diff --git a/src/index.js b/src/index.js
index 7c204c0..042836f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,7 @@
 import hljs from 'highlight.js';
 import React from 'react';
 
-class Highlight extends React.Component {
+class Highlight extends React.PureComponent {
     constructor(props) {
       super(props)
       this.setEl = this.setEl.bind(this)
diff --git a/src/optimized.js b/src/optimized.js
index e97f670..c45a321 100644
--- a/src/optimized.js
+++ b/src/optimized.js
@@ -1,7 +1,7 @@
 import hljs from'highlight.js/lib/highlight';
 import React from'react';
 
-class Highlight extends React.Component {
+class Highlight extends React.PureComponent {
     componentDidMount() {
         this.highlightCode();
     }