diff --git a/book.json b/book.json
index 712f491..c1523ba 100644
--- a/book.json
+++ b/book.json
@@ -2,7 +2,7 @@
 	"gitbook": "2.x.x",
 	"title": "Go语言圣经",
 	"description": "<The Go Programming Language>中文版",
-	"language": "zh",
+	"language": "zh-cn",
 	"structure": {
 		"readme": "preface.md"
 	},
diff --git a/cover.jpg b/cover.jpg
index 7b1d42b..d6ce90a 100644
Binary files a/cover.jpg and b/cover.jpg differ
diff --git a/cover_bgd.png b/cover_bgd.png
index b37828c..817f3f8 100644
Binary files a/cover_bgd.png and b/cover_bgd.png differ
diff --git a/cover_patch.png b/cover_patch.png
index 5987c92..de8eb3c 100644
Binary files a/cover_patch.png and b/cover_patch.png differ
diff --git a/gopl-zh-qrcode.png b/gopl-zh-qrcode.png
index 86164ca..4912088 100644
Binary files a/gopl-zh-qrcode.png and b/gopl-zh-qrcode.png differ
diff --git a/tools/mkqrcode.go b/tools/mkqrcode.go
index 9173a5a..e9d3238 100644
--- a/tools/mkqrcode.go
+++ b/tools/mkqrcode.go
@@ -15,7 +15,7 @@ import (
 )
 
 const (
-	gopl_zh_url = "https://bitbucket.org/golang-china/gopl-zh"
+	gopl_zh_url = "https://github.com/golang-china/gopl-zh"
 	output      = "gopl-zh-qrcode.png"
 )