diff --git a/config/cocos2d-x.org/en/book.json b/config/cocos2d-x.org/en/book.json
index 90ec0da..61abb92 100755
--- a/config/cocos2d-x.org/en/book.json
+++ b/config/cocos2d-x.org/en/book.json
@@ -25,7 +25,7 @@
         ],
         "version": [
             {
-                "name": "3.x",
+                "name": "4.x",
                 "links": [
                     {
                         "name": "3.x",
diff --git a/config/cocos2d-x.org/zh/book.json b/config/cocos2d-x.org/zh/book.json
index 48192ae..64b9cfb 100755
--- a/config/cocos2d-x.org/zh/book.json
+++ b/config/cocos2d-x.org/zh/book.json
@@ -35,7 +35,7 @@
         ],
         "version": [
             {
-                "name": "3.x",
+                "name": "4.x",
                 "links": [
                     {
                         "name": "3.x",