diff --git a/examples/hide-todo.js b/examples/hide-todo.js
index 54cffa1..43daf1b 100644
--- a/examples/hide-todo.js
+++ b/examples/hide-todo.js
@@ -5,7 +5,6 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import ReactDOM from 'react-dom';
 import Animate from 'rc-animate';
-import assign from 'object-assign';
 
 class Todo extends React.Component {
   static propTypes = {
@@ -55,13 +54,9 @@ class TodoList extends React.Component {
   handleHide = (i, item) => {
     const newItems = this.state.items.concat([]);
     newItems.forEach((n, index) => {
-      newItems[index] = assign({}, n, {
-        visible: true,
-      });
-    });
-    newItems[i] = assign({}, item, {
-      visible: false,
+      newItems[index] = { ...n, visible: true };
     });
+    newItems[i] = { ...item, visible: false };
     this.setState({ items: newItems });
   }
 
diff --git a/examples/simple.js b/examples/simple.js
index 56bb461..29e7d21 100644
--- a/examples/simple.js
+++ b/examples/simple.js
@@ -5,13 +5,10 @@ import Animate from 'rc-animate';
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import ReactDOM from 'react-dom';
-import assign from 'object-assign';
 
 const Div = (props) => {
   const { style, show, ...restProps } = props;
-  const newStyle = assign({}, style, {
-    display: show ? '' : 'none',
-  });
+  const newStyle = { ...style, display: show ? '' : 'none' };
   return <div {...restProps} style={newStyle}/>;
 };
 
diff --git a/package.json b/package.json
index 03713a6..30917f4 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,6 @@
     "core-js": "^2.5.1",
     "expect.js": "0.3.x",
     "jquery": "~1.11.3",
-    "object-assign": "4.x",
     "pre-commit": "1.x",
     "rc-test": "6.x",
     "rc-tools": "6.x",