diff --git a/CONTRIBUTORS b/CONTRIBUTORS
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -1,8 +1,9 @@
 List of contributors to Kallithea project:
 
-    Mads Kiilerich <mads@kiilerich.com> 2016-2022
+    Mads Kiilerich <mads@kiilerich.com> 2016-2023
+    Manuel Jacob <me@manueljacob.de> 2019-2020 2022-2023
+    Mathias De Mare <mathias.de_mare@nokia.com> 2023
     Asterios Dimitriou <steve@pci.gr> 2016-2017 2020 2022
-    Manuel Jacob <me@manueljacob.de> 2019-2020 2022
     Jaime Marquínez Ferrándiz <weblate@jregistros.fastmail.net> 2022
     Louis Bertrand <louis.bertrand@durhamcollege.ca> 2022
     toras9000 <toras9000@gmail.com> 2022
diff --git a/docs/conf.py b/docs/conf.py
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -47,7 +47,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = 'Kallithea'
-copyright = '2010-2022 by various authors, licensed as GPLv3.'
+copyright = '2010-2023 by various authors, licensed as GPLv3.'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
diff --git a/kallithea/templates/about.html b/kallithea/templates/about.html
--- a/kallithea/templates/about.html
+++ b/kallithea/templates/about.html
@@ -24,9 +24,10 @@
   necessarily limited to the following:</p>
   <ul>
 
-  <li>Copyright &copy; 2012&ndash;2022, Mads Kiilerich</li>
+  <li>Copyright &copy; 2012&ndash;2023, Mads Kiilerich</li>
+  <li>Copyright &copy; 2019&ndash;2020, 2022&ndash;2023, Manuel Jacob</li>
+  <li>Copyright &copy; 2023, Mathias De Mare</li>
   <li>Copyright &copy; 2016&ndash;2017, 2020, 2022, Asterios Dimitriou</li>
-  <li>Copyright &copy; 2019&ndash;2020, 2022, Manuel Jacob</li>
   <li>Copyright &copy; 2022, Jaime Marquínez Ferrándiz</li>
   <li>Copyright &copy; 2022, Louis Bertrand</li>
   <li>Copyright &copy; 2022, toras9000</li>
diff --git a/kallithea/templates/base/base.html b/kallithea/templates/base/base.html
--- a/kallithea/templates/base/base.html
+++ b/kallithea/templates/base/base.html
@@ -23,7 +23,7 @@
             <a class="navbar-link" href="${h.url('kallithea_project_url')}" target="_blank">Kallithea</a>,
         %endif
         which is
-        <a class="navbar-link" href="${h.canonical_url('about')}#copyright">&copy; 2010&ndash;2022 by various authors &amp; licensed under GPLv3</a>.
+        <a class="navbar-link" href="${h.canonical_url('about')}#copyright">&copy; 2010&ndash;2023 by various authors &amp; licensed under GPLv3</a>.
         %if c.issues_url:
             &ndash; <a class="navbar-link" href="${c.issues_url}" target="_blank">${_('Support')}</a>
         %endif