diff --git a/build/stats.module.js b/build/stats.module.js
index 8a3edfd..2be8ef3 100644
--- a/build/stats.module.js
+++ b/build/stats.module.js
@@ -2,11 +2,11 @@
  * @author mrdoob / http://mrdoob.com/
  */
 
-var Stats = function () {
+let Stats = function () {
 
-	var mode = 0;
+	let mode = 0;
 
-	var container = document.createElement( 'div' );
+	let container = document.createElement( 'div' );
 	container.style.cssText = 'position:fixed;top:0;left:0;cursor:pointer;opacity:0.9;z-index:10000';
 	container.addEventListener( 'click', function ( event ) {
 
@@ -26,7 +26,7 @@ var Stats = function () {
 
 	function showPanel( id ) {
 
-		for ( var i = 0; i < container.children.length; i ++ ) {
+		for ( let i = 0; i < container.children.length; i ++ ) {
 
 			container.children[ i ].style.display = i === id ? 'block' : 'none';
 
@@ -38,14 +38,14 @@ var Stats = function () {
 
 	//
 
-	var beginTime = ( performance || Date ).now(), prevTime = beginTime, frames = 0;
+	let beginTime = ( performance || Date ).now(), prevTime = beginTime, frames = 0;
 
-	var fpsPanel = addPanel( new Stats.Panel( 'FPS', '#0ff', '#002' ) );
-	var msPanel = addPanel( new Stats.Panel( 'MS', '#0f0', '#020' ) );
+	let fpsPanel = addPanel( new Stats.Panel( 'FPS', '#0ff', '#002' ) );
+	let msPanel = addPanel( new Stats.Panel( 'MS', '#0f0', '#020' ) );
 
 	if ( self.performance && self.performance.memory ) {
 
-		var memPanel = addPanel( new Stats.Panel( 'MB', '#f08', '#201' ) );
+		let memPanel = addPanel( new Stats.Panel( 'MB', '#f08', '#201' ) );
 
 	}
 
@@ -70,7 +70,7 @@ var Stats = function () {
 
 			frames ++;
 
-			var time = ( performance || Date ).now();
+			let time = ( performance || Date ).now();
 
 			msPanel.update( time - beginTime, 200 );
 
@@ -83,7 +83,7 @@ var Stats = function () {
 
 				if ( memPanel ) {
 
-					var memory = performance.memory;
+					let memory = performance.memory;
 					memPanel.update( memory.usedJSHeapSize / 1048576, memory.jsHeapSizeLimit / 1048576 );
 
 				}
@@ -111,20 +111,20 @@ var Stats = function () {
 
 Stats.Panel = function ( name, fg, bg ) {
 
-	var min = Infinity, max = 0, round = Math.round;
-	var PR = round( window.devicePixelRatio || 1 );
+	let min = Infinity, max = 0, round = Math.round;
+	let PR = round( window.devicePixelRatio || 1 );
 
-	var WIDTH = 80 * PR, HEIGHT = 48 * PR,
+	let WIDTH = 80 * PR, HEIGHT = 48 * PR,
 			TEXT_X = 3 * PR, TEXT_Y = 2 * PR,
 			GRAPH_X = 3 * PR, GRAPH_Y = 15 * PR,
 			GRAPH_WIDTH = 74 * PR, GRAPH_HEIGHT = 30 * PR;
 
-	var canvas = document.createElement( 'canvas' );
+	let canvas = document.createElement( 'canvas' );
 	canvas.width = WIDTH;
 	canvas.height = HEIGHT;
 	canvas.style.cssText = 'width:80px;height:48px';
 
-	var context = canvas.getContext( '2d' );
+	let context = canvas.getContext( '2d' );
 	context.font = 'bold ' + ( 9 * PR ) + 'px Helvetica,Arial,sans-serif';
 	context.textBaseline = 'top';