## 1.15.2 (May 6, 2026)


ENHANCEMENTS:

* stacks: add ouput values to plan component instance change description ([#38360](https://github.com/hashicorp/terraform/issues/38360))


BUG FIXES:

* Avoid printing warnings from 'terraform output -json' ([#38530](https://github.com/hashicorp/terraform/issues/38530))


## 1.15.1 (May 1, 2026)


BUG FIXES:

* Fixed crash when configuration has an invalid `action_trigger` nested block in `data` or `ephemeral` lifecycle blocks ([#38402](https://github.com/hashicorp/terraform/issues/38402))

* validate: Removed validation of attributes inside `backend` blocks due to incompatibility with workflows using the `-backend-config` flag. ([#38466](https://github.com/hashicorp/terraform/issues/38466))

* Fix non-const variable checks on `init` ([#38470](https://github.com/hashicorp/terraform/issues/38470))

* Avoid warnings in 'terraform output -raw' ([#38487](https://github.com/hashicorp/terraform/issues/38487))

* Ignore undeclared variable values from the cloud backend ([#38490](https://github.com/hashicorp/terraform/issues/38490))

* Fix panic for types modules with no expanded instances ([#38491](https://github.com/hashicorp/terraform/issues/38491))

* Fixed "unknown provider function" errors occurring during init ([#38472](https://github.com/hashicorp/terraform/issues/38472))

* init: Fixed a bug that impacted use of provider pre-releases during init ([#38496](https://github.com/hashicorp/terraform/issues/38496))


## 1.15.0 (April 29, 2026)


NEW FEATURES:

* We now produce builds for Windows ARM64 ([#32719](https://github.com/hashicorp/terraform/issues/32719))

* You can set a `deprecated` attribute on variable and output blocks to indicate that they are deprecated. This will produce warnings when passing in a value for a deprecated variable or when referencing a deprecated output. ([#38001](https://github.com/hashicorp/terraform/issues/38001))

* backend/s3: Support authentication via `aws login` ([#37976](https://github.com/hashicorp/terraform/issues/37976))

* validate: The validate command now checks the `backend` block. This ensures the backend type exists, that all required attributes are present, and that the backend's own validation logic passes. ([#38021](https://github.com/hashicorp/terraform/issues/38021))

* `convert` function, which allows for precise inline type conversions ([#38160](https://github.com/hashicorp/terraform/issues/38160))

* Terraform now supports variables and locals in module source and version attributes ([#38217](https://github.com/hashicorp/terraform/issues/38217))


ENHANCEMENTS:

* config: `output` blocks now can have an explicit type constraints ([#36411](https://github.com/hashicorp/terraform/issues/36411))

* ssh-based provisioner (file + remote-exec): Re-enable support for PowerShell ([#37794](https://github.com/hashicorp/terraform/issues/37794))

* terraform init log timestamps include millisecond precision ([#37818](https://github.com/hashicorp/terraform/issues/37818))

* init: skip dependencies declared in development override. This allows you to use `terraform init` with developer overrides and install dependencies that are not declared in the override file. ([#37884](https://github.com/hashicorp/terraform/issues/37884))

* Terraform Test: Allow functions within mock blocks ([#34672](https://github.com/hashicorp/terraform/issues/34672))

* improve detection of deprecated resource attributes / blocks ([#38077](https://github.com/hashicorp/terraform/issues/38077))

* Deprecation messages providers set on resources / blocks / attributes are now part of the deprecation warning ([#38135](https://github.com/hashicorp/terraform/issues/38135))

* Include which attribute paths are marked as sensitive in list_start JSON logs ([#38197](https://github.com/hashicorp/terraform/issues/38197))

* Add input variable validation for Stacks ([#38240](https://github.com/hashicorp/terraform/issues/38240))

* When comparing a container value to null, only top level marks are now considered for the result. ([#38270](https://github.com/hashicorp/terraform/issues/38270))

* As part of supporting variables in module sources, most commands now accept variable values ([#38276](https://github.com/hashicorp/terraform/issues/38276))


BUG FIXES:

* testing: File-level error diagnostics are now included in JUnit XML skipped test elements, ensuring CI/CD pipelines can detect validation failures ([#37801](https://github.com/hashicorp/terraform/issues/37801))

* A refresh-only plan could result in a non-zero exit code with no changes ([#37406](https://github.com/hashicorp/terraform/issues/37406))

* cli: Fixed crash in `terraform show -json` when plan contains ephemeral resources with preconditions or postconditions ([#37834](https://github.com/hashicorp/terraform/issues/37834))

* cli: Fixed `terraform init -json` to properly format all backend configuration messages as JSON instead of plain text ([#37911](https://github.com/hashicorp/terraform/issues/37911))

