Change cpython version

Is there any way to change the python version used by the buildpacks? I saw on the paketo buildpack documentation a possible way, but it does seem to work in my fly.toml file. It is posted below:

[build]
builder = “paketobuildpacks/builder:base”
[[build.env]]
name = “BP_CPYTHON_VERSION”
value = “3.9.14”

@LowellVCM this worked for me

[build]
  builder = "paketobuildpacks/builder:base"
  buildpack = ["paketo-buildpacks/python"]
[build.args]
  BP_CPYTHON_VERSION = "3.9.16"