diff --git a/nix/python.nix b/nix/python.nix
index 406e7aee5..160b4ee79 100644
--- a/nix/python.nix
+++ b/nix/python.nix
@@ -6,14 +6,68 @@
   uv2nix,
   pyproject-nix,
   pyproject-build-systems,
+  stdenv,
 }:
 let
   workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./..; };
+  hacks = callPackage pyproject-nix.build.hacks { };
 
   overlay = workspace.mkPyprojectOverlay {
     sourcePreference = "wheel";
   };
 
+  isAarch64Darwin = stdenv.hostPlatform.system == "aarch64-darwin";
+
+  # Keep the workspace locked through uv2nix, but supply the local voice stack
+  # from nixpkgs so wheel-only transitive artifacts do not break evaluation.
+  mkPrebuiltPassthru = dependencies: {
+    inherit dependencies;
+    optional-dependencies = { };
+    dependency-groups = { };
+  };
+
+  mkPrebuiltOverride = final: from: dependencies:
+    hacks.nixpkgsPrebuilt {
+      inherit from;
+      prev = {
+        nativeBuildInputs = [ final.pyprojectHook ];
+        passthru = mkPrebuiltPassthru dependencies;
+      };
+    };
+
+  pythonPackageOverrides = final: _prev:
+    if isAarch64Darwin then {
+      numpy = mkPrebuiltOverride final python311.pkgs.numpy { };
+
+      av = mkPrebuiltOverride final python311.pkgs.av { };
+
+      humanfriendly = mkPrebuiltOverride final python311.pkgs.humanfriendly { };
+
+      coloredlogs = mkPrebuiltOverride final python311.pkgs.coloredlogs {
+        humanfriendly = [ ];
+      };
+
+      onnxruntime = mkPrebuiltOverride final python311.pkgs.onnxruntime {
+        coloredlogs = [ ];
+        numpy = [ ];
+        packaging = [ ];
+      };
+
+      ctranslate2 = mkPrebuiltOverride final python311.pkgs.ctranslate2 {
+        numpy = [ ];
+        pyyaml = [ ];
+      };
+
+      faster-whisper = mkPrebuiltOverride final python311.pkgs.faster-whisper {
+        av = [ ];
+        ctranslate2 = [ ];
+        huggingface-hub = [ ];
+        onnxruntime = [ ];
+        tokenizers = [ ];
+        tqdm = [ ];
+      };
+    } else {};
+
   pythonSet =
     (callPackage pyproject-nix.build.packages {
       python = python311;
@@ -21,6 +75,7 @@ let
       (lib.composeManyExtensions [
         pyproject-build-systems.overlays.default
         overlay
+        pythonPackageOverrides
       ]);
 in
 pythonSet.mkVirtualEnv "hermes-agent-env" {