diff --git a/users/sterni/exercises/aoc/2021/default.nix b/users/sterni/exercises/aoc/2021/default.nix
new file mode 100644
index 000000000..33d3a92ac
--- /dev/null
+++ b/users/sterni/exercises/aoc/2021/default.nix
@@ -0,0 +1,10 @@
+{ depot ? import ../../../../.. {}
+, pkgs ? depot.third_party.nixpkgs
+, ...
+}:
+
+pkgs.mkShell {
+  nativeBuildInputs = [
+    pkgs.cbqn
+  ];
+}