diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index 0652049e66ad7..bd6b9b5c501d7 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -32,7 +32,7 @@ let
     "18.1.8".officialRelease.sha256 = "sha256-iiZKMRo/WxJaBXct9GdAcAT3cz9d9pnAcO1mmR6oPNE=";
     "19.1.7".officialRelease.sha256 = "sha256-cZAB5vZjeTsXt9QHbP5xluWNQnAHByHtHnAhVDV0E6I=";
     "20.1.6".officialRelease.sha256 = "sha256-PfCzECiCM+k0hHqEUSr1TSpnII5nqIxg+Z8ICjmMj0Y=";
-    "21.1.0-rc1".officialRelease.sha256 = "sha256-EZMG3kNqGTvKSuvslbrtNnyqBCG5C2gN9Y2qHbiuh8Q=";
+    "21.1.0-rc2".officialRelease.sha256 = "sha256-7qE5MAYuB+gr5NmQm+7jJWCarIjoDUtyd8SDiJwvITw=";
     "22.0.0-git".gitRelease = {
       rev = "90de4a4ac96ef314e3af9c43c516d5aaf105777a";
       rev-version = "22.0.0-unstable-2025-07-28";