diff --git a/book.json b/book.json
index 8afdde8..55fb5c3 100644
--- a/book.json
+++ b/book.json
@@ -1,5 +1,5 @@
 {
-	"gitbook": "3.x",
+	"gitbook": "2.x",
 	"title": "Go语言圣经",
 	"description": "<The Go Programming Language>中文版",
 	"language": "zh-hans",