diff --git a/nix/python.nix b/nix/python.nix
index 0bcd017e76d..16d8eaedad6 100644
--- a/nix/python.nix
+++ b/nix/python.nix
@@ -7,6 +7,7 @@
   pyproject-nix,
   pyproject-build-systems,
   stdenv,
+  dependency-groups ? [ "all" ],
 }:
 let
   workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./..; };
@@ -96,5 +97,5 @@ let
       ]);
 in
 pythonSet.mkVirtualEnv "hermes-agent-env" {
-  hermes-agent = [ "all" ];
+  hermes-agent = dependency-groups;
 }