diff --git a/js/blast-main.js b/js/blast-main.js
index 7a545f7..06705c0 100644
--- a/js/blast-main.js
+++ b/js/blast-main.js
@@ -5,18 +5,18 @@
  *
  * @author Sam Reid
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var BlastScreen = require( 'BLAST/blast/BlastScreen' );
-  var Property = require( 'AXON/Property' );
-  var Sim = require( 'JOIST/Sim' );
-  var SimLauncher = require( 'JOIST/SimLauncher' );
-  var Tandem = require( 'TANDEM/Tandem' );
+  const BlastScreen = require( 'BLAST/blast/BlastScreen' );
+  const Property = require( 'AXON/Property' );
+  const Sim = require( 'JOIST/Sim' );
+  const SimLauncher = require( 'JOIST/SimLauncher' );
+  const Tandem = require( 'TANDEM/Tandem' );
 
   // strings
-  var blastTitleString = require( 'string!BLAST/blast.title' );
+  const blastTitleString = require( 'string!BLAST/blast.title' );
 
   SimLauncher.launch( function() {
 
diff --git a/js/blast.js b/js/blast.js
index 38551ce..465ad99 100644
--- a/js/blast.js
+++ b/js/blast.js
@@ -5,11 +5,11 @@
  *
  * @author Chris Malley (PixelZoom, Inc.)
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var Namespace = require( 'PHET_CORE/Namespace' );
+  const Namespace = require( 'PHET_CORE/Namespace' );
 
   return new Namespace( 'blast' );
 } );
\ No newline at end of file
diff --git a/js/blast/BlastScreen.js b/js/blast/BlastScreen.js
index cae9616..170722f 100644
--- a/js/blast/BlastScreen.js
+++ b/js/blast/BlastScreen.js
@@ -5,16 +5,16 @@
  *
  * @author John Blanco
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var blast = require( 'BLAST/blast' );
-  var BlastModel = require( 'BLAST/blast/model/BlastModel' );
-  var BlastScreenView = require( 'BLAST/blast/view/BlastScreenView' );
-  var inherit = require( 'PHET_CORE/inherit' );
-  var Rectangle = require( 'SCENERY/nodes/Rectangle' );
-  var Screen = require( 'JOIST/Screen' );
+  const blast = require( 'BLAST/blast' );
+  const BlastModel = require( 'BLAST/blast/model/BlastModel' );
+  const BlastScreenView = require( 'BLAST/blast/view/BlastScreenView' );
+  const inherit = require( 'PHET_CORE/inherit' );
+  const Rectangle = require( 'SCENERY/nodes/Rectangle' );
+  const Screen = require( 'JOIST/Screen' );
 
   /**
    * @param {Tandem} tandem
diff --git a/js/blast/model/BlastModel.js b/js/blast/model/BlastModel.js
index 7936669..7ebfc69 100644
--- a/js/blast/model/BlastModel.js
+++ b/js/blast/model/BlastModel.js
@@ -5,13 +5,13 @@
  *
  * @author Sam Reid
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var blast = require( 'BLAST/blast' );
-  var inherit = require( 'PHET_CORE/inherit' );
-  var Particle = require( 'BLAST/blast/model/Particle' );
+  const blast = require( 'BLAST/blast' );
+  const inherit = require( 'PHET_CORE/inherit' );
+  const Particle = require( 'BLAST/blast/model/Particle' );
 
   /**
    * @param {Tandem} tandem
diff --git a/js/blast/model/Particle.js b/js/blast/model/Particle.js
index 442a17b..82bc3ab 100644
--- a/js/blast/model/Particle.js
+++ b/js/blast/model/Particle.js
@@ -5,13 +5,13 @@
  *
  * @author Sam Reid
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var blast = require( 'BLAST/blast' );
-  var inherit = require( 'PHET_CORE/inherit' );
-  var NumberProperty = require( 'AXON/NumberProperty' );
+  const blast = require( 'BLAST/blast' );
+  const inherit = require( 'PHET_CORE/inherit' );
+  const NumberProperty = require( 'AXON/NumberProperty' );
 
   /**
    * @constructor
diff --git a/js/blast/view/BlastScreenView.js b/js/blast/view/BlastScreenView.js
index 2936071..9706941 100644
--- a/js/blast/view/BlastScreenView.js
+++ b/js/blast/view/BlastScreenView.js
@@ -5,14 +5,14 @@
  *
  * @author Sam Reid
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var blast = require( 'BLAST/blast' );
-  var inherit = require( 'PHET_CORE/inherit' );
-  var ParticleNode = require( 'BLAST/blast/view/ParticleNode' );
-  var ScreenView = require( 'JOIST/ScreenView' );
+  const blast = require( 'BLAST/blast' );
+  const inherit = require( 'PHET_CORE/inherit' );
+  const ParticleNode = require( 'BLAST/blast/view/ParticleNode' );
+  const ScreenView = require( 'JOIST/ScreenView' );
 
   /**
    * @param {BlastModel} model
diff --git a/js/blast/view/ParticleNode.js b/js/blast/view/ParticleNode.js
index 4b9360e..cbcc5d2 100644
--- a/js/blast/view/ParticleNode.js
+++ b/js/blast/view/ParticleNode.js
@@ -5,13 +5,13 @@
  *
  * @author Sam Reid
  */
-define( function( require ) {
+define( require => {
   'use strict';
 
   // modules
-  var blast = require( 'BLAST/blast' );
-  var inherit = require( 'PHET_CORE/inherit' );
-  var Rectangle = require( 'SCENERY/nodes/Rectangle' );
+  const blast = require( 'BLAST/blast' );
+  const inherit = require( 'PHET_CORE/inherit' );
+  const Rectangle = require( 'SCENERY/nodes/Rectangle' );
 
   // constants
   var PARTICLE_SIZE = 10;