diff --git a/maintainers/scripts/update-python-libraries b/maintainers/scripts/update-python-libraries
index d56c9e6338cc..4a6024c40380 100755
--- a/maintainers/scripts/update-python-libraries
+++ b/maintainers/scripts/update-python-libraries
@@ -1,3 +1,5 @@
 #!/bin/sh
-exec nix-shell -p "python3.withPackages(ps: with ps; [ packaging requests toolz ])" -p git --run pkgs/development/interpreters/python/update-python-libraries/update-python-libraries.py
+build=`nix-build -E "with import (fetchTarball "channel:nixpkgs-unstable") {}; python3.withPackages(ps: with ps; [ packaging requests toolz ])"`
+python=${build}/bin/python
+exec ${python} pkgs/development/interpreters/python/update-python-libraries/update-python-libraries.py $@