diff --git a/bin/args.js b/bin/args.js
index ccfdd3f..46d5c5e 100644
--- a/bin/args.js
+++ b/bin/args.js
@@ -1,7 +1,6 @@
 var fromArgs = require('browserify/bin/args');
 var watchify = require('../');
 var defined = require('defined');
-var xtend = require('xtend');
 
 module.exports = function (args) {
     var b = fromArgs(args, watchify.args);
@@ -12,5 +11,5 @@ module.exports = function (args) {
         opts.ignoreWatch = ignoreWatch;
     }
 
-    return watchify(b, xtend(opts, b.argv));
+    return watchify(b, Object.assign(opts, b.argv));
 };
diff --git a/index.js b/index.js
index 0753b9f..0f00091 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,6 @@
 var through = require('through2');
 var path = require('path');
 var chokidar = require('chokidar');
-var xtend = require('xtend');
 var anymatch = require('anymatch');
 
 module.exports = watchify;
@@ -17,7 +16,7 @@ function watchify (b, opts) {
     var changingDeps = {};
     var pending = false;
     var updating = false;
-    
+
     var wopts = {persistent: true};
     if (opts.ignoreWatch) {
         var ignored = opts.ignoreWatch !== true
@@ -35,39 +34,39 @@ function watchify (b, opts) {
         b.on('reset', collect);
         collect();
     }
-    
+
     function collect () {
         b.pipeline.get('deps').push(through.obj(function(row, enc, next) {
             var file = row.expose ? b._expose[row.id] : row.file;
             cache[file] = {
                 source: row.source,
-                deps: xtend(row.deps)
+                deps: Object.assign({}, row.deps)
             };
             this.push(row);
             next();
         }));
     }
-    
+
     b.on('file', function (file) {
         watchFile(file);
     });
-    
+
     b.on('package', function (pkg) {
         var file = path.join(pkg.__dirname, 'package.json');
         watchFile(file);
         if (pkgcache) pkgcache[file] = pkg;
     });
-    
+
     b.on('reset', reset);
     reset();
-    
+
     function reset () {
         var time = null;
         var bytes = 0;
         b.pipeline.get('record').on('end', function () {
             time = Date.now();
         });
-        
+
         b.pipeline.get('wrap').push(through(write, end));
         function write (buf, enc, next) {
             bytes += buf.length;
@@ -84,11 +83,11 @@ function watchify (b, opts) {
             this.push(null);
         }
     }
-    
+
     var fwatchers = {};
     var fwatcherFiles = {};
     var ignoredFiles = {};
-    
+
     b.on('transform', function (tr, mfile) {
         tr.on('file', function (dep) {
             watchFile(mfile, dep);
@@ -122,12 +121,12 @@ function watchify (b, opts) {
         fwatchers[file].push(w);
         fwatcherFiles[file].push(dep);
     }
-    
+
     function invalidate (id) {
         if (cache) delete cache[id];
         if (pkgcache) delete pkgcache[id];
         changingDeps[id] = true;
-        
+
         if (!updating && fwatchers[id]) {
             fwatchers[id].forEach(function (w) {
                 w.close();
@@ -135,12 +134,12 @@ function watchify (b, opts) {
             delete fwatchers[id];
             delete fwatcherFiles[id];
         }
-        
+
         // wait for the disk/editor to quiet down first:
         if (pending) clearTimeout(pending);
         pending = setTimeout(notify, delay);
     }
-    
+
     function notify () {
         if (updating) {
             pending = setTimeout(notify, delay);
@@ -150,13 +149,13 @@ function watchify (b, opts) {
             changingDeps = {};
         }
     }
-    
+
     b.close = function () {
         Object.keys(fwatchers).forEach(function (id) {
             fwatchers[id].forEach(function (w) { w.close() });
         });
     };
-    
+
     b._watcher = function (file, opts) {
         return chokidar.watch(file, opts);
     };
diff --git a/package.json b/package.json
index 0fba55f..c0fb7de 100644
--- a/package.json
+++ b/package.json
@@ -13,8 +13,7 @@
     "chokidar": "^3.4.0",
     "defined": "^1.0.0",
     "outpipe": "^1.1.0",
-    "through2": "^4.0.2",
-    "xtend": "^4.0.2"
+    "through2": "^4.0.2"
   },
   "devDependencies": {
     "brfs": "^2.0.1",