diff --git a/flake.nix b/flake.nix
index 3bd0285..815061f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,7 +18,7 @@
       in
       {
         devShells.default = pkgs.mkShell {
-          packages = with pkgs; [ ];
+          packages = with pkgs; [ smlnj ];
         };
       }
     );