diff --git a/flake.nix b/flake.nix
index 310bf584..6b271d1b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -418,6 +418,7 @@
             skyflake.nixosModules.default
             ./hosts/hydra
           ];
+          nixos = inputs.nixos-23-05;
         };
 
         iso = nixosSystem' {