diff --git a/nixos/pkgs/privatestorage/default.nix b/nixos/pkgs/privatestorage/default.nix
index ba856fb856477852c6679fff30bad720f59c6d57..e152f021cf5d6409d7b0f05582d28a44ccb87641 100644
--- a/nixos/pkgs/privatestorage/default.nix
+++ b/nixos/pkgs/privatestorage/default.nix
@@ -4,7 +4,7 @@ let
   repo = fetchFromGitHub (builtins.removeAttrs repo-data [ "branch" ]);
   zk = import repo;
   # XXX package version choice here
-  zkapauthorizer = zk.outputs.packages.x86_64-linux.zkapauthorizer-python310-tahoe_1_17_1;
+  zkapauthorizer = zk.outputs.packages.x86_64-linux.zkapauthorizer-python39-tahoe_1_17_1;
   python = zkapauthorizer.passthru.python;
 in
   python.withPackages (ps: [ zkapauthorizer ] )