diff --git a/nightly.nix b/nightly.nix
index f979331..d99ec59 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 = "0.20.4-unstable-2026-08-20.68518411";
-  pinRev = "6851841112e921537eb7195ef6e8be7d2ca2d2f6";
-  pinHash = "sha256-xt+9SK8IV7qQYP4c4/cVFOjgQNYhgaR/yAVTD86UsuA=";
+  pinVersion = "0.21.0-unstable-2026-09-07.c4a5deef";
+  pinRev = "c4a5deeffa959f8ebc891e02c5bcf767aff1dd2a";
+  pinHash = "sha256-Rwio6Nw4U9bq8+I9nld+OKYyIoEaGGBE3W2hf8jMSyo=";
 }