diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98534549..d6ebe0af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## v4.0.0 - 2024-10-05
+
 > [!IMPORTANT]
 >
 > See also https://github.com/orgs/marp-team/discussions/533 about new changes in Marp Core.
diff --git a/package-lock.json b/package-lock.json
index e6d01a20..78e6675e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@marp-team/marp-cli",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@marp-team/marp-cli",
-      "version": "3.4.0",
+      "version": "4.0.0",
       "license": "MIT",
       "dependencies": {
         "@marp-team/marp-core": "^4.0.0",
diff --git a/package.json b/package.json
index 3f3196dc..8714c424 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@marp-team/marp-cli",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "description": "A CLI interface for Marp and Marpit based converters",
   "license": "MIT",
   "author": {