diff --git a/package.json b/package.json
index 3ae3cd7..9f2aae5 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,7 @@
     "bluebird": "^3.5.3",
     "jsdoc": "^3.5.5",
     "opencv4nodejs": "^4.14.1",
+    "pngjs": "^3.4.0",
     "semantic-release": "^15.13.3",
     "xo": "^0.24.0"
   },
diff --git a/test/examples/simple-example.js b/test/examples/simple-example.js
index 121288c..4d59aa6 100644
--- a/test/examples/simple-example.js
+++ b/test/examples/simple-example.js
@@ -1,15 +1,14 @@
 // Tfjs does not provide any read/write manipulation
 // function on nodejs, so we nee to to this with pngjs
-
-const {PNG} = require('pngjs');
 const fs = require('fs');
+const {PNG} = require('pngjs');
 
 const fileToTensor = function (filename) {
 	return new Promise((resolve, reject) => {
 		const inputPng = new PNG();
 		fs.createReadStream(filename)
-		  .pipe(inputPng)
-		  .on('parsed', () => {
+			.pipe(inputPng)
+			.on('parsed', () => {
 				const images = tf.tensor4d(inputPng.data, [1, inputPng.height, inputPng.width, 4]);
 				resolve({images});
 			})