diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index 0d8f1156db4b..9389fe592edb 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -25,7 +25,7 @@ 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=";
-    "21.1.7".officialRelease.sha256 = "sha256-SaRJ7+iZMhhBdcUDuJpMAY4REQVhrvYMqI2aq3Kz08o=";
+    "21.1.8".officialRelease.sha256 = "sha256-pgd8g9Yfvp7abjCCKSmIn1smAROjqtfZaJkaUkBSKW0=";
     "22.0.0-git".gitRelease = {
       rev = "8f51da369e6e7f13bea941e61b4b2c5fa81216f5";
       rev-version = "22.0.0-unstable-2025-12-14";