The Bytecode Alliance is very happy to announce a significant milestone for both Wasmtime and the Bytecode Alliance: Wasmtime has officially been promoted to become the BA’s first Core Project. As someone deeply involved in Wasmtime and the proposal process, I’m incredibly excited to share this news and what it signifies.

Wasmtime is a lightweight WebAssembly runtime built for speed, security, and standards-compliance. Wasmtime now supports long-term-support (LTS) releases that are maintained with security fixes for 2 years after their initial release.

In 2024, the WAMR community saw many thrilling advancements, including the development of new features, increased industrial use, and an improved experience for developers. Passionate developers and industry professionals have come together to enhance and expand WAMR in ways we couldn’t have imagined. From exciting new tools to a growing community, there’s a lot to be proud of. Let’s take a closer look at the key highlights of WAMR 2024, showcasing the community’s efforts, new features, and the establishment of the Embedded Special Interest Group (ESIG).

Each December the Bytecode Alliance conducts elections to fill important roles on our governing Board and Technical Steering Committee (TSC). I’m pleased to announce the results of our just-held December 2024 election, in which our Recognized Contributors (RCs) selected three Elected Delegates to the TSC and one At-Large Director to represent them on the Alliance Board.

Wasmtime is a lightweight WebAssembly runtime built for speed, security, and standards-compliance. December’s v28.0 release brings enhancements including a new option for optimization at compile-time, a new first-class type for Cranelift’s domain-specific language (DSL), and more.

Portability is among the first properties promoted on WebAssembly’s official homepage:

This month’s v27.0 release of Wasmtime—the fast, secure, and standards-compliant WebAssembly (Wasm) runtime—includes enhancements such as completed support for the new Wasm garbage collection proposal, a PyTorch backend for wasi-nn, link-time feature gate configuration for unstable WIT APIs, and more.

Wasmtime is a fast, secure, and standards-compliant WebAssembly runtime. The latest v26.0 release includes enhancements such as implementation of the “table64” extension, a new wasmtime completion subcommand, ARM64 Windows support, and more.

Wasmtime is a lightweight WebAssembly runtime that is fast, secure, and standards-compliant. Today’s release of Wasmtime v25.0 brings enhancements including extended constants, WASI 0.2.1 support, and user stack maps.

As part of implementing the WebAssembly garbage collection proposal in Wasmtime, which is an ongoing process, we’ve overhauled the stack map infrastructure in Cranelift. This post will explain what stack maps are, why we needed to change them, and how the new stack maps work.