diff --git a/js/accessibility/AccessibleNumberSpinner.ts b/js/accessibility/AccessibleNumberSpinner.ts
index 4a0f989b..1361d840 100644
--- a/js/accessibility/AccessibleNumberSpinner.ts
+++ b/js/accessibility/AccessibleNumberSpinner.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2022, University of Colorado Boulder
+// Copyright 2018-2023, University of Colorado Boulder
 
 /**
  * A trait for subtypes of Node, used to make the Node behave like a 'number' input with assistive technology.
diff --git a/js/accessibility/AccessibleSlider.ts b/js/accessibility/AccessibleSlider.ts
index 8abcb13e..e7dc69c1 100644
--- a/js/accessibility/AccessibleSlider.ts
+++ b/js/accessibility/AccessibleSlider.ts
@@ -1,4 +1,4 @@
-// Copyright 2017-2022, University of Colorado Boulder
+// Copyright 2017-2023, University of Colorado Boulder
 
 /**
  * A trait for subtypes of Node, used to make the Node behave like a 'slider' with assistive technology. This could be