Sourced from wasmtime's releases.

v46.0.0

46.0.0

Released 2026-06-22.

Added

• Added opt-in support for the WebAssembly branch-hinting proposal: the metadata.code.branch_hint custom section is parsed and used to mark cold blocks during Cranelift compilation, behind Config::wasm_branch_hinting (off by default). #13459

• Wasmtime's C API now supports type reflection of GC values. #13268

• Wasmtime now supports being compiled to arm64_32 platforms. #13259

• The cranelift-frontend crate,the RISC-V Cranelift backend, and Wasmtime's component-model-async feature now support no_std. #13401 #13479 #13533

• Wasmtime has initial support for the component model (implements "...") feature. #13361 #13497 #13513

• The wasmtime CLI now supports configuring the initial-cwd property of WASI. #13468

• The wasmtime serve subcommand now supports --header to set headers for the guest. #13471

• Wasmtime supports WASI 0.2.12, which notably includes exit-with-code in stable. #13536

• Wasmtime's component-model-async-bytes feature was renamed to component-model-bytes and now lifting/lowering using Bytes and BytesMut is directly supported. #13366

• Wasmtime now exposes the async call stack of components through its public API which can be used to determine which root task performed an import call.

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Sourced from wasmtime's changelog.

47.0.0

Unreleased.

Added

Changed

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Release notes for previous releases of Wasmtime can be found on the respective release branches of the Wasmtime repository.

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• 423be7a Release Wasmtime 46.0.0 (#13696)
• 4c582a2 Properly tag inline bulk-copy loads/stores with alias regions (#13610) (#13679)
• 559e3ca [46.0.0] More backports/bugfixes (#13668)
• 7535c02 Fix leak in fd_renumber (#13649)
• 60f0577 [46.0.0] Some more backports (#13626)
• 5d09d88 feat(MachO): Cranelift: align stack prologue/epilogue with compact unwind for...
• 22e179d [46.0.0] Two more backports (#13581)
• c12f1bc Fix subtraction order in poll_oneoff (#13566) (#13575)
• 903e292 Add release notes (#13573)
• ff639ef add monotonic clock "pause" feature to p1->p2 adapter (#13563)
• Additional commits viewable in compare view