diff --git a/package.json b/package.json
index b40ce3a..125fa36 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,6 @@
     "meow": "*"
   },
   "devDependencies": {
-    "underscore": "1.7.0",
     "mocha": "2.0.1"
   },
   "engines": {
diff --git a/test/test_formats.js b/test/test_formats.js
index df186ca..92a705a 100644
--- a/test/test_formats.js
+++ b/test/test_formats.js
@@ -1,7 +1,5 @@
 var assert = require('assert');
 
-var _ = require('underscore');
-
 var dateFormat = require('../lib/dateformat');
 
 var expects = {
@@ -47,7 +45,7 @@ function timezoneOffset(date) {
 }
 
 describe('dateformat([now], [mask])', function() {
-  _.each(dateFormat.masks, function(value, key) {
+  Object.keys(dateFormat.masks).forEach(function(key) {
     it('should format `' + key + '` mask', function(done) {
       var now = new Date(2014, 10, 26, 13, 19, 44);
       var tzOffset = timezoneOffset(now);