diff --git a/.rustfmt.toml b/.rustfmt.toml
index ea036b878a95374070ed8ec5be38073a549207cf..8b888c2328b78f358e7746141dd86b5809fd3e44 100644
--- a/.rustfmt.toml
+++ b/.rustfmt.toml
@@ -1,4 +1,4 @@
-# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 max_width = 80
 tab_spaces = 2
 edition = "2018"
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
index 5a671244de937cfc449c42d48da7867e4f0a7852..1308edcb65843effdb1697aa300c2a8ceda96ee6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018-2019 the Deno authors
+Copyright (c) 2018-2020 the Deno authors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/cli/js/compiler_api.ts b/cli/js/compiler_api.ts
index 487807d66e9308131ad015356ddd457e5eb6bd06..dc81f34abadbee594b8d239698fa02f1204b9798 100644
--- a/cli/js/compiler_api.ts
+++ b/cli/js/compiler_api.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 // This file contains the runtime APIs which will dispatch work to the internal
 // compiler within Deno.
diff --git a/cli/js/compiler_api_test.ts b/cli/js/compiler_api_test.ts
index 802fa6d46302139894e2091e027327d7b5dd34ee..8d7bf57d378ce741f6bc8f98772b627791814985 100644
--- a/cli/js/compiler_api_test.ts
+++ b/cli/js/compiler_api_test.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { assert, assertEquals, test } from "./test_util.ts";
 
diff --git a/cli/js/compiler_host.ts b/cli/js/compiler_host.ts
index 576273bbdbdfae1d8e910df1adc9f41fbcfabe9a..3e6df44856a7a9a8ecb6a9eb5147d22c829bce45 100644
--- a/cli/js/compiler_host.ts
+++ b/cli/js/compiler_host.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { MediaType, SourceFile } from "./compiler_sourcefile.ts";
 import { OUT_DIR, WriteFileCallback } from "./compiler_util.ts";
diff --git a/cli/js/compiler_imports.ts b/cli/js/compiler_imports.ts
index d861f8ddc8de939adb307a5fdfea92539716d33d..042c0a1ae6b7616e895a1f3b3db9a2485f21a809 100644
--- a/cli/js/compiler_imports.ts
+++ b/cli/js/compiler_imports.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import {
   MediaType,
diff --git a/cli/js/compiler_sourcefile.ts b/cli/js/compiler_sourcefile.ts
index 21cece3873afbad5ee4669457846922ef104f5ee..8e81cdb456f0219ea500f83bf2eb07e34e54c049 100644
--- a/cli/js/compiler_sourcefile.ts
+++ b/cli/js/compiler_sourcefile.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import {
   getMappedModuleName,
diff --git a/cli/js/compiler_util.ts b/cli/js/compiler_util.ts
index 30c6f61629fcffa9d5bf4ff3cf5d088cf56786dd..bff3bcd51047232701e92d5909e9d5c64dc3d0b4 100644
--- a/cli/js/compiler_util.ts
+++ b/cli/js/compiler_util.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { bold, cyan, yellow } from "./colors.ts";
 import { CompilerOptions } from "./compiler_api.ts";
diff --git a/cli/js/diagnostics_util.ts b/cli/js/diagnostics_util.ts
index cc384ebb0f7f6b39b9f4720300fb6b747aa7a271..f7d0f5b72bcd96749f195dffdcb5e3a648b5c9a3 100644
--- a/cli/js/diagnostics_util.ts
+++ b/cli/js/diagnostics_util.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 // These utilities are used by compiler.ts to format TypeScript diagnostics
 // into Deno Diagnostics.
diff --git a/cli/js/mixins/dom_iterable.ts b/cli/js/mixins/dom_iterable.ts
index aec4e7aa0173208a31c313a56ca27da9a92475bc..976d81be79f6a07598be0a9940fb3be85eb63678 100644
--- a/cli/js/mixins/dom_iterable.ts
+++ b/cli/js/mixins/dom_iterable.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { DomIterable } from "../dom_types.ts";
 import { requiredArguments } from "../util.ts";
diff --git a/cli/js/mixins/dom_iterable_test.ts b/cli/js/mixins/dom_iterable_test.ts
index 57e65598934f4bdcc8344fe4d1a56ba170afb297..466375d64c3d2c341697b235a40272170df6b485 100644
--- a/cli/js/mixins/dom_iterable_test.ts
+++ b/cli/js/mixins/dom_iterable_test.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { test, assert, assertEquals } from "../test_util.ts";
 
 // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
diff --git a/std/encoding/testdata/cargo.toml b/std/encoding/testdata/cargo.toml
index 291aa7db6d2568def49badefe18c292caaedbe76..11bf7aa70dea6ace323826e6d048da3158a3c7a0 100644
--- a/std/encoding/testdata/cargo.toml
+++ b/std/encoding/testdata/cargo.toml
@@ -1,4 +1,4 @@
-# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 # Dummy package info required by `cargo fetch`.
 # Use tools/sync_third_party.py to install deps after editing this file.
 # Deno does not build with cargo. Deno uses a build system called gn.
diff --git a/std/encoding/yaml/dumper/dumper.ts b/std/encoding/yaml/dumper/dumper.ts
index 4ee8e36b4a7568170d75c67d66ec606491237cb4..3a34e14cc7d11977d552723c8b53f1c3d4b19879 100644
--- a/std/encoding/yaml/dumper/dumper.ts
+++ b/std/encoding/yaml/dumper/dumper.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 /* eslint-disable max-len */
 
diff --git a/std/encoding/yaml/dumper/dumper_state.ts b/std/encoding/yaml/dumper/dumper_state.ts
index c2b7608f569221f5b4fa9d37f27fb81f290ca62f..88164a0d235d61e4d42db36b3fb356205fd1fa18 100644
--- a/std/encoding/yaml/dumper/dumper_state.ts
+++ b/std/encoding/yaml/dumper/dumper_state.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Schema, SchemaDefinition } from "../schema.ts";
 import { State } from "../state.ts";
diff --git a/std/encoding/yaml/error.ts b/std/encoding/yaml/error.ts
index 8baf805b57a98fbeacc51039ab74c8757425266a..62be8b477d214142a7948a372783ff171437f65f 100644
--- a/std/encoding/yaml/error.ts
+++ b/std/encoding/yaml/error.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Mark } from "./mark.ts";
 
diff --git a/std/encoding/yaml/example/dump.ts b/std/encoding/yaml/example/dump.ts
index c4282d657ec3c832583dd7c661e0f2f4cda50ec2..746c3be01bf53d43026ffe3454146069cee976e5 100644
--- a/std/encoding/yaml/example/dump.ts
+++ b/std/encoding/yaml/example/dump.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { stringify } from "../../yaml.ts";
 
diff --git a/std/encoding/yaml/example/inout.ts b/std/encoding/yaml/example/inout.ts
index 6a52d808b4b0a36666c7dd46ec3bff6420589a3c..80cad82587159e39dfee1208a3907d77b749c039 100644
--- a/std/encoding/yaml/example/inout.ts
+++ b/std/encoding/yaml/example/inout.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { parse, stringify } from "../../yaml.ts";
 
diff --git a/std/encoding/yaml/example/parse.ts b/std/encoding/yaml/example/parse.ts
index 31d4c88773bee473654959b3c53b00738a55fad8..fc15daf9cfb4000b8323472df22e383ff024118a 100644
--- a/std/encoding/yaml/example/parse.ts
+++ b/std/encoding/yaml/example/parse.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { parse } from "../../yaml.ts";
 
diff --git a/std/encoding/yaml/example/sample_document.ts b/std/encoding/yaml/example/sample_document.ts
index 7b426c142798942794692aeceb680f760743290c..c9372e8ec3974225d638134d14e9f70e7486dad4 100644
--- a/std/encoding/yaml/example/sample_document.ts
+++ b/std/encoding/yaml/example/sample_document.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 /* eslint-disable @typescript-eslint/explicit-function-return-type */
 
