Wasmtime-py and randomness

I am using wasmtime-py to create a fully deterministic sandbox (for reproducible build purposes) for a toolchain. The toolchain uses `rand()` or similar for Monte Carlo method computations, which AFAICT requests randomness from wasmtime.

Is there a way to tell wasmtime to only produce deterministic randomness? Is that something I can do via wasmtime-py? What does it do by default?