diff --git a/History.md b/History.md
index 678317d..0f98853 100644
--- a/History.md
+++ b/History.md
@@ -2,8 +2,9 @@
 HEAD /
 ==================
 
- * refactor mime with mime-extended
- * refactor to use koa-is-json
+ * refactor to use:
+    * koa-is-json
+    * set-type
 
 0.5.5 / 2014-04-14
 ==================
diff --git a/lib/response.js b/lib/response.js
index b5d0dbc..5a57b14 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -6,11 +6,11 @@
 var ensureErrorHandler = require('error-inject');
 var escape = require('escape-html');
 var onfinish = require('finished');
+var setType = require('set-type');
 var status = require('statuses');
 var destroy = require('dethroy');
 var http = require('http');
 var path = require('path');
-var mime = require('mime-extended');
 var basename = path.basename;
 var extname = path.extname;
 
@@ -264,7 +264,7 @@ module.exports = {
    */
 
   set type(type) {
-    this.set('Content-Type', mime.contentType(type));
+    this.set('Content-Type', setType(type));
   },
 
   /**
diff --git a/package.json b/package.json
index c00394a..b91d61a 100644
--- a/package.json
+++ b/package.json
@@ -25,11 +25,11 @@
     "statuses": "~1.0.1",
     "accepts": "~1.0.0",
     "type-is": "~1.1.0",
+    "set-type": "~1.0.0",
     "finished": "~1.1.1",
     "co": "~3.0.2",
     "debug": "*",
     "mime": "~1.2.11",
-    "mime-extended": "^1.0.0",
     "fresh": "~0.2.1",
     "koa-compose": "~2.2.0",
     "koa-is-json": "~1.0.0",