diff --git a/package.json b/package.json
index 58866dc17..fc8e442b1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rc-slider",
-  "version": "7.0.1",
+  "version": "7.0.2",
   "description": "Slider UI component for React",
   "keywords": [
     "react",
@@ -68,7 +68,6 @@
   "dependencies": {
     "babel-runtime": "6.x",
     "classnames": "^2.2.5",
-    "object-assign": "^4.1.1",
     "prop-types": "^15.5.4",
     "rc-tooltip": "^3.4.2",
     "rc-util": "^4.0.0",
diff --git a/src/Handle.jsx b/src/Handle.jsx
index c878af73a..4442a0c72 100644
--- a/src/Handle.jsx
+++ b/src/Handle.jsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import assign from 'object-assign';
 
 export default class Handle extends React.Component {
   render() {
@@ -8,7 +7,12 @@ export default class Handle extends React.Component {
       className, vertical, offset, handleStyle, ...restProps,
     } = this.props;
     const style = vertical ? { bottom: `${offset}%` } : { left: `${offset}%` };
-    return <div {...restProps} className={className} style={assign({}, style, handleStyle)} />;
+
+    const elStyle = {
+      ...style,
+      ...handleStyle,
+    };
+    return <div {...restProps} className={className} style={elStyle} />;
   }
 }
 
diff --git a/src/common/Track.jsx b/src/common/Track.jsx
index 52f3d7b5d..920b43de8 100644
--- a/src/common/Track.jsx
+++ b/src/common/Track.jsx
@@ -1,5 +1,4 @@
 import React from 'react';
-import assign from 'object-assign';
 
 const Track = ({
   className, included, vertical, offset, length, minimumTrackStyle,
@@ -14,8 +13,11 @@ const Track = ({
     style.left = `${offset}%`;
     style.width = `${length}%`;
   }
-
-  return <div className={className} style={assign({}, style, minimumTrackStyle)} />;
+  const elStyle = {
+    ...style,
+    ...minimumTrackStyle,
+  };
+  return <div className={className} style={elStyle} />;
 };
 
 export default Track;