 import { parse } from "../../yaml.ts";
diff --git a/std/encoding/yaml/loader/loader.ts b/std/encoding/yaml/loader/loader.ts
index a81395a8e9862b98495c0c8a1ac3ab9f67763285..556bd5b475fcccf57c8b73c2c93d92105db4539e 100644
--- a/std/encoding/yaml/loader/loader.ts
+++ b/std/encoding/yaml/loader/loader.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 /* eslint-disable no-conditional-assignment */
 /* eslint-disable max-len */
diff --git a/std/encoding/yaml/loader/loader_state.ts b/std/encoding/yaml/loader/loader_state.ts
index a316f5031ce913643cb868e713e7f3e7cf59e2f5..1e136025cf3742a8655f9006d7093a8b074f23dc 100644
--- a/std/encoding/yaml/loader/loader_state.ts
+++ b/std/encoding/yaml/loader/loader_state.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { YAMLError } from "../error.ts";
 import { Schema, SchemaDefinition, TypeMap } from "../schema.ts";
diff --git a/std/encoding/yaml/mark.ts b/std/encoding/yaml/mark.ts
index d91e3950dc59fc65a1fd6ba8228ced92427c41bd..44cf175a020f6bfb9e67bfb688fafdaf9d2a7806 100644
--- a/std/encoding/yaml/mark.ts
+++ b/std/encoding/yaml/mark.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { repeat } from "./utils.ts";
 
diff --git a/std/encoding/yaml/parse.ts b/std/encoding/yaml/parse.ts
index aacffe7f92f6bf8a07e6c1263e1ef3c362f29543..2aa0042bdd5f93a9f73258eb3e06ff0eaf582870 100644
--- a/std/encoding/yaml/parse.ts
+++ b/std/encoding/yaml/parse.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { CbFunction, load, loadAll } from "./loader/loader.ts";
 import { LoaderStateOptions } from "./loader/loader_state.ts";
diff --git a/std/encoding/yaml/parse_test.ts b/std/encoding/yaml/parse_test.ts
index ec1b386f967f2114cb72c3bb5ab850452843eb25..b7b742d61b0d9f106436d2950aa09b2042641533 100644
--- a/std/encoding/yaml/parse_test.ts
+++ b/std/encoding/yaml/parse_test.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { parse, parseAll } from "./parse.ts";
 import { test } from "../../testing/mod.ts";
diff --git a/std/encoding/yaml/schema.ts b/std/encoding/yaml/schema.ts
index 715e17359ff2959313a25ffe6b526b7a04c8d3ad..1968e34c1e57f26623bd12a92379bdd41622343a 100644
--- a/std/encoding/yaml/schema.ts
+++ b/std/encoding/yaml/schema.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { YAMLError } from "./error.ts";
 import { KindType, Type } from "./type.ts";
diff --git a/std/encoding/yaml/schema/core.ts b/std/encoding/yaml/schema/core.ts
index b37f4a3358a0752f82807b0e08a85b1d05026e66..82a512a1e1fe9e1145047c647ee7f5542a0f4814 100644
--- a/std/encoding/yaml/schema/core.ts
+++ b/std/encoding/yaml/schema/core.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Schema } from "../schema.ts";
 import { json } from "./json.ts";
diff --git a/std/encoding/yaml/schema/default.ts b/std/encoding/yaml/schema/default.ts
index 6a326cbb2054e1314a9fb9e0fb0a2cbd80c00d49..0fe1dbf1290cfad7b3f320cea0a2cd521c30faeb 100644
--- a/std/encoding/yaml/schema/default.ts
