# Development open for Swift 6.4.1 for Non-Darwin Platforms

**URL:** <https://forums.swift.org/t/development-open-for-swift-6-4-1-for-non-darwin-platforms/89684>\
**Category:** Announcements\
**Created:** [September 21, 2026, 4:41pm UTC](https://forums.swift.org/t/development-open-for-swift-6-4-1-for-non-darwin-platforms/89684 "2026-09-21T16:41:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mishal\_shah](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/mishal_shah/32/247_2.png) [@mishal\_shah](https://forums.swift.org/u/mishal_shah)\
**Post date:** [September 21, 2026, 4:41pm UTC](https://forums.swift.org/t/development-open-for-swift-6-4-1-for-non-darwin-platforms/89684/1 "2026-09-21T16:41:52Z")

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We are happy to announce the opening of the development phase for Swift 6.4.1.

- Merge window open: Now
- Merge window close: September 30, 2026
- Planned release: Beginning of October 2026
- Release manager: @mishal_shah (shahmishal on GitHub)
- [Process documentation](https://www.swift.org/documentation/monthly-non-darwin-release/)
- Changes for Swift version 6.4.1 should be made on the `release/6.4.1`

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**Author:** ![taylorswift](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/taylorswift/32/43413_2.png) [@taylorswift](https://forums.swift.org/u/taylorswift)\
**Post date:** [September 21, 2026, 8:32pm UTC](https://forums.swift.org/t/development-open-for-swift-6-4-1-for-non-darwin-platforms/89684/2 "2026-09-21T20:32:27Z")

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[[🍒 6.4] LoopInvariantCodeMotion: don't hoist and sink `store [assign]` by clackary · Pull Request #91509 · swiftlang/swift · GitHub](https://github.com/swiftlang/swift/pull/91509) should be cherry-picked into 6.4.1

without it, there is a known miscompile with `OrderedDictionary.values` from swift-collections. details in the linked GitHub PR