diff --git a/CHANGELOG.md b/CHANGELOG.md
index 832b487..8dd1415 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 
    When set to `false`, all trailing slashes from URLs will be removed.
 
+- Dropped `moment.js` in favor of simple `new Date().toISOString()` as a default value for `lastMod` option.
 - `package.json` cleanups.
 - Added `package.json` `main` property pointing to the task file.
 - Added `snazzy` for better `standard` output.
diff --git a/package.json b/package.json
index 08dd3ec..fecbb55 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,6 @@
   ],
   "dependencies": {
     "chalk": "^2.0.0",
-    "moment": "^2.14.1",
     "xmlbuilder": "^9.0.0"
   },
   "devDependencies": {
diff --git a/tasks/sitemap_xml.js b/tasks/sitemap_xml.js
index dce93e4..03df961 100644
--- a/tasks/sitemap_xml.js
+++ b/tasks/sitemap_xml.js
@@ -8,7 +8,6 @@
 'use strict'
 
 const chalk = require('chalk')
-const moment = require('moment')
 const builder = require('xmlbuilder')
 
 module.exports = function (grunt) {
@@ -22,7 +21,7 @@ module.exports = function (grunt) {
       siteRoot: pkg.homepage,
       stripIndex: true,
       trailingSlash: true,
-      lastMod: moment().format('YYYY-MM-DDTHH:mm:ssZ'),
+      lastMod: new Date().toISOString(),
       priority: '0.5',
       changeFreq: 'weekly',
       pretty: false