How to update applications in an OBS environment

Hello, I recently encounter this issue where I need to build a Rust application for Leap15.3 using OBS, the problem is that I need a more recent version of Rust compiler in order to build it. Right now the version of rust compiler(rustc) in my local deployed OBS instance is too low (v1.43.1) and the most recent one is v1.56.1. And since I’m using local OBS server, I assume all I needed to do is somehow update the version using osc shell ? But I don’t know how to do that without a package manager, could someone give a hint?
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I am not sure I understand the question. OBS is just a framework, it does not include or provide Rust compiler. When you initiate build, OBS installs packages from repositories configured for a project. If you need newer version of Rust, just build it as part of your project and it will be picked up in preference to any external repository.