diff --git a/hosts.nix b/hosts.nix
index 2214fed..f5ee33c 100644
--- a/hosts.nix
+++ b/hosts.nix
@@ -106,6 +106,7 @@ in
       environment = "proxmox";
     };
     valkyrie = {
+      hostNixpkgs = nixpkgs-23-05;
       site = "af";
       environment = "openstack";
     };