a heuristic to detect when it seems to be running in a legacy terminal emulator that uses a named pipe instead of a true pseudoterminal, such as with Cygwin and MSYS. This heuristic is now updated to be more reliable on recent versions of Windows that report slightly different names for those pipes. ([#4459](https://github.com/opentofu/opentofu/issues/4459))
- `tofu init` in our official releases when running on a 32-bit CPU architecture now warns about our plan to stop publishing official builds for these platforms starting in OpenTofu v1.14. ([#4018](https://github.com/opentofu/opentofu/issues/4018))

BUG FIXES:

- `tofu workspace new` now includes a hint to use `tofu workspace select` when the given workspace name already exists, instead of just reporting that it already exists. ([#4428](https://github.com/opentofu/opentofu/issues/4428))
- `tofu apply -json` now emits periodic `apply_progress` heartbeat messages for the full duration of a resource operation, instead of stopping after the first one. ([#4107](https://github.com/opentofu/opentofu/pull/4318))
- The built-in function `contains` now accepts `null` as its second argument, to test whether a collection contains any null values. ([#4043](https://github.com/opentofu/opentofu/issues/4043))
- The built-in function `merge` no longer fails when its only argument is a null value of an object type. ([#4043](https://github.com/opentofu/opentofu/issues/4043))
- The built-in function `cidrhost` no longer returns a "panic" error when called with an out-of-range host number represented in more than 64 bits. ([#4056](https://github.com/opentofu/opentofu/pull/4056))
- provisioner output is no longer suppressed when `-show-sensitive` is passed. ([#3927](https://github.com/opentofu/opentofu/issues/3927))
- In the `azurerm` backend's OpenID Connect authorization method, when `audience` is provided as a query parameter in the URL, it will be passed through instead of being overwritten by a default value. ([#4037](https://github.com/opentofu/opentofu/pull/4037))
- Using `-backend=false` during `tofu init` now skips reading the local encrypted state ([#4077](https://github.com/opentofu/opentofu/pull/4077))
- Fixed span error status not being set on module fetch failure path during `tofu init`, so observability tools now correctly identify failed spans. ([#4169](https://github.com/opentofu/opentofu/issues/4169))
- Fixed TRACESTATE log message incorrectly printing the TRACEPARENT value instead. ([#4168](https://github.com/opentofu/opentofu/issues/4168))
- Fix rendering of plans where a nested block's replacement is unknown. ([#4256](https://github.com/opentofu/opentofu/issues/4256))
- `errored.tfstate` is now produced during a go runtime panic. This file will be a partial state and is intended for aiding in recovery from a hard crash. ([#4064](https://github.com/opentofu/opentofu/pull/4064))
- `removed` blocks with an invalid `from` address and a destroy provisioner now report a configuration error instead of crashing. ([#4321](https://github.com/opentofu/opentofu/pull/4321))
- `tofu plan -out` no longer fails when the plan includes a resource with `lifecycle { destroy = false }` that needs replacement, which previously errored with `invalid change action ForgetThenCreate`. ([#4324](https://github.com/opentofu/opentofu/issues/4324))
- `connection.script_path` is escaped correctly not allowing anymore additional commands to be executed on the remote host together with the script path indicated by the argument. ([#4330](https://github.com/opentofu/opentofu/pull/4330))
- `tofu plan`: Fixed Incorrect warnings produced during plan -replace ([#4368](https://github.com/opentofu/opentofu/issues/4368))

## Previous Releases

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

- [v1.12](https://github.com/opentofu/opentofu/blob/v1.12/CHANGELOG.md)
- [v1.11](https://github.com/opentofu/opentofu/blob/v1.11/CHANGELOG.md)
- [v1.10](https://github.com/opentofu/opentofu/blob/v1.10/CHANGELOG.md)
- [v1.9](https://github.com/opentofu/opentofu/blob/v1.9/CHANGELOG.md)
- [v1.8](https://github.com/opentofu/opentofu/blob/v1.8/CHANGELOG.md)
- [v1.7](https://github.com/opentofu/opentofu/blob/v1.7/CHANGELOG.md)
- [v1.6](https://github.com/opentofu/opentofu/blob/v1.6/CHANGELOG.md)
