diff --git a/Changes b/Changes
index faad100..5ae494f 100755
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.48 2022-12-21
+0.48 2023-01-09
         - Added support for NKJP tagset in annotation
           assistant. (diewald)
         - Remove deprecated 'auth_support' (since 0.31)
@@ -15,6 +15,10 @@
         - Add textSigle as a plugin receivable information. (diewald)
         - Introduce krill-indexer command via plugin. (diewald)
         - Introduce start-with-backend command via plugin. (diewald)
+        - Update Mojolicious for security reasons. (diewald)
+
+        WARNING: Mojolicious 9.31 is a security update -
+          updating is highly recommended.
 
 0.47 2022-11-22
         - Add command to generate super_client_info file. (diewald)
diff --git a/Makefile.PL b/Makefile.PL
index 96283cd..e89c412 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -17,7 +17,7 @@
   },
   LICENSE      => 'freebsd',
   PREREQ_PM => {
-    'Mojolicious' => '9.30',
+    'Mojolicious' => '9.31',
     'Mojolicious::Plugin::TagHelpers::Pagination' => 0.10,
     'Mojolicious::Plugin::TagHelpers::MailToChiffre' => 0.13,
     'Mojolicious::Plugin::ClosedRedirect' => 0.15,
diff --git a/README.md b/README.md
index 20dfc70..01be02c 100644
--- a/README.md
+++ b/README.md
@@ -303,7 +303,7 @@
 
 ### Original Software
 
-Copyright (C) 2015-2022, [IDS Mannheim](https://www.ids-mannheim.de/)<br>
+Copyright (C) 2015-2023, [IDS Mannheim](https://www.ids-mannheim.de/)<br>
 Author: [Nils Diewald](https://www.nils-diewald.de/), Helge Stallkamp<br>
 Contributor: Eliza Margaretha (Documentation), Susanne Feix (Translation),
 Leo Repp
diff --git a/lib/Kalamar.pm b/lib/Kalamar.pm
index 31ac587..5da9493 100644
--- a/lib/Kalamar.pm
+++ b/lib/Kalamar.pm
@@ -403,7 +403,7 @@
 
 =head2 COPYRIGHT AND LICENSE
 
-Copyright (C) 2015-2022, L<IDS Mannheim|https://www.ids-mannheim.de/>
+Copyright (C) 2015-2023, L<IDS Mannheim|https://www.ids-mannheim.de/>
 Author: L<Nils Diewald|https://www.nils-diewald.de/>
 
 Kalamar is developed as part of the L<KorAP|http://korap.ids-mannheim.de/>