diff --git a/flake.nix b/flake.nix
index 49cb499..9260c98 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,6 +39,7 @@
             pkg-config
             libusb
             openssl
+            dhall-lsp-server
           ];
         };
       formatter = pkgs.alejandra;