diff --git a/lass/5pkgs/nix-index-update/default.nix b/lass/5pkgs/nix-index-update/default.nix
new file mode 100644
index 000000000..40be8d1a3
--- /dev/null
+++ b/lass/5pkgs/nix-index-update/default.nix
@@ -0,0 +1,9 @@
+{ pkgs }:
+pkgs.writers.writeDashBin "nix-index-update" ''
+  set -efux
+  filename="index-$(uname -m)-$(uname | tr A-Z a-z)"
+  mkdir -p ~/.cache/nix-index && cd ~/.cache/nix-index
+  # -N will only download a new version if there is an update.
+  ${pkgs.wget}/bin/wget -q -N https://github.com/Mic92/nix-index-database/releases/latest/download/$filename
+  ln -f $filename files
+''