diff --git a/pkgs/applications/networking/browsers/chromium/common.nix b/pkgs/applications/networking/browsers/chromium/common.nix
index fa113fd4bbd9..888ef5e02dc1 100644
--- a/pkgs/applications/networking/browsers/chromium/common.nix
+++ b/pkgs/applications/networking/browsers/chromium/common.nix
@@ -281,9 +281,12 @@ let
       # Partial revert of https://github.com/chromium/chromium/commit/3687976b0c6d36cf4157419a24a39f6770098d61
       # allowing us to use our rustc and our clang.
       ./patches/chromium-121-rust.patch
-    ] ++ lib.optionals (chromiumVersionAtLeast "126") [
+    ] ++ lib.optionals (versionRange "126" "129") [
       # Rebased variant of patch right above to build M126+ with our rust and our clang.
       ./patches/chromium-126-rust.patch
+    ] ++ lib.optionals (chromiumVersionAtLeast "129") [
+      # Rebased variant of patch right above to build M129+ with our rust and our clang.
+      ./patches/chromium-129-rust.patch
     ];
 
     postPatch = ''
diff --git a/pkgs/applications/networking/browsers/chromium/patches/chromium-129-rust.patch b/pkgs/applications/networking/browsers/chromium/patches/chromium-129-rust.patch
new file mode 100644
index 000000000000..1fe0c7f87324
--- /dev/null
+++ b/pkgs/applications/networking/browsers/chromium/patches/chromium-129-rust.patch
@@ -0,0 +1,21 @@
+diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
+index 45086d6838cac..81132ad8ecb31 100644
+--- a/build/config/compiler/BUILD.gn
++++ b/build/config/compiler/BUILD.gn
+@@ -1727,16 +1727,6 @@ config("runtime_library") {
+     configs += [ "//build/config/c++:runtime_library" ]
+   }
+ 
+-  # Rust and C++ both provide intrinsics for LLVM to call for math operations. We
+-  # want to use the C++ intrinsics, not the ones in the Rust compiler_builtins
+-  # library. The Rust symbols are marked as weak, so that they can be replaced by
+-  # the C++ symbols. This config ensures the C++ symbols exist and are strong in
+-  # order to cause that replacement to occur by explicitly linking in clang's
+-  # compiler-rt library.
+-  if (is_clang && !is_nacl && !is_cronet_build) {
+-    configs += [ "//build/config/clang:compiler_builtins" ]
+-  }
+-
+   # TODO(crbug.com/40570904): Come up with a better name for is POSIX + Fuchsia
+   # configuration.
+   if (is_posix || is_fuchsia) {
diff --git a/pkgs/applications/networking/browsers/chromium/upstream-info.nix b/pkgs/applications/networking/browsers/chromium/upstream-info.nix
index 1aee35f96b89..c44c7fc0f70d 100644
--- a/pkgs/applications/networking/browsers/chromium/upstream-info.nix
+++ b/pkgs/applications/networking/browsers/chromium/upstream-info.nix
@@ -1,22 +1,22 @@
 {
   stable = {
     chromedriver = {
-      hash_darwin = "sha256-UtBJZG+pRdqwxWsvuxYrRJsmFdMEa5h6lWXt39cPxF0=";
+      hash_darwin = "sha256-303weqU04cCCwlLlSVnEyvKvHu09RjGFLmg5cf/exss=";
       hash_darwin_aarch64 =
-        "sha256-2HFrIwc8Jzlg6/eKkJqfd8kwS8c6powU2RnpBGMSBak=";
-      hash_linux = "sha256-8EEJL0A/t0VabaKHEHC2WHwygUo+PCsKeU09SqRzkVE=";
-      version = "128.0.6613.137";
+        "sha256-TybJYKeMzm9FQp0Jqx82VF1OOiVSpS/QgNUEDlWG7Uc=";
+      hash_linux = "sha256-D8aKGKnbFT6YUhyhZUuz/XhCrUVS+Y7I7GaI6Qfv2bE=";
+      version = "129.0.6668.58";
     };
     deps = {
       gn = {
-        hash = "sha256-BiMGbML5aNUt4JzzVqSszBj+8BMlEc92csNugo5qjUk=";
-        rev = "b2afae122eeb6ce09c52d63f67dc53fc517dbdc8";
+        hash = "sha256-8o3rDdojqVHMQCxI2T3MdJOXKlW3XX7lqpy3zWhJiaA=";
+        rev = "d010e218ca7077928ad7c9e9cc02fe43b5a8a0ad";
         url = "https://gn.googlesource.com/gn";
-        version = "2024-06-11";
+        version = "2024-08-19";
       };
     };
-    hash = "sha256-/q+Z1a1EFZRQvC3pmuDbzJWzSSYkI7bfgUAaJRBaj00=";
-    version = "128.0.6613.137";
+    hash = "sha256-8dKWu2/ZKw5ZthH1s5wR+h9b0aIqlDhNsPUrlE9DMQg=";
+    version = "129.0.6668.58";
   };
   ungoogled-chromium = {
     deps = {