How do I force rustaceanvim to use the latest version of rust-analyzer? It's failing on a newer proc-macro server version.

[IceSentry]

Checked other resources

• This is not a bug report or feature request (Please use issues for those).
• This is a question about rustaceanvim, not rust-analyzer or Neovim.
• This is not a question about autocompletion.
• I have read the README.
• I have read the FAQ.
• I have searched for a solution using :h rustaceanvim.
• I have searched existing discussions.
• I have searched the existing issues/discussions of other plugins related to this question (if applicable).
• I have searched the existing rust-analyzer discussions (if applicable).
• I have added a very descriptive title to this question.

Description

I recently updated to rust 1.89 and now all my proc macros are failing saying the proc macro server is newer than my version of rust-analyzer. I thought this plugin would use the RA from rustup. I tried looking around and I didn't find anywhere to configure this. I feel like I must be using the wrong terms though because I assume it's a common issue to have.

I'm using a pretty basic LazyVim setup and I used the rustaceanvim config from the LazyVim extras. If that's the reason I'm having this issue I think I'll just finally have to make my own config.

Here's the full error message

Failed to run proc-macro server from path C:\Users\<User>\.rustup\toolchains\stable-x86_64-pc-windows-msvc\libexec\rust-analyzer-proc-macro-srv.exe, error: Custom { kind: Other, error: "The version of the proc-macro server (6) in your Rust toolchain is newer than the version supported by your rust-analyzer (5).\n            This will prevent proc-macro expansion from working. Please consider updating your rust-analyzer to ensure compatibility with your current toolchain." } rust-analyzer (macro-error) [94, 1]

My local rust-analyzer version has been updated with rustup but rustaceanvim hasn't picked it up apparently. I also tried fully restarting my computer and it still didn't work.

Example Code

// Not applicable. The issue is not related to a piece of code

Neovim version (nvim -v)

v0.11.3

Operating system/version

Windows 11

Output of :checkhealth rustaceanvim

==============================================================================
rustaceanvim:                                                             1 ⚠️

Checking for Lua dependencies ~
- ⚠️ WARNING optional dependency nvim-dap is configured, but not installed. Needed for debugging features [mfussenegger/nvim-dap](https://github.com/mfussenegger/nvim-dap)

Checking external dependencies ~
- ✅ OK rust-analyzer: found rust-analyzer 0.3.2337-standalone (5e7dd31c80 2025-03-09)
- ✅ OK Cargo: found cargo 1.89.0 (c24e10642 2025-06-23)
- ✅ OK rustc: found rustc 1.89.0 (29483883e 2025-08-04)
- ✅ OK debug adapter: found codelldb 

Checking config ~
- ✅ OK No errors found in config.

Checking for conflicting plugins ~
- ✅ OK No conflicting plugins detected.

Checking for tree-sitter parser ~
- ✅ OK tree-sitter parser for Rust detected.
- ✅ OK .vscode/settings.json loaded without errors.

[mrcjkb]

Hey 👋

rustaceanvim picks up rust-analyzer from your PATH. If you have multiple versions of rust-analyzer installed, you can either uninstall the old version or use :h rustaceanvim.config to set the path to the rust-analyzer executable manually.

[IceSentry]

Hey, sorry for never replying. I finally figured out the issue. LazyVim was using mason to manage rust-analyzer and overwrote the default config to use mason instead of the rust-analyzer from rustup. I didn't know it was doing that but now it works.