upd

modules/nixos/services/wyoming/default.nix

@@ -2,6 +2,7 @@
   config,
   lib,
   namespace,
+  pkgs,
   ...
 }:
 with lib;
@@ -22,10 +23,13 @@ in
         uri = "tcp://0.0.0.0:10300";
       };
 
-      piper.servers.hass-piper = {
-        enable = true;
-        voice = "en-us-ryan-high";
-        uri = "tcp://0.0.0.0:10200";
+      piper = {
+        package = pkgs.stable.wyoming-piper;
+        servers.hass-piper = {
+          enable = true;
+          voice = "en-us-ryan-high";
+          uri = "tcp://0.0.0.0:10200";
+        };
       };
     };
   };