+++ b/std/encoding/yaml/schema/default.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Schema } from "../schema.ts";
 import { binary, merge, omap, pairs, set, timestamp } from "../type/mod.ts";
diff --git a/std/encoding/yaml/schema/failsafe.ts b/std/encoding/yaml/schema/failsafe.ts
index f8892c27d9a08dab956694f83ac5b27eba8a1b89..0fbb74ca9dc19f3b50077370c22aaa10715870bf 100644
--- a/std/encoding/yaml/schema/failsafe.ts
+++ b/std/encoding/yaml/schema/failsafe.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Schema } from "../schema.ts";
 import { map, seq, str } from "../type/mod.ts";
diff --git a/std/encoding/yaml/schema/json.ts b/std/encoding/yaml/schema/json.ts
index 331313237cc51d0890b3b6cf0c2e93b4479241c7..dae469f350c76c155ce61bce050b66396a92ffe4 100644
--- a/std/encoding/yaml/schema/json.ts
+++ b/std/encoding/yaml/schema/json.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Schema } from "../schema.ts";
 import { bool, float, int, nil } from "../type/mod.ts";
diff --git a/std/encoding/yaml/schema/mod.ts b/std/encoding/yaml/schema/mod.ts
index 4eaf30e37cf22a74ce95e7ce85fc298643dee827..7cbe0c283340e60adc2a2233c89e0bb435653f76 100644
--- a/std/encoding/yaml/schema/mod.ts
+++ b/std/encoding/yaml/schema/mod.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 export { core as CORE_SCHEMA } from "./core.ts";
 export { def as DEFAULT_SCHEMA } from "./default.ts";
diff --git a/std/encoding/yaml/state.ts b/std/encoding/yaml/state.ts
index 6c85c7dd323246b55deb8dd6fbed21add7d6ec56..6df6dc04766e250cc65a39f0e6ccff1353e46257 100644
--- a/std/encoding/yaml/state.ts
+++ b/std/encoding/yaml/state.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { SchemaDefinition } from "./schema.ts";
 import { DEFAULT_SCHEMA } from "./schema/mod.ts";
diff --git a/std/encoding/yaml/stringify.ts b/std/encoding/yaml/stringify.ts
index 0e94a18e5346d83a6d0750fc1b9bff11497a75af..f037631d9c85650e8601967a55e4157b5e86eac6 100644
--- a/std/encoding/yaml/stringify.ts
+++ b/std/encoding/yaml/stringify.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { dump } from "./dumper/dumper.ts";
 import { DumperStateOptions } from "./dumper/dumper_state.ts";
diff --git a/std/encoding/yaml/stringify_test.ts b/std/encoding/yaml/stringify_test.ts
index 60b41fd755ce518f6d08eeb22977953d9aeb1b21..ceedb7a3cba5d3a6065e79eb5efb97ba6bc93fcf 100644
--- a/std/encoding/yaml/stringify_test.ts
+++ b/std/encoding/yaml/stringify_test.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { test } from "../../testing/mod.ts";
 import { assertEquals } from "../../testing/asserts.ts";
diff --git a/std/encoding/yaml/type.ts b/std/encoding/yaml/type.ts
index 7f8918d4fd1918f18ebd1e7ca88a4c98daef8de3..4a2c6bbacf280645d77ef6df2e4fddd5b126d023 100644
--- a/std/encoding/yaml/type.ts
+++ b/std/encoding/yaml/type.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { ArrayObject, Any } from "./utils.ts";
 
