diff --git a/expat/CMakeLists.txt b/expat/CMakeLists.txt
index ca9e6b9e..bf48e6d1 100644
--- a/expat/CMakeLists.txt
+++ b/expat/CMakeLists.txt
@@ -1,5 +1,36 @@
-# This file is copyrighted under the BSD-license for buildsystem files of KDE
-# copyright 2010, Patrick Spendrin <ps_ml@gmx.de>
+#                          __  __            _
+#                       ___\ \/ /_ __   __ _| |_
+#                      / _ \\  /| '_ \ / _` | __|
+#                     |  __//  \| |_) | (_| | |_
+#                      \___/_/\_\ .__/ \__,_|\__|
+#                               |_| XML parser
+#
+# Copyright (c) 2010      Patrick Spendrin <ps_ml@gmx.de>
+# Copyright (c) 2012      Karl Waclawek <karl@waclawek.net>
+# Copyright (c) 2016-2021 Sebastian Pipping <sebastian@pipping.org>
+# Copyright (c) 2016      Sergei Nikulov <sergey.nikulov@gmail.com>
+# Copyright (c) 2016      Björn Lindahl <bjorn.lindahl@foi.se>
+# Copyright (c) 2016      Tobias Taschner <github@tc84.de>
+# Copyright (c) 2016      Ben Boeckel <ben.boeckel@kitware.com>
+# Copyright (c) 2017      Rhodri James <rhodri@wildebeest.org.uk>
+# Copyright (c) 2017      Rolf Eike Beer <eike@sf-mail.de>
+# Copyright (c) 2017      Stephen Groat <stephen@groat.us>
+# Copyright (c) 2017      Franek Korta <fkorta@gmail.com>
+# Copyright (c) 2018      pedro-vicente <pedro.vicente@space-research.org>
+# Copyright (c) 2018      Frank Rast <frank.rast@gefeg.com>
+# Copyright (c) 2018      userwithuid <userwithuid@gmail.com>
+# Copyright (c) 2018      Yury Gribov <tetra2005@gmail.com>
+# Copyright (c) 2019      Kishore Kunche <kishore.kunche@intel.com>
+# Copyright (c) 2019      xantares <xantares09@hotmail.com>
+# Copyright (c) 2019      Mohammed Khajapasha <mohammed.khajapasha@intel.com>
+# Copyright (c) 2019      David Loffredo <loffredo@steptools.com>
+# Copyright (c) 2019      Bhargava Shastry <bhargava.shastry@ethereum.org>
+# Copyright (c) 2020      Maciej Sroczyński <macieksroczynski@poczta.fm>
+# Copyright (c) 2020      Gulliver <gulliver@traumkristalle.net>
+# Copyright (c) 2020      Thomas Beutlich <tc@tbeu.de>
+# Copyright (c) 2021      Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
+# Unlike most of Expat,
+# this file is copyrighted under the BSD-license for buildsystem files of KDE.
 
 cmake_minimum_required(VERSION 3.1.3)
 
