diff --git a/tests/types.out b/tests/types.out
index be91ae04441e334a5831f71649b2ebd26055748d..37508705181b909041f7019e627339256a3b37c0 100644
--- a/tests/types.out
+++ b/tests/types.out
@@ -1,4 +1,4 @@
-// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
 /// <reference no-default-lib="true" />
 /// <reference lib="esnext" />
diff --git a/tools/ts_library_builder/build_library.ts b/tools/ts_library_builder/build_library.ts
index 0717de9874a34480d8d0c46221bb35d62f1107c5..286d13d113a29758df06816c24c7fa6387d38611 100644
--- a/tools/ts_library_builder/build_library.ts
+++ b/tools/ts_library_builder/build_library.ts
@@ -58,7 +58,7 @@ const { ModuleKind, ModuleResolutionKind, ScriptTarget } = ts;
  * A preamble which is appended to the start of the library.
  */
 // tslint:disable-next-line:max-line-length
-const libPreamble = `// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+const libPreamble = `// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
 /// <reference no-default-lib="true" />
 /// <reference lib="esnext" />