diff --git a/flake.nix b/flake.nix
index 6bdeaf7..9a0bddc 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,7 +14,11 @@
       in
       {
         devShells.default = pkgs.mkShellNoCC {
-          buildInputs = [ zig pkgs.zls ];
+          buildInputs = [
+            pkgs.aoc-cli
+            zig
+            pkgs.zls
+          ];
         };
 
         packages.default = pkgs.stdenv.mkDerivation {