diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8a72e59..5d319d6c 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 3.31.1.
+
 ## [2.52.2] - 2025-05-27
 
 - Update `mdbook@latest` to 0.4.51.
diff --git a/manifests/protoc.json b/manifests/protoc.json
index fe595435..51ca2954 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": "3.31.0"
+    "version": "3.31.1"
   },
   "3": {
-    "version": "3.31.0"
+    "version": "3.31.1"
   },
   "3.31": {
-    "version": "3.31.0"
+    "version": "3.31.1"
+  },
+  "3.31.1": {
+    "x86_64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v31.1/protoc-31.1-linux-x86_64.zip",
+      "etag": "0x8DD9E18EFD1B2E2",
+      "checksum": "96553041f1a91ea0efee963cb16f462f5985b4d65365f3907414c360044d8065"
+    },
+    "x86_64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v31.1/protoc-31.1-osx-x86_64.zip",
+      "etag": "0x8DD9E18F021E98E",
+      "checksum": "485e87088b18614c25a99b1c0627918b3ff5b9fde54922fb1c920159fab7ba29"
+    },
+    "x86_64_windows": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v31.1/protoc-31.1-win64.zip",
+      "etag": "0x8DD9E18F0214DFA",
+      "checksum": "70381b116ab0d71cb6a5177d9b17c7c13415866603a0fd40d513dafe32d56c35"
+    },
+    "aarch64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v31.1/protoc-31.1-linux-aarch_64.zip",
+      "etag": "0x8DD9E18EF7AA62F",
+      "checksum": "6c554de11cea04c56ebf8e45b54434019b1cd85223d4bbd25c282425e306ecc2"
+    },
+    "aarch64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v31.1/protoc-31.1-osx-aarch_64.zip",
+      "etag": "0x8DD9E18EFD16519",
+      "checksum": "4aeea0a34b0992847b03a8489a8dbedf3746de01109b74cc2ce9b6888a901ed9"
+    }
   },
   "3.31.0": {
     "x86_64_linux_gnu": {