# Release v0.12.21
NEW FEATURES:
* backend/cos: New backend \cos\, supporting using Tencent Cloud Storage as a remote backend.
* command/login: Enable \terraform login\ and add support for UI-generated tokens ([#23995](https://github.com/hashicorp/terraform/issues/23995))
* command/logout: Add \terraform logout\ command to remove local credentials ([#24048](https://github.com/hashicorp/terraform/issues/24048))

ENHANCEMENTS:

* command/workspace delete: release lock after workspace removal warning ([#24085](https://github.com/hashicorp/terraform/issues/24085))
* lang/funcs: add `setsubtract` function ([#23424](https://github.com/hashicorp/terraform/issues/23424))

BUG FIXES:
* command/state show: Fix an issue when a resource has a non-default provider configured ([#24027](https://github.com/hashicorp/terraform/issues/24027))
* backend/remote-state: Fix issues where lingering lock files remained when deleting non-empty workspaces ([#24085](https://github.com/hashicorp/terraform/issues/24085))
* command/import: Release lock if initialization error occurs on import ([#23318](https://github.com/hashicorp/terraform/issues/23318))
* terraform: Fix panic when using `for_each` with a set containing `null` values ([#24047](https://github.com/hashicorp/terraform/issues/24047))