Announcing Support of Swift 6 in The Hiero Swift SDK

Official Swift 6 Support is Here

The Hiero Swift SDK will be officially supporting Swift 6.0, 6.1, and 6.2 as of version v0.47.0 released February 2nd. This change is an investment in safety, performance, and long-term alignment with modern Swift tooling on Hiero.

Upgrading the Hiero Swift SDK to support Swift 6 keeps Hiero aligned with Apple’s current requirements, which state that apps uploaded to App Store Connect must be built with Xcode 16 or later as of April 24, 2025. This release is focused on compatibility, so the SDK integrates cleanly into modern Swift 6.x codebases. It also sets Hiero up for future work that can take advantage of Swift 6’s stronger concurrency model, including sendable annotations, actor isolation, and compiler checks that help surface race conditions at build time.

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Limited Support of Swift 5.x

As of v0.47.0, Swift 5.x is still compatible, however, with limited support. We’re providing a clear notice period from February 2, 2026 through August 3, 2026 after which Swift 5.x will no longer be supported.

• The minimum supported Swift version remains 5.6 until August 3, 2026.
• Teams already building on Swift 6.x do not need to take any action.
• Teams on Swift 5.x should plan to upgrade before August 3, 2026.

Support Table between February 2 and August 3, 2026

| Swift Version | CI Tested | Status | | :------------ | :-------: | :------ | | 6.2 | ✅ Yes | ✅ Officially Supported | | 6.1 | ✅ Yes | ✅ Officially Supported | | 6.0 | ✅ Yes | ✅ Officially Supported (recommended) | | 5.10 | ✅ Yes | 🟡 Limited (compatible but upgrade recommended) | | 5.9 | ✅ Yes | 🟡 Limited (compatible but upgrade recommended) | | 5.8 | ❌ No | 🟡 Limited (compatible but upgrade recommended) | | 5.7 | ❌ No | 🟡 Limited (compatible but upgrade recommended) | | 5.6 | ❌ No | 🟡 Limited (minimum requirement, but upgrade recommended) |

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Key Dates and Next Steps

February 2nd, 2026 - Support for Swift 6+ in the Hiero Swift SDK

• The SDK release v0.47.0 introduces official support for Swift 6.0 / 6.1 / 6.2.
• Swift 5.x is compatible with limited support.

August 3, 2026 onward - Swift Version 5.x No longer supported by the Hiero Swift SDK

• As of August 3rd 2026, the minimum version required by the Hiero Swift SDK will be Swift 6.0

Conclusion

If you are currently using the Hiero Swift SDK, please plan to upgrade to Swift 6.x before August 3, 2026.

If you have any questions or need guidance during this transition, please reach out on Hiero's Discord or other official community channels.