Development open for Swift 6.4.1 for Non-Darwin Platforms

Development Announcements
1

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
  • Changes for Swift version 6.4.1 should be made on the release/6.4.1
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[🍒 6.4] LoopInvariantCodeMotion: don't hoist and sink `store [assign]` by clackary · Pull Request #91509 · swiftlang/swift · GitHub 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

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