diff --git a/.woodpecker/drift.yaml b/.woodpecker/drift.yaml
index 15dae0f..45a4180 100644
--- a/.woodpecker/drift.yaml
+++ b/.woodpecker/drift.yaml
@@ -17,4 +17,4 @@ steps:
         from_secret: ci_drift_token
     commands:
       - echo "▸ arch=$(uname -m)"
-      - nix shell nixpkgs#python3 nixpkgs#python3Packages.pyyaml -c python3 drift_check.py
+      - "nix-shell -p 'python3.withPackages (ps: [ ps.pyyaml ])' --run 'python3 drift_check.py'"