diff --git a/flake.nix b/flake.nix
index fc9d45fb..69d21e26 100644
--- a/flake.nix
+++ b/flake.nix
@@ -378,6 +378,7 @@
             self.nixosModules.microvm
             ./hosts/gitea
           ];
+          nixos = inputs.nixos-23-05;
         };
 
         glotzbert = nixosSystem' {