Solana: Rust Toolchains and how to update them

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Updating Rust Toolchains on Solana with Solana-Program Crate

While building native Rust programs for Solana using the „solana-program” crate (version 2.1.6), you may have encountered an issue when trying to update your toolchain. This article will walk you through the process of updating your Rust toolchain and troubleshooting the issue.

Why is my toolchain out of date?

Before we dive into the solution, let’s briefly discuss why your toolchain might be out of date:

  • The „solana-program” crate may not maintain compatibility with newer versions of Rust.
  • The Solana Rust ecosystem is updated from time to time, which can break dependency compatibility.

Updating Rust Toolchains on Solana

To update the Rust toolchain, follow these steps:

Solana: Rust Toolchains and how to update them

1. Update Rust to version 1.64 or later

First, make sure you are using a compatible version of „rustc”. If you are using an older version, upgrade to one that is supported by the „solana-program” bin.

rustup update --default-version nightly-2024 (or the target stable version)

2. Update the solana-program bin

Then, update the „solana-program” bin to a compatible version:

load update solana-program@v2.1.6

This command will update all dependencies of the „solana-program” bin.

3. Rebuild the program

Now that you have updated the Rust toolchain and the „solana-program” crate, rebuild your Solana program using:

load build-sbf

This will resolve any compatibility issues with the outdated toolchain.

Tips and Variations

  • If you are experiencing issues with certain dependencies, consider updating them before rebuilding your Rust codebase.
  • When updating a dependency, be sure to update all versions (e.g.1.63.xto2.0.x`) if necessary.
  • If you encounter additional bugs or compatibility issues after updating, try checking the [Solana Program Crate GitHub page] ( for the latest updates for known issues.

If you follow these steps, you should be able to update the Rust toolchain and resolve the error preventing the Solana program from compiling.

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