diff --git a/package-lock.json b/package-lock.json
index c6c3cd02e8..c4dd965da9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "js-primer",
-  "version": "2.0.0",
+  "version": "3.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 58d466c5eb..dc166e3e34 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "js-primer",
   "private": true,
   "license": "MIT",
-  "version": "2.0.0",
+  "version": "3.0.0",
   "description": "JavaScriptの入門本",
   "main": "index.js",
   "directories": {