OpenTofu 1.13: What's New and What Terraform Still Doesn't Have
Originally published on DevToolHub . OpenTofu 1.13.0 shipped on September 30, 2026. Officially-supported Windows on ARM64, a set of new functions, and upgrades to the state-encryption system it shipped ahead of Terraform. Here's what actually changed, verified against the official release changelog, plus a close look at state encryption itself — still the single biggest feature gap between…
On September 30, 2026, OpenTofu 1.13.0 officially launched, bringing several new features and improvements. The update adds official support for Windows on ARM64, a new convert function for type conversion, and a set of functions with an assume prefix that provide hints about expected results. OpenTofu 1.13 also introduces linting support via an experimental -lint flag and symbol libraries as an experimental capability.
Unicode 17 is now supported for all string processing. Additionally, plan files now include provider schemas, enhancing plan readability outside the CLI. However, several changes may break existing configurations, such as the removal of the winrm provisioner connection type and changes to base64gzip output. macOS 13 Ventura is now the minimum supported version, and 32-bit CPU builds are no longer supported.
OpenTofu's state and plan encryption remains a significant differentiator compared to Terraform, which relies on backend-level encryption. The upgrade process is relatively straightforward for most users, especially those not using WinRM provisioners or running on older macOS versions.
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