diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 1911c58b7e7c..5f685ed79471 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -2818,7 +2818,7 @@ mapAliases {
   openbsdCross = openbsd; # Added 2024-09-06
 
   # LLVM packages for (integration) testing that should not be used inside Nixpkgs:
-  llvmPackages_latest = llvmPackages_20;
+  llvmPackages_latest = llvmPackages_21;
 
   /*
     If these are in the scope of all-packages.nix, they cause collisions