diff --git a/package.json b/package.json
index c22ccb114..24a80e93f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "promises-book",
   "description": "Promises book(japanese).",
-  "version": "1.6.0",
+  "version": "1.6.1",
   "homepage": "https://github.com/azu/promises-book",
   "repository": {
     "type": "git",