Change cpython version

Questions / Help
1

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”

2

@LowellVCM this worked for me

[build]
  builder = "paketobuildpacks/builder:base"
  buildpack = ["paketo-buildpacks/python"]
[build.args]
  BP_CPYTHON_VERSION = "3.9.16"
3

How do you specify which builder version to use? I want to use Python 3.12.0 which is supported here: Releases · paketo-buildpacks/cpython · GitHub

However when I use flyctl deploy I’m seeing it’s using:
paketo-buildpacks/cpython 1.8.11
which only supports up to Python 3.11.4 and therefore I get the error:
failed to satisfy "python" dependency version constraint "3.11.5": no compatible versions on "io.buildpacks.stacks.bionic" stack. Supported versions are: [3.7.16, 3.7.16, 3.7.17, 3.7.17, 3.8.16, 3.8.16, 3.8.17, 3.8.17, 3.9.16, 3.9.16, 3.9.17, 3.9.17, 3.10.11, 3.10.11, 3.10.12, 3.10.12, 3.11.3, 3.11.3, 3.11.4, 3.11.4]

Is there a way to use v1.11.0 of the buildpack so that I can use up to Python 3.12.0?