diff --git a/examples/basic/app.js b/examples/basic/app.js
index 9d9282d..7fdf7eb 100644
--- a/examples/basic/app.js
+++ b/examples/basic/app.js
@@ -1,7 +1,7 @@
 import React from 'react';
 import FlipCard from '../../lib/main';
 
-var App = React.createClass({
+let App = React.createClass({
   getInitialState() {
     return {
       isFlipped: false
@@ -54,7 +54,7 @@ var App = React.createClass({
           </div>
           <div>Back</div>
         </FlipCard>
-        
+
         {/*
           The `disabled` attribute allows turning off the auto-flip
           on hover, or focus. This allows manual control over flipping.
diff --git a/lib/components/FlipCard.js b/lib/components/FlipCard.js
index db9a2be..bda421f 100644
--- a/lib/components/FlipCard.js
+++ b/lib/components/FlipCard.js
@@ -16,7 +16,7 @@ export default React.createClass({
     onFlip: PropTypes.func,
     onKeyDown: PropTypes.func,
     children(props, propName, componentName) {
-      var prop = props[propName];
+      let prop = props[propName];
 
       if (React.Children.count(prop) !== 2) {
         return new Error(
@@ -52,7 +52,7 @@ export default React.createClass({
     setTimeout(() => {
       this.setState({
         isFlipped: newProps.flipped
-      })
+      });
     }, 0);
   },
 
@@ -68,7 +68,7 @@ export default React.createClass({
     // If isFlipped has changed need to notify
     if (this.state.isFlipped !== nextState.isFlipped) {
       this.notifyFlip = true;
-    } 
+    }
   },
 
   componentDidUpdate() {
@@ -82,6 +82,7 @@ export default React.createClass({
       this.focusElement = null;
     }
     // Direct focus to the back if needed
+    /* eslint brace-style:0 */
     else if (this.focusBack) {
       this.refs.back.getDOMNode().focus();
       this.focusBack = false;
@@ -139,7 +140,7 @@ export default React.createClass({
     }
   },
 
-  render() {  
+  render() {
     return (
       <div
         className={cx({
diff --git a/lib/components/__tests__/FlipCard-test.js b/lib/components/__tests__/FlipCard-test.js
index fc10751..1d41108 100644
--- a/lib/components/__tests__/FlipCard-test.js
+++ b/lib/components/__tests__/FlipCard-test.js
@@ -1,17 +1,18 @@
-var React = require('react/addons');
-var TestUtils = React.addons.TestUtils;
-var FlipCard = require('../../main');
-var { ok, equal, strictEqual, throws } = require('assert');
+let React = require('react/addons');
+let TestUtils = React.addons.TestUtils;
+let FlipCard = require('../../main');
+let { equal, throws } = require('assert');
 
-describe('react-flipcard', function () {
-  it('should throw an error if less than 2 children are provided', function () {
-    throws(function () {
+/* eslint func-names:0 */
+describe('react-flipcard', function() {
+  it('should throw an error if less than 2 children are provided', function() {
+    throws(function() {
       TestUtils.renderIntoDocument(<FlipCard/>);
     }, TypeError);
   });
 
-  it('should flip vertically', function () {
-    var card = TestUtils.renderIntoDocument(
+  it('should flip vertically', function() {
+    let card = TestUtils.renderIntoDocument(
       <FlipCard type="vertical">
         <div>foo</div>
         <div>bar</div>
@@ -20,9 +21,9 @@ describe('react-flipcard', function () {
     equal(card.getDOMNode().classList.contains('ReactFlipCard--vertical'), true);
     equal(card.getDOMNode().classList.contains('ReactFlipCard--horizontal'), false);
   });
-  
-  it('should flip horizontally by default', function () {
-    var card = TestUtils.renderIntoDocument(
+
+  it('should flip horizontally by default', function() {
+    let card = TestUtils.renderIntoDocument(
       <FlipCard>
         <div>foo</div>
         <div>bar</div>
@@ -32,8 +33,8 @@ describe('react-flipcard', function () {
     equal(card.getDOMNode().classList.contains('ReactFlipCard--horizontal'), true);
   });
 
