diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index ab515f712110..ebbebb89a54d 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -31,7 +31,7 @@ let
     "18.1.8".officialRelease.sha256 = "sha256-iiZKMRo/WxJaBXct9GdAcAT3cz9d9pnAcO1mmR6oPNE=";
     "19.1.7".officialRelease.sha256 = "sha256-cZAB5vZjeTsXt9QHbP5xluWNQnAHByHtHnAhVDV0E6I=";
     "20.1.8".officialRelease.sha256 = "sha256-ysyB/EYxi2qE9fD5x/F2zI4vjn8UDoo1Z9ukiIrjFGw=";
-    "21.1.0-rc3".officialRelease.sha256 = "sha256-quZuqDIm8OrkDJqu7vJKUP8MF1xCuQNFwW9SnKMFoS8=";
+    "21.1.0".officialRelease.sha256 = "sha256-4DLEZuhREHMl2t0f1iqvXSRSE5VBMVxd94Tj4m8Yf9s=";
     "22.0.0-git".gitRelease = {
       rev = "0b42e117c829c6e127ef4b1bd82807ba01853128";
       rev-version = "22.0.0-unstable-2025-08-31";