Do I need to change anything for Swift 6.2?
Asked on 06/11/2025
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To prepare for Swift 6.2, there are several changes and improvements you might want to consider:
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Concurrency Improvements: Swift 6.2 introduces changes to make concurrency more approachable. These changes are opt-in and can be enabled under the Swift Compiler Concurrency section of Xcode Build Settings or in a Swift package manifest file using the Swift Settings API. Migration tooling is available to help make necessary code changes automatically. What’s new in Swift
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Data Race Safety: The new Swift 6 language mode enables compile-time data race safety. This mode is opt-in and can be adopted incrementally, one module at a time. It diagnoses concurrent access to memory, allowing you to fix data race safety errors with minimal code changes. Platforms State of the Union
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Strict Memory Safety: Swift 6.2 introduces a Strict Memory Safety mode, which requires explicit acknowledgment of unsafe API usage in source code. This mode is not enabled by default but can be turned on in Xcode's build settings. Safely mix C, C++, and Swift
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Performance Enhancements: Swift 6.2 includes performance improvements such as inline arrays and a new span type for safe, fast access to contiguous memory. These features can help optimize your code. Platforms State of the Union
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Library and Tooling Updates: Swift 6.2 modernizes more of Foundation's API surface and provides new APIs for everyday programming tasks. It also includes improvements to debugging asynchronous code and building Swift code. What’s new in Swift
If you are migrating to Swift 6.2, it is recommended to review these changes and consider enabling the new language modes and features to take full advantage of the improvements.
What’s new in Swift
Join us for an update on Swift. We’ll talk about workflow improvements that make you more productive, and new and modernized library APIs for fundamental programming tasks. We’ll show examples of Swift adoption throughout more layers of the software stack. Finally, we’ll explore new language features for both improving approachability of concurrency, and achieving peak performance when you need it.
Platforms State of the Union
Discover the newest advancements on Apple platforms.
Migrate your app to Swift 6
Experience Swift 6 migration in action as we update an existing sample app. Learn how to migrate incrementally, module by module, and how the compiler helps you identify code that’s at risk of data races. Discover different techniques for ensuring clear isolation boundaries and eliminating concurrent access to shared mutable state.