diff --git a/package.json b/package.json
index d14f169..e2cb479 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "webpack": "^1.13.2",
     "webpack-cleanup-plugin": "^0.4.0",
     "webpack-dev-server": "^1.16.1",
-    "react-dom": "^15.0.0"
+    "react-dom": "^15.0.0",
+    "prop-types": "^15.7.2",
   }
 }
diff --git a/src/index.js b/src/index.js
index f8036c1..b1c6d22 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,5 @@
 import React, { Component } from 'react';
+import PropTypes from 'prop-types;
 
 class ScratchCard extends Component {
 
@@ -155,11 +156,11 @@ class ScratchCard extends Component {
 }
 
 ScratchCard.propTypes = {
-  image: React.PropTypes.string.isRequired,
-  width: React.PropTypes.number.isRequired,
-  height: React.PropTypes.number.isRequired,
-  finishPercent: React.PropTypes.number.isRequired,
-  onComplete: React.PropTypes.func
+  image: PropTypes.string.isRequired,
+  width: PropTypes.number.isRequired,
+  height: PropTypes.number.isRequired,
+  finishPercent: PropTypes.number.isRequired,
+  onComplete: PropTypes.func
 }
 
 export default ScratchCard;