diff --git a/expat/doc/Makefile.am b/expat/doc/Makefile.am
index 16e3eec2..16987e8d 100644
--- a/expat/doc/Makefile.am
+++ b/expat/doc/Makefile.am
@@ -6,7 +6,7 @@
 #                      \___/_/\_\ .__/ \__,_|\__|
 #                               |_| XML parser
 #
-# Copyright (c) 2017-2019 Sebastian Pipping <sebastian@pipping.org>
+# Copyright (c) 2017-2021 Sebastian Pipping <sebastian@pipping.org>
 # Copyright (c) 2017      Stephen Groat <stephen@groat.us>
 # Copyright (c) 2017      Joe Orton <jorton@redhat.com>
 # Licensed under the MIT license:
diff --git a/expat/doc/xmlwf.xml b/expat/doc/xmlwf.xml
index c79041bc..60a4ae00 100644
--- a/expat/doc/xmlwf.xml
+++ b/expat/doc/xmlwf.xml
@@ -1,12 +1,28 @@
+<!--
+                            __  __            _
+                         ___\ \/ /_ __   __ _| |_
+                        / _ \\  /| '_ \ / _` | __|
+                       |  __//  \| |_) | (_| | |_
+                        \___/_/\_\ .__/ \__,_|\__|
+                                 |_| XML parser
+
+   Copyright (c) 2001      Scott Bronson <bronson@rinspin.com>
+   Copyright (c) 2002-2003 Fred L. Drake, Jr. <fdrake@users.sourceforge.net>
+   Copyright (c) 2009      Karl Waclawek <karl@waclawek.net>
+   Copyright (c) 2016-2021 Sebastian Pipping <sebastian@pipping.org>
+   Copyright (c) 2016      Ardo van Rangelrooij <ardo@debian.org>
+   Copyright (c) 2017      Rhodri James <rhodri@wildebeest.org.uk>
+   Copyright (c) 2020      Joe Orton <jorton@redhat.com>
+   Copyright (c) 2021      Tim Bray <tbray@textuality.com>
+   Unlike most of Expat,
+   this file is copyrighted under the GNU Free Documentation License 1.1.
+-->
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
           "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
-  <!-- Fill in your name for FIRSTNAME and SURNAME. -->
   <!ENTITY dhfirstname "<firstname>Scott</firstname>">
   <!ENTITY dhsurname   "<surname>Bronson</surname>">
   <!-- Please adjust the date whenever revising the manpage. -->
   <!ENTITY dhdate      "<date>May 4, 2021</date>">
-  <!-- SECTION should be 1-8, maybe w/ subsection other parameters are
-       allowed: see man(7), man(1). -->
   <!ENTITY dhsection   "<manvolnum>1</manvolnum>">
   <!ENTITY dhemail     "<email>bronson@rinspin.com</email>">
   <!ENTITY dhusername  "Scott Bronson">
diff --git a/expat/win32/expat.iss b/expat/win32/expat.iss
index 0d5533f1..2f25a501 100644
--- a/expat/win32/expat.iss
+++ b/expat/win32/expat.iss
@@ -1,8 +1,40 @@
 ; Basic setup script for the Inno Setup installer builder.  For more
 ; information on the free installer builder, see www.jrsoftware.org.
 ;
-; This script was contributed by Tim Peters.
+; This script was originally contributed by Tim Peters.
 ; It was designed for Inno Setup 2.0.19 but works with later versions as well.
+;
+;                          __  __            _
+;                       ___\ \/ /_ __   __ _| |_
+;                      / _ \\  /| '_ \ / _` | __|
+;                     |  __//  \| |_) | (_| | |_
+;                      \___/_/\_\ .__/ \__,_|\__|
+;                               |_| XML parser
+;
+; Copyright (c) 2001      Tim Peters <tim.peters@gmail.com>
+; Copyright (c) 2001-2005 Fred L. Drake, Jr. <fdrake@users.sourceforge.net>
+; Copyright (c) 2006-2017 Karl Waclawek <karl@waclawek.net>
+; Copyright (c) 2007-2021 Sebastian Pipping <sebastian@pipping.org>
+; Licensed under the MIT license:
+;
+; Permission is  hereby granted,  free of charge,  to any  person obtaining
+; a  copy  of  this  software   and  associated  documentation  files  (the
+; "Software"),  to  deal in  the  Software  without restriction,  including
+; without  limitation the  rights  to use,  copy,  modify, merge,  publish,
+; distribute, sublicense, and/or sell copies of the Software, and to permit
+; persons  to whom  the Software  is  furnished to  do so,  subject to  the
+; following conditions:
+;
+; The above copyright  notice and this permission notice  shall be included
+; in all copies or substantial portions of the Software.
+;
+; THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
+; EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
+; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+; NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+; DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
+; OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+; USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #define expatVer "2.3.0"
 
@@ -11,11 +43,11 @@ AppName=Expat
 AppId=expat
 AppVersion={#expatVer}
 AppVerName=Expat {#expatVer}
-AppCopyright=Copyright © 1998-2017 Thai Open Source Software Center, Clark Cooper, and the Expat maintainers
+AppCopyright=Copyright © 1997-2021 Thai Open Source Software Center, Clark Cooper, and the Expat maintainers
 AppPublisher=The Expat Developers
-AppPublisherURL=http://www.libexpat.org/
-AppSupportURL=http://www.libexpat.org/
-AppUpdatesURL=http://www.libexpat.org/
+AppPublisherURL=https://libexpat.github.io/
+AppSupportURL=https://libexpat.github.io/
+AppUpdatesURL=https://libexpat.github.io/
 UninstallDisplayName=Expat XML Parser {#expatVer}
 VersionInfoVersion={#expatVer}
 OutputBaseFilename=expat-win32bin-{#expatVer}