diff --git a/flake.nix b/flake.nix
index 2a07d4b6..df03e2eb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -577,6 +577,7 @@
           modules = [
             ./hosts/pipebert
           ];
+          nixos = inputs.nixos-23-05;
         };
 
         prometheus = nixosSystem' {