diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b629704..8318182e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## v0.4.0 - 2018-12-02
+
 ### Added
 
 - Add `use` method to extend markdown-it parser by plugin ([#105](https://github.com/marp-team/marpit/pull/105))
diff --git a/package.json b/package.json
index e77f8016..8cf250c1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@marp-team/marpit",
-  "version": "0.3.3",
+  "version": "0.4.0",
   "description": "The skinny framework for creating slide deck from Markdown",
   "license": "MIT",
   "author": {