Development open for Swift 6.3.1 for Linux and Windows

Development Announcements
1

We are happy to announce the opening of the development phase for Swift 6.3.1.

  • Merge window open: Now
  • Merge window close: April 10th 2026
  • Planned release: End of April 2026
  • Release manager: @mishal_shah (shahmishal on GitHub)
  • Process documentation
  • Changes for Swift version 6.3.1 should be made on the release/6.3.1 branch
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2

@ahoppen Will the high CPU usage by Sourcekit-LSP on Windows be fixed in 6.3.1? The fix was mentioned here: SourceKit-LSP CPU spinning and libdispatch complications - #26 by ahoppen

3

The fix to the spinning issue should be fixed in SourceKit-LSP bundled with Swift 6.4. It’s rewriting the entire stdin parsing logic, so it’s likely too risky to take for a patch release like 6.3.1.

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