diff --git a/nightly.nix b/nightly.nix
new file mode 100644
index 0000000..f5ea44b
--- /dev/null
+++ b/nightly.nix
@@ -0,0 +1,8 @@
+# Nightly: HEAD of NousResearch/hermes-agent main branch.
+# Auto-updated by scripts/update-nightly.sh — do not edit manually.
+{ pkgs }:
+pkgs.callPackage ./package.nix {
+  pinVersion = "0.3.0-unstable-2026-03-22";
+  pinRev = "43bca6d107c86efc7e60a4a35ca8a55e1b4b4c1e";
+  pinHash = "sha256-cd9jDrphEwjJqNLR3FNrg/xze2sFWhIzmvWLYa2CV5E=";
+}