diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index a59d25aa51fe6..f5b86b1c33126 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".officialRelease.sha256 = "sha256-4DLEZuhREHMl2t0f1iqvXSRSE5VBMVxd94Tj4m8Yf9s=";
+    "21.1.1".officialRelease.sha256 = "sha256-IB9Z3bIMwfgw2W2Vxo89CmtCM9DfOyV2Ei64nqgHrgc=";
     "22.0.0-git".gitRelease = {
       rev = "6fc32e93066c59a39b3c8c9be4e4f416653a917e";
       rev-version = "22.0.0-unstable-2025-09-07";