WebAssembly (Wasm) was built for the browser but has recently found a footing in the backend deployment space due to its focus on sandboxing, security, and performance. The WASI specification allows programming languages to support OS-level features like interacting with files and standard I/O, but this is only the beginning. In this Lightning Talk, we will look at Go 1.21’s WASI support and take a view towards the future of WASI.