diff --git a/CHANGELOG.md b/CHANGELOG.md
index 542ad5bf..65bba172 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 3.29.1.
+
 ## [2.46.0] - 2024-12-04
 
 - Improve robustness of `cargo-binstall` fallback. ([#556](https://github.com/taiki-e/install-action/pull/556))
diff --git a/manifests/protoc.json b/manifests/protoc.json
index 8866f37d..544017f7 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": "3.29.0"
+    "version": "3.29.1"
   },
   "3": {
-    "version": "3.29.0"
+    "version": "3.29.1"
   },
   "3.29": {
-    "version": "3.29.0"
+    "version": "3.29.1"
+  },
+  "3.29.1": {
+    "x86_64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v29.1/protoc-29.1-linux-x86_64.zip",
+      "etag": "0x8DD1480BBF9D305",
+      "checksum": "00c83fe9722d85e96c81b941b29f17a744b33b4ce66e0f18009fd8937de22c60"
+    },
+    "x86_64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v29.1/protoc-29.1-osx-x86_64.zip",
+      "etag": "0x8DD1480BC5A98F7",
+      "checksum": "db02b4b86de4d4cced3ea9934347da28dc95e7f38863ffc4ce3cc26283028da6"
+    },
+    "x86_64_windows": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v29.1/protoc-29.1-win64.zip",
+      "etag": "0x8DD1480BC7E259D",
+      "checksum": "7ea48225857ffc1224588c335c2b1af9d78a18af9d57c0528cca3193e336e9ce"
+    },
+    "aarch64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v29.1/protoc-29.1-linux-aarch_64.zip",
+      "etag": "0x8DD1480BBA1B5ED",
+      "checksum": "1f74a3f3355de7c0666bc125611c13532c2598f853521d0d3e621a5b09f24799"
+    },
+    "aarch64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v29.1/protoc-29.1-osx-aarch_64.zip",
+      "etag": "0x8DD1480BC10012F",
+      "checksum": "b8fd5976926198a7c4ea5c6eb4bf78959d5faed27bfc618254caa1043f770445"
+    }
   },
   "3.29.0": {
     "x86_64_linux_gnu": {