diff --git a/flake.nix b/flake.nix
index 7d83c68..93ef2b0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,6 +15,7 @@
     bundler = pkgs.bundler.override { inherit ruby; };
     developmentInputs = with pkgs; [
       bundler
+      libffi
       libnotify
       pkg-config
       postgresql_12