diff --git a/echidna.nix b/echidna.nix
index 5f1f3ec..69f25e2 100644
--- a/echidna.nix
+++ b/echidna.nix
@@ -4,6 +4,9 @@ let
   choose-pass =
     pkgs.callPackage ./macos/choose-pass.nix { inherit config pkgs; };
 in {
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
 
   # List packages installed in system profile. To search by name, run:
   # $ nix-env -qaP | grep wget