diff --git a/flake.nix b/flake.nix
index c6943ab..ddfac9a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,6 +39,7 @@
 						findutils
 						jq
 						packer
+						pup
 						shellcheck
 						pkgs.dockerTools.usrBinEnv
 						(xonsh.overridePythonAttrs (old: rec { python3 = basicPython; propagatedBuildInputs = old.propagatedBuildInputs ++ [ basicPython.pkgs.pyyaml ];}))