diff --git a/book.json b/book.json
index d173c9a..e263567 100644
--- a/book.json
+++ b/book.json
@@ -1,5 +1,5 @@
 {
-	"gitbook": "2.x",
+	"gitbook": "3.x",
 	"title": "Go语言高级编程",
 	"description": "Go语言高级编程",
 	"language": "zh-hans",