diff --git a/nightly.nix b/nightly.nix
index c07eec9..7a34777 100644
--- a/nightly.nix
+++ b/nightly.nix
@@ -2,7 +2,7 @@
 # Auto-updated by scripts/update-nightly.sh — do not edit manually.
 { pkgs }:
 pkgs.callPackage ./package.nix {
-  pinVersion = "0.21.3-unstable-2026-09-18.c62bd9f2";
-  pinRev = "c62bd9f2078a946108f1c9d9b24bf118963277ef";
-  pinHash = "sha256-hdKTqxd4u1/ss3dSlrPrUVa2+GLHB9UAy8w0TGqpBd4=";
+  pinVersion = "0.21.4-unstable-2026-09-23.4a2bd740";
+  pinRev = "4a2bd7406ee3e09bd30a42cf9a7b970aac6edf9e";
+  pinHash = "sha256-NypEq29m1GiZFRMt3I7giCcHgg3y2Say+CzzN6MvMIg=";
 }