diff --git a/external/dist/webpack.js b/external/dist/webpack.js
index d1e1f4250..2f3071e1c 100644
--- a/external/dist/webpack.js
+++ b/external/dist/webpack.js
@@ -1,4 +1,4 @@
-/* Copyright 2017 Mozilla Foundation
+/* Copyright 2020 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/src/license_header.js b/src/license_header.js
index d167af68c..ad3387d67 100644
--- a/src/license_header.js
+++ b/src/license_header.js
@@ -1,4 +1,4 @@
-/* Copyright 2019 Mozilla Foundation
+/* Copyright 2020 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/src/license_header_libre.js b/src/license_header_libre.js
index 1aaaf048d..b2a7a28d2 100644
--- a/src/license_header_libre.js
+++ b/src/license_header_libre.js
@@ -2,7 +2,7 @@
  * @licstart The following is the entire license notice for the
  * Javascript code in this page
  *
- * Copyright 2019 Mozilla Foundation
+ * Copyright 2020 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/src/pdf.worker.entry.js b/src/pdf.worker.entry.js
index b6dd4c1fb..1000f6122 100644
--- a/src/pdf.worker.entry.js
+++ b/src/pdf.worker.entry.js
@@ -1,4 +1,4 @@
-/* Copyright 2016 Mozilla Foundation
+/* Copyright 2020 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.