diff --git a/book.json b/book.json
index 1373ff69..903cd65b 100644
--- a/book.json
+++ b/book.json
@@ -1,5 +1,5 @@
 {
-    "gitbook": "2.6.7",
+    "gitbook": "2.x.x",
     "plugins": [
         "prism",
         "-highlight",