* `state show`: The `state show` command will now explicitly fail and return code 1 when it fails to render the named resources state ([#37933](https://github.com/hashicorp/terraform/issues/37933))

* apply: Terraform will raise an explicit error if a plan file intended for one workspace is applied against another workspace ([#37954](https://github.com/hashicorp/terraform/issues/37954))

* lifecycle: `replace_triggered_by` now reports an error when given an invalid attribute reference that does not exist in the target resource ([#36740](https://github.com/hashicorp/terraform/issues/36740))

* backend: Fix nil pointer dereference crash during `terraform init` when the destination backend returns an error ([#38027](https://github.com/hashicorp/terraform/issues/38027))

* stacks: send progress events if the plan fails for better UI integration ([#38039](https://github.com/hashicorp/terraform/issues/38039))

* stacks: component instances should report no-op plan/apply. This solves a UI inconsistency with convergence destroy plans  ([#38049](https://github.com/hashicorp/terraform/issues/38049))

* backend/http: Return conflicting lock info from HTTP backend instead of the lock that failed to be taken ([#38144](https://github.com/hashicorp/terraform/issues/38144))

* states: fixed a bug that caused Terraform to be unable to identify when two states had different output values. This may have caused issues in specific circumstances like backend migrations. ([#38181](https://github.com/hashicorp/terraform/issues/38181))

* cloud: terraform cloud and registry discovery network requests are now more resilient, making temporary network or service related errors less common ([#38064](https://github.com/hashicorp/terraform/issues/38064))

* Enable formatting of `.tfquery.hcl` files by `terraform fmt` ([#38398](https://github.com/hashicorp/terraform/issues/38398))

* Fix `validate` not returning JSON for some early diagnostics ([#38400](https://github.com/hashicorp/terraform/issues/38400))

* Fix Terraform Stacks plugin installation error ([#38406](https://github.com/hashicorp/terraform/issues/38406))


NOTES:

* command/init: Provider installation was refactored to enable future enhancements in the area. This results in different order of operations during init and 2 new log messages replacing one (`initializing_provider_plugin_message`). The change should not have any end-user impact aside from the `init` command output. ([#38227](https://github.com/hashicorp/terraform/issues/38227))


UPGRADE NOTES:

* backend/s3: The `AWS_USE_FIPS_ENDPOINT` and `AWS_USE_DUALSTACK_ENDPOINT` environment variables now only respect `true` or `false` values, aligning with the AWS SDK for Go. This replaces the previous behavior which treated any non-empty value as `true`. ([#37601](https://github.com/hashicorp/terraform/issues/37601))


## Previous Releases

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

- [v1.14](https://github.com/hashicorp/terraform/blob/v1.14/CHANGELOG.md)
- [v1.13](https://github.com/hashicorp/terraform/blob/v1.13/CHANGELOG.md)
- [v1.12](https://github.com/hashicorp/terraform/blob/v1.12/CHANGELOG.md)
- [v1.11](https://github.com/hashicorp/terraform/blob/v1.11/CHANGELOG.md)
- [v1.10](https://github.com/hashicorp/terraform/blob/v1.10/CHANGELOG.md)
- [v1.9](https://github.com/hashicorp/terraform/blob/v1.9/CHANGELOG.md)
- [v1.8](https://github.com/hashicorp/terraform/blob/v1.8/CHANGELOG.md)
- [v1.7](https://github.com/hashicorp/terraform/blob/v1.7/CHANGELOG.md)
- [v1.6](https://github.com/hashicorp/terraform/blob/v1.6/CHANGELOG.md)
- [v1.5](https://github.com/hashicorp/terraform/blob/v1.5/CHANGELOG.md)
- [v1.4](https://github.com/hashicorp/terraform/blob/v1.4/CHANGELOG.md)
- [v1.3](https://github.com/hashicorp/terraform/blob/v1.3/CHANGELOG.md)
- [v1.2](https://github.com/hashicorp/terraform/blob/v1.2/CHANGELOG.md)
- [v1.1](https://github.com/hashicorp/terraform/blob/v1.1/CHANGELOG.md)
- [v1.0](https://github.com/hashicorp/terraform/blob/v1.0/CHANGELOG.md)
- [v0.15](https://github.com/hashicorp/terraform/blob/v0.15/CHANGELOG.md)
- [v0.14](https://github.com/hashicorp/terraform/blob/v0.14/CHANGELOG.md)
- [v0.13](https://github.com/hashicorp/terraform/blob/v0.13/CHANGELOG.md)
- [v0.12](https://github.com/hashicorp/terraform/blob/v0.12/CHANGELOG.md)
- [v0.11 and earlier](https://github.com/hashicorp/terraform/blob/v0.11/CHANGELOG.md)
