diff --git a/cli/js/custom_event.ts b/cli/js/custom_event.ts
index 922abd4b17..2d94df56de 100644
--- a/cli/js/custom_event.ts
+++ b/cli/js/custom_event.ts
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types.ts";
 import * as event from "./event.ts";
 import { getPrivateValue, requiredArguments } from "./util.ts";
diff --git a/cli/js/custom_event_test.ts b/cli/js/custom_event_test.ts
index 4d2eb2c16f..a5b649812e 100644
--- a/cli/js/custom_event_test.ts
+++ b/cli/js/custom_event_test.ts
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { test, assertEquals } from "./test_util.ts";
 
 test(function customEventInitializedWithDetail(): void {
diff --git a/core/isolate.rs b/core/isolate.rs
index d2822e2b9a..9c4595eb07 100644
--- a/core/isolate.rs
+++ b/core/isolate.rs
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 // Do not add any dependency to modules.rs!
 // modules.rs is complex and should remain decoupled from isolate.rs to keep the
diff --git a/core/libdeno/modules.cc b/core/libdeno/modules.cc
index bb7dc5d980..9ccdbcadbd 100644
--- a/core/libdeno/modules.cc
+++ b/core/libdeno/modules.cc
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 #include "exceptions.h"
 #include "internal.h"
 
diff --git a/core/modules.rs b/core/modules.rs
index bab701840f..0248e338d6 100644
--- a/core/modules.rs
+++ b/core/modules.rs
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 // Implementation note: one could imagine combining this module with Isolate to
 // provide a more intuitive high-level API. However, due to the complexity
diff --git a/core/shared_queue.rs b/core/shared_queue.rs
index dbb738f15d..2bb0f69a5b 100644
--- a/core/shared_queue.rs
+++ b/core/shared_queue.rs
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 /*
 SharedQueue Binary Layout
 +-------------------------------+-------------------------------+
diff --git a/tools/format.py b/tools/format.py
index ac60358048..165e2ac71e 100755
--- a/tools/format.py
+++ b/tools/format.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# Copyright 2018 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import os
 import sys
 import argparse