diff --git a/.travis.yml b/.travis.yml
index 826f8c9..d132622 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 sudo: false
 language: node_js
 node_js:
+  - '0.12'
   - '4'
   - '6'
 script:
diff --git a/History.md b/History.md
index 7bbfcc1..b7f8438 100644
--- a/History.md
+++ b/History.md
@@ -1,4 +1,10 @@
 
+1.5.2 / 2017-09-06
+==================
+
+**fixes**
+  * [[`59099d5`](http://github.com/node-modules/mm/commit/59099d530b7c81056ce6429c639729183782ecd3)] - fix: use var instead of const (#37) (fengmk2 <<fengmk2@gmail.com>>)
+
 1.5.1 / 2016-07-21
 ==================
 
diff --git a/lib/es6.js b/lib/es6.js
index e942015..d2b31d3 100644
--- a/lib/es6.js
+++ b/lib/es6.js
@@ -1,17 +1,5 @@
-/**!
- * Copyright(c) fengmk2 and other contributors.
- * MIT Licensed
- *
- * Authors:
- *   fengmk2 <fengmk2@gmail.com> (http://fengmk2.github.com)
- */
-
 'use strict';
 
-/**
- * Module dependencies.
- */
-
 var is = require('is-type-of');
 var sleep = require('co-sleep');
 var mm = require('./mm');
diff --git a/lib/mm.js b/lib/mm.js
index c2108ee..d918151 100644
--- a/lib/mm.js
+++ b/lib/mm.js
@@ -1,17 +1,5 @@
-/**!
- * Copyright(c) node-modules and other contributors.
- * MIT Licensed
- *
- * Authors:
- *   fengmk2 <fengmk2@gmail.com> (http://fengmk2.com)
- */
-
 'use strict';
 
-/**
- * Module dependencies.
- */
-
 var EventEmitter = require('events');
 var muk = require('muk');
 var http = require('http');
@@ -446,7 +434,7 @@ exports.restore = function () {
 };
 
 function omit(obj, key) {
-  const newObj = {};
+  var newObj = {};
   for (var k in obj) {
     if (k !== key) {
       newObj[k] = obj[k];
diff --git a/package.json b/package.json
index f83e998..a4d454a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mm",
-  "version": "1.5.1",
+  "version": "1.5.2",
   "description": "mock mate, mock http request, fs access and so on.",
   "main": "index.js",
   "files": [
@@ -33,10 +33,13 @@
     "node-patch": "*",
     "pedding": "1",
     "should": "6",
-    "should-http": "*",
+    "should-http": "~0.0.4",
     "thunkify-wrap": "1"
   },
   "homepage": "http://github.com/node-modules/mm",
+  "publishConfig": {
+    "tag": "latest-1"
+  },
   "repository": {
     "type": "git",
     "url": "git://github.com/node-modules/mm.git"
@@ -52,4 +55,4 @@
   },
   "author": "fengmk2 <fengmk2@gmail.com> (http://fengmk2.com)",
   "license": "MIT"
-}
+}
\ No newline at end of file