-  it('should default to enabled', function () {
-    var card = TestUtils.renderIntoDocument(
+  it('should default to enabled', function() {
+    let card = TestUtils.renderIntoDocument(
       <FlipCard>
         <div>foo</div>
         <div>bar</div>
@@ -41,9 +42,9 @@ describe('react-flipcard', function () {
     );
     equal(card.getDOMNode().classList.contains('ReactFlipCard--enabled'), true);
   });
-  
-  it('should allow disabling', function () {
-    var card = TestUtils.renderIntoDocument(
+
+  it('should allow disabling', function() {
+    let card = TestUtils.renderIntoDocument(
       <FlipCard disabled={true}>
         <div>foo</div>
         <div>bar</div>
@@ -51,7 +52,7 @@ describe('react-flipcard', function () {
     );
     equal(card.getDOMNode().classList.contains('ReactFlipCard--enabled'), false);
   });
-  
+
   // TODO: Why doesn't this work?
   // it('should call onFlip', function (done) {
   //   var called = false;
diff --git a/lib/helpers/classSet.js b/lib/helpers/classSet.js
index 9226c35..7223186 100644
--- a/lib/helpers/classSet.js
+++ b/lib/helpers/classSet.js
@@ -1,9 +1,11 @@
 module.exports = function classSet(classNames) {
-  if (typeof classNames == 'object') {
-    return Object.keys(classNames).filter(function(className) {
+  let result = null;
+  if (typeof classNames === 'object') {
+    result = Object.keys(classNames).filter((className) => {
       return classNames[className];
     }).join(' ');
   } else {
-    return Array.prototype.join.call(arguments, ' ');
+    result = Array.prototype.join.call(arguments, ' ');
   }
+  return result;
 };
diff --git a/lib/helpers/contains.js b/lib/helpers/contains.js
index 2d03372..1f173bf 100644
--- a/lib/helpers/contains.js
+++ b/lib/helpers/contains.js
@@ -1,4 +1,5 @@
 // Checks to see if a parent element contains a child element
+/* eslint no-param-reassign:0, no-cond-assign:0 */
 module.exports = function contains(parent, child) {
   do {
     if (parent === child) {
diff --git a/lib/helpers/injectStyle.js b/lib/helpers/injectStyle.js
index bc76b49..80a4dfb 100644
--- a/lib/helpers/injectStyle.js
+++ b/lib/helpers/injectStyle.js
@@ -1,4 +1,4 @@
-var CSS = `
+const CSS = `
 .ReactFlipCard {
   -webkit-perspective: 1000;
   -moz-perspective: 1000;
@@ -7,8 +7,8 @@ var CSS = `
 
   -ms-transform: perspective(1000px);
   -moz-transform: perspective(1000px);
-  -moz-transform-style: preserve-3d; 
-  -ms-transform-style: preserve-3d; 
+  -moz-transform-style: preserve-3d;
+  -ms-transform-style: preserve-3d;
 
   display: inline-block;
 }
@@ -30,7 +30,7 @@ var CSS = `
   -ms-transform: rotateY(180deg);
   -o-transform: rotateY(180deg);
   transform: rotateY(180deg);
-}	
+}
 /* END: Accommodating for IE */
 
 .ReactFlipCard__Flipper {
@@ -138,13 +138,13 @@ var CSS = `
 /* END: Accommodating for IE */
 `;
 
-export default function () {
-  var style = document.getElementById('react-flipcard-style');
+export default function() {
+  let style = document.getElementById('react-flipcard-style');
   if (!style) {
     style = document.createElement('style');
     style.setAttribute('id', 'react-flipcard-style');
-    var head = document.querySelector('head');
+    let head = document.querySelector('head');
     head.insertBefore(style, head.firstChild);
   }
   style.innerHTML = CSS;
-};
+}
diff --git a/package.json b/package.json
index 8bfaba2..f90a416 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,8 @@
   "description": "React flip card component",
   "main": "lib/main.js",
   "scripts": {
-    "test": "rackt test --ci --browsers Firefox",
-    "start": "rackt dev"
+    "test": "rackt test --single-run --browsers Firefox",
+    "start": "rackt server"
   },
   "repository": {
     "type": "git",
@@ -21,10 +21,10 @@
   },
   "homepage": "https://github.com/mzabriskie/react-flipcard",
   "devDependencies": {
-    "rackt-cli": "^0.3.2",
+    "rackt-cli": "^0.4.0",
     "react": "^0.13.3"
   },
   "peerDependencies": {
     "react": "^0.13.3"
   }
-}
\ No newline at end of file
+}