Swift 6.3.3 toolchain released

Category: Apple
Status: confirmed
Sources: Swift install, GitHub release
Summary: Swift 6.3.3 was tagged on 2026-06-30 as the current stable toolchain, a patch update to the 6.3 line that follows 6.3.2 (2026-06-04). The release publishes updated toolchains for supported platforms and is what the default Swift install now serves. The GitHub release object carries no detailed changelog, and the repository CHANGELOG lists no language-level change specific to 6.3.3, consistent with a bug-fix toolchain patch.
Why it matters: 6.3.3 is the baseline toolchain for Swift and SwiftUI builds on the 6.3 line, so teams pinning toolchain versions should track the point bump.