* installing *source* package ‘rbm25’ ...
** package ‘rbm25’ successfully unpacked and MD5 sums checked
** using staged installation
Error: 
------------------ [UNSUPPORTED RUST VERSION]------------------
- Minimum supported Rust version is 1.71.1.
- Installed Rust version is 1.70.0.
---------------------------------------------------------------
Execution halted
ERROR: configuration failed for package ‘rbm25’
* removing ‘/Volumes/Builds/packages/big-sur-x86_64/results/4.3/rbm25.Rcheck/rbm25’