diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f4c0901..f64b048a 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 3.26.1.
+
 ## [2.31.0] - 2024-03-27
 
 - Support `typos`. ([#422](https://github.com/taiki-e/install-action/pull/422), thanks @jayvdb)
diff --git a/manifests/protoc.json b/manifests/protoc.json
index 8faf75dd..f732badf 100644
--- a/manifests/protoc.json
+++ b/manifests/protoc.json
@@ -2,13 +2,35 @@
   "rust_crate": null,
   "template": null,
   "latest": {
-    "version": "3.26.0"
+    "version": "3.26.1"
   },
   "3": {
-    "version": "3.26.0"
+    "version": "3.26.1"
   },
   "3.26": {
-    "version": "3.26.0"
+    "version": "3.26.1"
+  },
+  "3.26.1": {
+    "x86_64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v26.1/protoc-26.1-linux-x86_64.zip",
+      "checksum": "a7be2928c0454f132c599e25b79b7ad1b57663f2337d7f7e468a1d59b98ec1b0"
+    },
+    "x86_64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v26.1/protoc-26.1-osx-x86_64.zip",
+      "checksum": "febd8821c3a2a23f72f4641471e0ab6486f4fb07b68111490a27a31681465b3c"
+    },
+    "x86_64_windows": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v26.1/protoc-26.1-win64.zip",
+      "checksum": "9090d135a1159042b13b4e51b210e40cb820d85a5032a6eca5f9b3ca3bdfb539"
+    },
+    "aarch64_linux_gnu": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v26.1/protoc-26.1-linux-aarch_64.zip",
+      "checksum": "64a3b3b5f7dac0c8f9cf1cb85b2b1a237eb628644f6bcb0fb8f23db6e0d66181"
+    },
+    "aarch64_macos": {
+      "url": "https://github.com/protocolbuffers/protobuf/releases/download/v26.1/protoc-26.1-osx-aarch_64.zip",
+      "checksum": "26a29befa8891ecc48809958c909d284f2b9539a2eb47f22cadc631fe6abe8fd"
+    }
   },
   "3.26.0": {
     "x86_64_linux_gnu": {