diff --git a/flake.nix b/flake.nix
index 0cc7399e..3b89e709 100644
--- a/flake.nix
+++ b/flake.nix
@@ -307,6 +307,7 @@
             buzzrelay.nixosModules.default
             ./hosts/buzzrelay
           ];
+          nixos = inputs.nixos-23-05;
         };
 
         c3d2-web = nixosSystem' {