diff --git a/shell.nix b/shell.nix
index 2951d72..22c9925 100644
--- a/shell.nix
+++ b/shell.nix
@@ -3,5 +3,6 @@
 pkgs.mkShell {
   buildInputs = [
     pkgs.elixir
+    pkgs.erlang
   ];
 }