What's new

The releases that change how you write Swift — what arrived, what changed underneath you, what is deprecated, and what you actually need to migrate.

• swift▲high impact2025-09-15

  Swift 6.2 — approachable concurrency

  A direct response to how hard Swift 6's strict checking was to adopt. Most of this release is about letting single-threaded code stay single-threaded without fighting the compiler, so you opt into parallelism rather than out of it.

  • changed
  • new
  • changed
• swift▲high impact2024-09-16

  Swift 6.0 — data races become compile errors

  The release the whole concurrency model was built toward. In Swift 6 language mode, code that could race is rejected at compile time rather than crashing intermittently in production.

  • new
  • new
• iOS▲high impact2023-09-18

  iOS 17 — the Observation framework

  @Observable replaces ObservableObject for most SwiftUI state, and changes which views actually redraw.

  • new
  • deprecated
• swift•medium impact2023-09-18

  Swift 5.9 — macros and ownership

  Macros arrive as a first-class language feature, and the ownership model gains noncopyable types.

  • new
  • new
  • new