diff --git a/std/encoding/yaml/type/binary.ts b/std/encoding/yaml/type/binary.ts
index 7c4fc1f06fee12fb1c2cdec3f30c277a51fc5919..8cfe54f7965f8ce56509207c52a8fbb6cc8a8345 100644
--- a/std/encoding/yaml/type/binary.ts
+++ b/std/encoding/yaml/type/binary.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/bool.ts b/std/encoding/yaml/type/bool.ts
index 28e9b2e9ece106d5ef025f87431a9c0d688bdb61..e39823872fab85e3e2a0f794f27b42bcea0505d5 100644
--- a/std/encoding/yaml/type/bool.ts
+++ b/std/encoding/yaml/type/bool.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { isBoolean } from "../utils.ts";
diff --git a/std/encoding/yaml/type/float.ts b/std/encoding/yaml/type/float.ts
index 359a7cc3747193307a4aa28959de9cf0a06de5e0..acb12f5b0088f1d53ea5e4d8f0df0dc5bf26db61 100644
--- a/std/encoding/yaml/type/float.ts
+++ b/std/encoding/yaml/type/float.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { StyleVariant, Type } from "../type.ts";
 import { isNegativeZero, Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/int.ts b/std/encoding/yaml/type/int.ts
index d2ffb1701285e0620719107ba67bcfbd5aecf111..93ec8260e58bdb9b41f8f6ccb9c6e522c6676ace 100644
--- a/std/encoding/yaml/type/int.ts
+++ b/std/encoding/yaml/type/int.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { isNegativeZero, Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/map.ts b/std/encoding/yaml/type/map.ts
index 6d273254d53905b629c1ae8b9203015e009926c0..60e6786572e2e5fd50c1470d43e522b988f29dd6 100644
--- a/std/encoding/yaml/type/map.ts
+++ b/std/encoding/yaml/type/map.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/merge.ts b/std/encoding/yaml/type/merge.ts
index 9389a0d208e20e0970cb18a2d12bc93da83af5dd..77b34025b59232f41253efa43ed3d19136d9c9cc 100644
--- a/std/encoding/yaml/type/merge.ts
+++ b/std/encoding/yaml/type/merge.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 
diff --git a/std/encoding/yaml/type/mod.ts b/std/encoding/yaml/type/mod.ts
index 1970753df71679c1b0c1faa0411d00a8d04f0c33..15f33301ede1ac3cfe982cb8d45fd2841db854ab 100644
--- a/std/encoding/yaml/type/mod.ts
+++ b/std/encoding/yaml/type/mod.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 export { binary } from "./binary.ts";
 export { bool } from "./bool.ts";
diff --git a/std/encoding/yaml/type/nil.ts b/std/encoding/yaml/type/nil.ts
index c7e87f96d8558f7cbd55a6e1de5025f19e1eb13d..00627514ccc97e36e68000c0b8eba2d795da74d6 100644
--- a/std/encoding/yaml/type/nil.ts
+++ b/std/encoding/yaml/type/nil.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 
diff --git a/std/encoding/yaml/type/omap.ts b/std/encoding/yaml/type/omap.ts
index 1b7a79a5061a072fbbc10231b3f6217894565182..541e31df624992454dc6f0af5589c2f452442096 100644
--- a/std/encoding/yaml/type/omap.ts
+++ b/std/encoding/yaml/type/omap.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/pairs.ts b/std/encoding/yaml/type/pairs.ts
index 37f8eb6307fedad59673540f2262c471d17a2c5f..c964524b562a58312d52eb56a33ed587f6ea5897 100644
--- a/std/encoding/yaml/type/pairs.ts
+++ b/std/encoding/yaml/type/pairs.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/seq.ts b/std/encoding/yaml/type/seq.ts
index 32c700b6eb52ad779f98e0d76f66439efb20e9d8..bd7ceb945388ceed1d4309ec425ec70b261cd174 100644
--- a/std/encoding/yaml/type/seq.ts
+++ b/std/encoding/yaml/type/seq.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/set.ts b/std/encoding/yaml/type/set.ts
index 3273223f770d4ab66486f669d248eabe89d405d5..3b7fca0e9695fd468423f171160cde3f793380fd 100644
--- a/std/encoding/yaml/type/set.ts
+++ b/std/encoding/yaml/type/set.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 import { Any } from "../utils.ts";
diff --git a/std/encoding/yaml/type/str.ts b/std/encoding/yaml/type/str.ts
index 8c24e939892949e151efaae62bcacd65c2719f55..c7227743e3fed16fcb8e92c434e5898a52aa5527 100644
--- a/std/encoding/yaml/type/str.ts
+++ b/std/encoding/yaml/type/str.ts
@@ -1,6 +1,6 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 
diff --git a/std/encoding/yaml/type/timestamp.ts b/std/encoding/yaml/type/timestamp.ts
index 38cc9d9400b5718f114d6c607fcaf5807ba6e019..14d24077a887a4fcffb085ab0526a8a05b0f7e4a 100644
--- a/std/encoding/yaml/type/timestamp.ts
+++ b/std/encoding/yaml/type/timestamp.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { Type } from "../type.ts";
 
