diff --git a/lib/hexo/load_config.js b/lib/hexo/load_config.js
index 6d9d3f890b..42bbb719f4 100644
--- a/lib/hexo/load_config.js
+++ b/lib/hexo/load_config.js
@@ -1,12 +1,12 @@
 'use strict';
 
-const merge = require('lodash/merge');
 const { sep, resolve, join, parse } = require('path');
 const tildify = require('tildify');
 const Theme = require('../theme');
 const Source = require('./source');
 const fs = require('hexo-fs');
 const chalk = require('chalk');
+const { deepMerge } = require('hexo-util');
 
 module.exports = ctx => {
   if (!ctx.env.init) return;
@@ -26,7 +26,9 @@ module.exports = ctx => {
 
     ctx.log.debug('Config loaded: %s', chalk.magenta(tildify(configPath)));
 
-    config = merge(ctx.config, config);
+    ctx.config = deepMerge(ctx.config, config);
+    config = ctx.config;
+
     ctx.config_path = configPath;
 
     config.root = config.root.replace(/\/*$/, '/');
diff --git a/lib/hexo/multi_config_path.js b/lib/hexo/multi_config_path.js
index afc3b40b00..c66442b7bd 100644
--- a/lib/hexo/multi_config_path.js
+++ b/lib/hexo/multi_config_path.js
@@ -2,8 +2,8 @@
 
 const { isAbsolute, resolve, join, extname } = require('path');
 const fs = require('hexo-fs');
-const merge = require('lodash/merge');
 const yml = require('js-yaml');
+const { deepMerge } = require('hexo-util');
 
 module.exports = ctx => function multiConfigPath(base, configPaths, outputDir) {
   const { log } = ctx;
@@ -33,7 +33,7 @@ module.exports = ctx => function multiConfigPath(base, configPaths, outputDir) {
   const numPaths = paths.length;
 
   // combine files
-  const combinedConfig = {};
+  let combinedConfig = {};
   let count = 0;
   for (let i = 0; i < numPaths; i++) {
     const configPath = isAbsolute(paths[i]) ? paths[i] : join(base, paths[i]);
@@ -48,10 +48,10 @@ module.exports = ctx => function multiConfigPath(base, configPaths, outputDir) {
     const ext = extname(paths[i]).toLowerCase();
 
     if (ext === '.yml') {
-      merge(combinedConfig, yml.load(file));
+      combinedConfig = deepMerge(combinedConfig, yml.load(file));
       count++;
     } else if (ext === '.json') {
-      merge(combinedConfig, yml.safeLoad(file, {json: true}));
+      combinedConfig = deepMerge(combinedConfig, yml.safeLoad(file, {json: true}));
       count++;
     } else {
       log.w(`Config file ${paths[i]} not supported type.`);