diff --git a/js/HeaterCoolerFront.ts b/js/HeaterCoolerFront.ts
index a00a5683..326581ec 100644
--- a/js/HeaterCoolerFront.ts
+++ b/js/HeaterCoolerFront.ts
@@ -1,4 +1,4 @@
-// Copyright 2015-2022, University of Colorado Boulder
+// Copyright 2015-2024, University of Colorado Boulder
 
 /**
  * Front of the HeaterCoolerNode.  It is independent from the HeaterCoolerBack so that one can easily layer objects
diff --git a/js/accessibility/GrabDragInteraction.js b/js/accessibility/GrabDragInteraction.js
index e8b009ae..67884a59 100644
--- a/js/accessibility/GrabDragInteraction.js
+++ b/js/accessibility/GrabDragInteraction.js
@@ -1,4 +1,4 @@
-// Copyright 2018-2023, University of Colorado Boulder
+// Copyright 2018-2024, University of Colorado Boulder
 
 /**
  * The main interaction for grabbing and dragging an object through the PDOM and assistive technology. It works by
diff --git a/js/buttons/PlayControlButton.ts b/js/buttons/PlayControlButton.ts
index 7c6c63e6..79f77f2d 100644
--- a/js/buttons/PlayControlButton.ts
+++ b/js/buttons/PlayControlButton.ts
@@ -1,4 +1,4 @@
-// Copyright 2014-2023, University of Colorado Boulder
+// Copyright 2014-2024, University of Colorado Boulder
 
 /**
  * A round toggle button that displays some custom icon when playing and a triangular "Play" icon when not playing.