diff --git a/js/common/PHScaleColors.js b/js/common/PHScaleColors.js
index f18f369d..6884453f 100644
--- a/js/common/PHScaleColors.js
+++ b/js/common/PHScaleColors.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * Colors used throughout this sim.
diff --git a/js/common/PHScaleConstants.js b/js/common/PHScaleConstants.js
index b2b4d78a..1bb7c35d 100644
--- a/js/common/PHScaleConstants.js
+++ b/js/common/PHScaleConstants.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * Constants used throughout this sim.
diff --git a/js/common/view/SoluteComboBox.js b/js/common/view/SoluteComboBox.js
index 8e02636c..1ac156e3 100644
--- a/js/common/view/SoluteComboBox.js
+++ b/js/common/view/SoluteComboBox.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * Combo box for choosing a solute (stock solution).
diff --git a/js/macro/MacroScreen.js b/js/macro/MacroScreen.js
index 98395fff..83db5b29 100644
--- a/js/macro/MacroScreen.js
+++ b/js/macro/MacroScreen.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * The 'Macro' screen.
diff --git a/js/micro/MicroScreen.js b/js/micro/MicroScreen.js
index b2b5ec1f..afb68e43 100644
--- a/js/micro/MicroScreen.js
+++ b/js/micro/MicroScreen.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * The 'Micro' screen.
diff --git a/js/mysolution/MySolutionScreen.js b/js/mysolution/MySolutionScreen.js
index be5b5d72..b566ed6c 100644
--- a/js/mysolution/MySolutionScreen.js
+++ b/js/mysolution/MySolutionScreen.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * The 'My Solution' screen.
diff --git a/js/ph-scale-main.js b/js/ph-scale-main.js
index 16efc0e8..55d3534f 100644
--- a/js/ph-scale-main.js
+++ b/js/ph-scale-main.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * Main entry point for the 'pH Scale' sim.