diff --git a/bower.json b/bower.json
index 3875dcf..156da9c 100644
--- a/bower.json
+++ b/bower.json
@@ -1,7 +1,7 @@
 {
   "name": "c3",
   "main": "c3.min.js",
-  "version": "0.1.27",
+  "version": "0.1.28",
   "homepage": "https://github.com/masayuki0812/c3",
   "authors": [
     "Masayuki Tanaka <masayuki0812@mac.com>"
diff --git a/c3.js b/c3.js
index 346a3cc..67ea8c0 100644
--- a/c3.js
+++ b/c3.js
@@ -2,7 +2,7 @@
     'use strict';
 
     var c3 = {
-        version: "0.1.27"
+        version: "0.1.28"
     };
 
     var CLASS = {
diff --git a/c3.min.js b/c3.min.js
index e0421c1..dbfe7fb 100644
--- a/c3.min.js
+++ b/c3.min.js
@@ -1,2 +1,2 @@
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diff --git a/package.json b/package.json
index b679294..5d200cd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "c3",
-  "version": "0.1.27",
+  "version": "0.1.28",
   "description": "D3-based reusable chart library",
   "main": "c3.js",
   "scripts": {