diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index 329917fb3dfc..0cdc55fbc4c7 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -33,9 +33,9 @@ let
     "19.1.7".officialRelease.sha256 = "sha256-cZAB5vZjeTsXt9QHbP5xluWNQnAHByHtHnAhVDV0E6I=";
     "20.1.5".officialRelease.sha256 = "sha256-WKfY+VvAsZEEc0xYgF6+MsXDXZz7haMU6bxqmUpaHuQ=";
     "21.0.0-git".gitRelease = {
-      rev = "90beda2aba3cac34052827c560449fcb184c7313";
-      rev-version = "21.0.0-unstable-2025-06-08";
-      sha256 = "sha256-+aTUb9Hg/upulKGLKNpqDYKES62mWkjuLZP07WGnBSc=";
+      rev = "9adde28df784f5c0cc960bdabd413ac131a5852e";
+      rev-version = "21.0.0-unstable-2025-06-15";
+      sha256 = "sha256-8HrUSKL3vOd/Jg9svso9ChCr4tvlGOliyGfi18oZLDY=";
     };
   } // llvmVersions;