diff --git a/lib/hexo/post.js b/lib/hexo/post.js
index 58814d1c72..3a0075ef3d 100644
--- a/lib/hexo/post.js
+++ b/lib/hexo/post.js
@@ -4,8 +4,6 @@ const assert = require('assert');
 const moment = require('moment');
 const Promise = require('bluebird');
 const { join, extname } = require('path');
-const assignIn = require('lodash/assignIn');
-const clone = require('lodash/clone');
 const chalk = require('chalk');
 const yaml = require('js-yaml');
 const { slugize, escapeRegExp } = require('hexo-util');
@@ -121,7 +119,7 @@ Post.prototype._renderScaffold = function(data) {
   let yfmSplit;
 
   return this._getScaffold(data.layout).then(scaffold => {
-    const frontMatter = prepareFrontMatter(clone(data));
+    const frontMatter = prepareFrontMatter({...data});
     yfmSplit = yfm.split(scaffold);
 
     return tag.render(yfmSplit.data, frontMatter);
@@ -202,7 +200,7 @@ Post.prototype.publish = function(data, replace, callback) {
     return fs.readFile(src);
   }).then(content => {
     // Create post
-    assignIn(data, yfm(content));
+    Object.assign(data, yfm(content));
     data.content = data._content;
     delete data._content;