diff --git a/History.md b/History.md
index 997a969..deebe62 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,8 @@
+1.1.1 / 2015-10-22
+==================
+
+ * do not send a content-type when the type is unknown #536
+
 1.1.0 / 2015-10-11
 ==================
 
diff --git a/package.json b/package.json
index dd79994..c4fb6c8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "koa",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "Koa web app framework",
   "main": "lib/application.js",
   "scripts": {