diff --git a/HISTORY.md b/HISTORY.md
index dd71de6..182cd06 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,12 @@
 Pure Change History
 ===================
 
+NEXT
+----
+
+
+
+
 0.4.0 (2014-02-06)
 ------------------
 
diff --git a/bower.json b/bower.json
index 5db0b00..7d0fb5d 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pure",
-  "version": "0.4.0",
+  "version": "0.4.1-pre",
   "devDependencies": {
     "normalize-css": "1.1.3"
   }
diff --git a/package.json b/package.json
index c8349da..708c54a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pure",
-  "version": "0.4.0",
+  "version": "0.4.1-pre",
   "private": true,
   "repository": "git://github.com/yui/pure.git",
   "scripts": {