diff --git a/CHANGELOG.md b/CHANGELOG.md
index db05a5e0..7e040a1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Update `protoc@latest` to 3.28.0.
+
 ## [2.42.35] - 2024-08-28
 
 - Update `protoc@latest` to 3.27.4.
diff --git a/manifests/protoc.json b/manifests/protoc.json
index 0ab82362..4d29dc8c 100644
--- a/manifests/protoc.json
+++ b/manifests/protoc.json
@@ -3,10 +3,40 @@
   "template": null,
   "license_markdown": "[BSD-3-Clause](https://github.com/protocolbuffers/protobuf/blob/HEAD/LICENSE)",
   "latest": {
-    "version": "3.27.4"
+    "version": "3.28.0"
   },
   "3": {
-    "version": "3.27.4"
+    "version": "3.28.0"
+  },
+  "3.28": {
+    "version": "3.28.0"
+  },
+  "3.28.0": {
+    "x86_64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v28.0/protoc-28.0-linux-x86_64.zip",
+      "etag": "0x8DCC79A6BA9F65A",
+      "checksum": "b2e187c8b9f2d97cd3ecae4926d1bb2cbebe3ab768e7c987cbc86bb17f319358"
+    },
+    "x86_64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v28.0/protoc-28.0-osx-x86_64.zip",
+      "etag": "0x8DCC79A6BCCE754",
+      "checksum": "92186702964437d3ba2ac3427bb906d9f6b92219ddb3c397a2e734d70be59046"
+    },
+    "x86_64_windows": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v28.0/protoc-28.0-win64.zip",
+      "etag": "0x8DCC79A6BFBD8CC",
+      "checksum": "349654eb0a66a37a7a8aabb89a32379216e7188233dfc6167d40f16f0932a205"
+    },
+    "aarch64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v28.0/protoc-28.0-linux-aarch_64.zip",
+      "etag": "0x8DCC79A6B594B06",
+      "checksum": "d622619dcbfb5ecb281cfb92c1a74d6a0f42e752d9a2774b197f475f7ab1c8c4"
+    },
+    "aarch64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v28.0/protoc-28.0-osx-aarch_64.zip",
+      "etag": "0x8DCC79A6BAE8512",
+      "checksum": "4e05879bb7f5b6209461e0cff58c20dfcb117bede7d4737ed8ec6383074fda24"
+    }
   },
   "3.27": {
     "version": "3.27.4"