Rust 1.91 promotes Windows on Arm64 to Tier 1 target

Rust 1.91 Released with Tier 1 Support for Windows on Arm64

The Rust Release Team has announced Rust 1.91, promoting Windows on Arm64 to a Tier 1 target, bringing the highest support guarantees to users of 64-bit Arm systems running Windows.

With this update, the aarch64-pc-windows-msvc target is now a Tier 1 supported target, ensuring the project's full test suite is run on those platforms for every change merged in the compiler.

Rust 1.91 was announced on October 30, and previous users can upgrade by running rustup update stable.

Author's summary: Rust 1.91 promotes Windows on Arm64 to Tier 1 target with highest support guarantees.

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InfoWorld InfoWorld — 2025-10-31

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