diff --git a/pkgs/development/compilers/llvm/common/default.nix b/pkgs/development/compilers/llvm/common/default.nix
index 38d081b62d5a..d5f7f0a8405a 100644
--- a/pkgs/development/compilers/llvm/common/default.nix
+++ b/pkgs/development/compilers/llvm/common/default.nix
@@ -478,18 +478,7 @@ let
               stripLen = 1;
               hash = "sha256-fqw5gTSEOGs3kAguR4tINFG7Xja1RAje+q67HJt2nGg=";
             })
-          ]
-          ++
-            lib.optional (lib.versions.major metadata.release_version == "20")
-              # Fix for vt_gen, remove during next git bump
-              # https://github.com/llvm/llvm-project/pull/109817
-              (
-                fetchpatch {
-                  url = "https://github.com/llvm/llvm-project/commit/cace9869775a185793122f845d81a5ff46f15728.patch";
-                  stripLen = 1;
-                  hash = "sha256-lt1iQfNIc3ot1+6J7d7dbqULwT0MyLIwR2EZB7RfPp4=";
-                }
-              );
+          ];
         pollyPatches =
           [ (metadata.getVersionFile "llvm/gnu-install-dirs-polly.patch") ]
           ++ lib.optional (lib.versionAtLeast metadata.release_version "15")
diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index 94c7d66556ed..813c4d44fcb8 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -30,9 +30,9 @@ let
     "18.1.8".officialRelease.sha256 = "sha256-iiZKMRo/WxJaBXct9GdAcAT3cz9d9pnAcO1mmR6oPNE=";
     "19.1.0".officialRelease.sha256 = "sha256-/Ano8LwpGmW3C1ovJyvY3WIfliVkQi130f70WazwzGc=";
     "20.0.0-git".gitRelease = {
-      rev = "81c3499531c3fe03827bd8bc890e3a16db9e4c3c";
-      rev-version = "20.0.0-unstable-2024-09-22";
-      sha256 = "sha256-mQZhQ0qfWs4NmL62H3wNwG28iARUasWh9m8zMCNkRis=";
+      rev = "64f2bff12b8ac40c79004ffacf46a5294600d219";
+      rev-version = "20.0.0-unstable-2024-09-29";
+      sha256 = "sha256-BUlnks9rFjvKRIy7lWhOJQKKNVTewBiCFDbgyRBvuEw=";
     };
   } // llvmVersions;