diff --git a/clusters/nixos-21.11.nix b/clusters/nixos-21.11.nix
new file mode 100644
index 0000000..96282d2
--- /dev/null
+++ b/clusters/nixos-21.11.nix
@@ -0,0 +1,5 @@
+import (builtins.fetchTarball {
+  url = "https://github.com/NixOS/nixpkgs/archive/573603b7fdb9feb0eb8efc16ee18a015c667ab1b.tar.gz";
+  sha256 = "1aa3wshxys9wrb4n0kxp3glvz06mv078kwl6m3v79cyr4gvmjh9q";
+})
+