diff --git a/.travis.yml b/.travis.yml
index 3242452..5e27204 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,11 +5,6 @@ node_js:
   - '9'
   - '8'
   - '6'
-  - '4'
-  - '0.12'
-  - '0.10'
-  - '0.8'
-  - '0.6'
 before_install:
   - 'nvm install-latest-npm'
 install:
diff --git a/index.js b/index.js
index 0c979c9..265b2ed 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,4 @@
 var acorn = require('acorn')
-var xtend = require('xtend')
 
 var CJSParser = acorn.Parser
   .extend(require('./lib/bigint'))
@@ -9,7 +8,7 @@ var ESModulesParser = CJSParser
 
 function mapOptions (opts) {
   if (!opts) opts = {}
-  return xtend({
+  return Object.assign({
     ecmaVersion: 2019,
     allowHashBang: true,
     allowReturnOutsideFunction: true
@@ -21,7 +20,7 @@ function getParser (opts) {
   return opts.sourceType === 'module' ? ESModulesParser : CJSParser
 }
 
-module.exports = exports = xtend(acorn, {
+module.exports = exports = Object.assign({}, acorn, {
   parse: function parse (src, opts) {
     return getParser(opts).parse(src, mapOptions(opts))
   },
diff --git a/package.json b/package.json
index 361ef07..f0c4325 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,7 @@
   "dependencies": {
     "acorn": "^6.0.2",
     "acorn-dynamic-import": "^4.0.0",
-    "acorn-walk": "^6.1.0",
-    "xtend": "^4.0.1"
+    "acorn-walk": "^6.1.0"
   },
   "devDependencies": {
     "acorn-bigint": "^0.3.1",