diff --git a/index.js b/index.js
index 3d7e996..92051f4 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,4 @@
 'use strict';
-var assign = require('lodash.assign');
 var property = require('nested-property');
 var keyBy = require('lodash.keyby');
 
@@ -69,7 +68,7 @@ var groupByParents = function(array, options) {
  */
 
 module.exports = function arrayToTree(data, options) {
-  options = assign(
+  options = Object.assign(
     {
       parentProperty: 'parent_id',
       childrenProperty: 'children',
diff --git a/package-lock.json b/package-lock.json
index 60f943c..fbfde60 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -756,11 +756,6 @@
       "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
       "dev": true
     },
-    "lodash.assign": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/lodash.assign/-/lodash.assign-4.2.0.tgz",
-      "integrity": "sha1-DZnzzNem0mHRm9rrkkUAXShYCOc="
-    },
     "lodash.keyby": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/lodash.keyby/-/lodash.keyby-4.6.0.tgz",
diff --git a/package.json b/package.json
index 5aae64f..f86bb7f 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,6 @@
   },
   "license": "MIT",
   "dependencies": {
-    "lodash.assign": "^4.0.6",
     "lodash.keyby": "^4.6.0",
     "nested-property": "^0.0.7"
   }
diff --git a/yarn.lock b/yarn.lock
index ab18615..1c90ca4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -521,10 +521,6 @@ levn@^0.3.0, levn@~0.3.0:
     prelude-ls "~1.1.2"
     type-check "~0.3.2"
 
-lodash.assign@^4.0.6:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.assign/-/lodash.assign-4.2.0.tgz#0d99f3ccd7a6d261d19bdaeb9245005d285808e7"
-
 lodash.keyby@^4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/lodash.keyby/-/lodash.keyby-4.6.0.tgz#7f6a1abda93fd24e22728a4d361ed8bcba5a4354"