diff --git a/std/encoding/yaml/utils.ts b/std/encoding/yaml/utils.ts
index 0f2d7abe7f635d750a22fb19ece329b28bc84919..4630a45a27b0f0871bdd10dce760bcfe6baed3cc 100644
--- a/std/encoding/yaml/utils.ts
+++ b/std/encoding/yaml/utils.ts
@@ -1,7 +1,7 @@
 // Ported from js-yaml v3.13.1:
 // https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
 // Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
 export type Any = any;
diff --git a/std/http/testdata/simple_https_server.ts b/std/http/testdata/simple_https_server.ts
index 21d1181cf804f598d8d54e00b2e33004bb176ec8..9330b4172bbdde35cbcc7eb756fdf148b5473669 100644
--- a/std/http/testdata/simple_https_server.ts
+++ b/std/http/testdata/simple_https_server.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 // This is an example of a https server
 import { serveTLS } from "../server.ts";
 
diff --git a/std/http/testdata/simple_server.ts b/std/http/testdata/simple_server.ts
index d53e72dcfcf9fdbf0ca2e6205ff750fc63b732f2..d8ca4cc97bd72ea35fab55e7b283f54d4e3e0b48 100644
--- a/std/http/testdata/simple_server.ts
+++ b/std/http/testdata/simple_server.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 // This is an example of a server that responds with an empty body
 import { serve } from "../server.ts";
 
diff --git a/std/uuid/tests/isNil.ts b/std/uuid/tests/isNil.ts
index 29f0feb624d36a31befdc382dd6e61f2f5ef6d48..dcb10b84d582a0c33984a6f3c3726a78ac8b58f6 100644
--- a/std/uuid/tests/isNil.ts
+++ b/std/uuid/tests/isNil.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { assert } from "../../testing/asserts.ts";
 import { test } from "../../testing/mod.ts";
 // @ts-ignore
diff --git a/std/uuid/tests/v4/generate.ts b/std/uuid/tests/v4/generate.ts
index bc03970d8d19b20f998effa6b90a1f368533bdcf..dfbd90c03b85a12a191b57a006bc6be69b4bb638 100644
--- a/std/uuid/tests/v4/generate.ts
+++ b/std/uuid/tests/v4/generate.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { assert, assertEquals } from "../../../testing/asserts.ts";
 import { test } from "../../../testing/mod.ts";
 import { generate, validate } from "../../v4.ts";
diff --git a/std/uuid/tests/v4/validate.ts b/std/uuid/tests/v4/validate.ts
index 8358be66a5d3f863131b0500902ccd7595f30260..6a8b6655593ecb2a001bf593aa8375bbd68b665f 100644
--- a/std/uuid/tests/v4/validate.ts
+++ b/std/uuid/tests/v4/validate.ts
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { assert } from "../../../testing/asserts.ts";
 import { test } from "../../../testing/mod.ts";
 import { generate, validate } from "../../v4.ts";
diff --git a/tools/hyper_hello/hyper_hello.rs b/tools/hyper_hello/hyper_hello.rs
index bf786abf92d888fb353a02d615c9fc460ced8da0..39d4e55ef27957618081d593eefaa472f604e869 100644
--- a/tools/hyper_hello/hyper_hello.rs
+++ b/tools/hyper_hello/hyper_hello.rs
@@ -1,4 +1,4 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 // Adapted from https://github.com/hyperium/hyper/blob/master/examples/hello.rs
 
 #![deny(warnings)]
diff --git a/tools/throughput_benchmark.py b/tools/throughput_benchmark.py
index f46503193f5b5c03d2743576e1d86584d167c98c..ba80b9909989a9fdf8851976e937fab80c1cc8d7 100755
--- a/tools/throughput_benchmark.py
+++ b/tools/throughput_benchmark.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 # Performs benchmark and append data to //website/data.json.
 # If //website/data.json doesn't exist, this script tries to import it from
 # gh-pages branch.
diff --git a/tools/upload_docs.py b/tools/upload_docs.py
index 7fe8857a6f9a857133ed8364e0da35e72259fbb2..b37ab4e9650dc90b46e0b034c6ca1a48066a6914 100755
--- a/tools/upload_docs.py
+++ b/tools/upload_docs.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import os
 import sys
 from util import run, root_path
diff --git a/tools/util.py b/tools/util.py
index 9a4c0ce02b4453a63635a5cab30c9f7a5c6ddf35..c54158f9b155d428959ff42b1ad6f656d208f3a8 100644
--- a/tools/util.py
+++ b/tools/util.py
@@ -1,4 +1,4 @@
-# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import collections
 import os
 import re
diff --git a/tools/util_test.py b/tools/util_test.py
index b8098e4639a3270505b13b79a38370689e5f1e20..2d67701597a0283e58146bcd95e4f222351745ba 100755
--- a/tools/util_test.py
+++ b/tools/util_test.py
@@ -1,4 +1,4 @@
-# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import os
 
 from test_util import DenoTestCase, run_tests