diff --git a/src/wp-includes/Text/Diff.php b/src/wp-includes/Text/Diff.php
index 6f76278c5a..d842213852 100644
--- a/src/wp-includes/Text/Diff.php
+++ b/src/wp-includes/Text/Diff.php
@@ -10,7 +10,7 @@
  * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @package Text_Diff
  * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
diff --git a/src/wp-includes/Text/Diff/Engine/native.php b/src/wp-includes/Text/Diff/Engine/native.php
index 5824329b7f..c7fa1c7b72 100644
--- a/src/wp-includes/Text/Diff/Engine/native.php
+++ b/src/wp-includes/Text/Diff/Engine/native.php
@@ -6,7 +6,7 @@
  *
  * The algorithm used here is mostly lifted from the perl module
  * Algorithm::Diff (version 1.06) by Ned Konz, which is available at:
- * http://www.perl.com/CPAN/authors/id/N/NE/NEDKONZ/Algorithm-Diff-1.06.zip
+ * https://cpan.metacpan.org/authors/id/N/NE/NEDKONZ/Algorithm-Diff-1.06.zip
  *
  * More ideas are taken from: http://www.ics.uci.edu/~eppstein/161/960229.html
  *
@@ -21,7 +21,7 @@
  * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
  * @package Text_Diff
diff --git a/src/wp-includes/Text/Diff/Engine/shell.php b/src/wp-includes/Text/Diff/Engine/shell.php
index a2ccc70db8..9bf0b417cc 100644
--- a/src/wp-includes/Text/Diff/Engine/shell.php
+++ b/src/wp-includes/Text/Diff/Engine/shell.php
@@ -8,7 +8,7 @@
  * Copyright 2007-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @author  Milian Wolff <mail@milianw.de>
  * @package Text_Diff
diff --git a/src/wp-includes/Text/Diff/Engine/string.php b/src/wp-includes/Text/Diff/Engine/string.php
index 76a111158c..434ce32945 100644
--- a/src/wp-includes/Text/Diff/Engine/string.php
+++ b/src/wp-includes/Text/Diff/Engine/string.php
@@ -14,7 +14,7 @@
  * Copyright 2005-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @author  Örjan Persson <o@42mm.org>
  * @package Text_Diff
diff --git a/src/wp-includes/Text/Diff/Engine/xdiff.php b/src/wp-includes/Text/Diff/Engine/xdiff.php
index 02ce848078..27a7db8ee8 100644
--- a/src/wp-includes/Text/Diff/Engine/xdiff.php
+++ b/src/wp-includes/Text/Diff/Engine/xdiff.php
@@ -8,7 +8,7 @@
  * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @author  Jon Parise <jon@horde.org>
  * @package Text_Diff
diff --git a/src/wp-includes/Text/Diff/Renderer.php b/src/wp-includes/Text/Diff/Renderer.php
index 712d985a8e..dcd536609a 100644
--- a/src/wp-includes/Text/Diff/Renderer.php
+++ b/src/wp-includes/Text/Diff/Renderer.php
@@ -8,7 +8,7 @@
  * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @package Text_Diff
  */
diff --git a/src/wp-includes/Text/Diff/Renderer/inline.php b/src/wp-includes/Text/Diff/Renderer/inline.php
index 392bd57cff..72880cc53e 100644
--- a/src/wp-includes/Text/Diff/Renderer/inline.php
+++ b/src/wp-includes/Text/Diff/Renderer/inline.php
@@ -5,7 +5,7 @@
  * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
  *
  * See the enclosed file COPYING for license information (LGPL). If you did
- * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
+ * not receive this file, see https://metacpan.org/release/NEDKONZ/Algorithm-Diff-1.06.
  *
  * @author  Ciprian Popovici
  * @package Text_Diff