diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71e546ee..43903ec4 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 3.27.3.
+
 ## [2.42.13] - 2024-07-31
 
 - Update `just@latest` to 1.33.0.
diff --git a/manifests/protoc.json b/manifests/protoc.json
index 52e06188..03018fa9 100644
--- a/manifests/protoc.json
+++ b/manifests/protoc.json
@@ -3,13 +3,40 @@
   "template": null,
   "license_markdown": "[BSD-3-Clause](https://github.com/protocolbuffers/protobuf/blob/HEAD/LICENSE)",
   "latest": {
-    "version": "3.27.2"
+    "version": "3.27.3"
   },
   "3": {
-    "version": "3.27.2"
+    "version": "3.27.3"
   },
   "3.27": {
-    "version": "3.27.2"
+    "version": "3.27.3"
+  },
+  "3.27.3": {
+    "x86_64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v27.3/protoc-27.3-linux-x86_64.zip",
+      "etag": "0x8DCB17AB64A6DB9",
+      "checksum": "6dab2adab83f915126cab53540d48957c40e9e9023969c3e84d44bfb936c7741"
+    },
+    "x86_64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v27.3/protoc-27.3-osx-x86_64.zip",
+      "etag": "0x8DCB17AB64A1FF0",
+      "checksum": "ce282648fed0e7fbd6237d606dc9ec168dd2c1863889b04efa0b19c47da65d1b"
+    },
+    "x86_64_windows": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v27.3/protoc-27.3-win64.zip",
+      "etag": "0x8DCB17AB6974CCF",
+      "checksum": "bdccd341a0c25ff4f65d8530f170c78ce5681e42920aa5d892f27ac06cc3bba0"
+    },
+    "aarch64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v27.3/protoc-27.3-linux-aarch_64.zip",
+      "etag": "0x8DCB17AB5CD183F",
+      "checksum": "bdad36f3ad7472281d90568c4956ea2e203c216e0de005c6bd486f1920f2751c"
+    },
+    "aarch64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v27.3/protoc-27.3-osx-aarch_64.zip",
+      "etag": "0x8DCB17AB64A46DB",
+      "checksum": "b22116bd97cdbd7ea25346abe635a9df268515fe5ef5afa93cd9a68fc2513f84"
+    }
   },
   "3.27.2": {
     "x86_64_linux_gnu": {