- Scrypto (v1.3.1) was released earlier today to allow building with Rust compilers newer than 1.81.0.
- The update resolves a compatibility issue between newer WebAssembly output and the Radix Engine by rebuilding Rust’s standard library during package builds.
- The new build process enforces a WASM MVP instruction set (WASM = WebAssembly; MVP = minimal stable feature set) to strip newer WASM instructions that the engine rejects.
- The release has been tested with Rust up to 1.92.0 and restores access to modern tooling, lints, and IDE improvements.
- The team plans to update the Radix Engine Toolkit soon; dependency guidance and full release notes are available here and here.
A new version of Scrypto, Scrypto (v1.3.1), went live earlier today. The release lets developers build Scrypto packages with Rust compilers newer than 1.81.0 by changing the package build pipeline to address WASM compatibility with the Radix Engine.
The update was tested with Rust compilers up to 1.92.0 and restores access to newer language features and tooling. The change aligns with the project’s broader 2026 Strategy goal of keeping the developer stack current and minimizing maintenance friction.
The core problem was that newer Rust releases produce WebAssembly (WASM) instructions from modern WASM proposals; the Radix Engine rejects those instructions to preserve determinism and on-Ledger security. WASM is a portable, low-level bytecode format for running code in web and blockchain environments; the engine requires a stable, minimal instruction set to ensure predictable execution.
The fix rebuilds the Rust standard library (“std”) during package builds and instructs the compiler to use a WASM MVP feature set. Rebuilding std means creating a version of the standard library that targets the older, allowed WASM instruction set while keeping the package logic intact.
Developers now regain upgrade freedom, better tooling (Clippy lints, formatting, IDE improvements), and easier use of third-party no_std crates that raised their minimum supported Rust version. The announcement says the team will update the Radix Engine Toolkit soon to support this Scrypto version.
For dependency guidance see the matrix here. Full release notes for this version are available here.
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