diff --git a/src/introduction.md b/src/introduction.md
index a437074..8391fe8 100644
--- a/src/introduction.md
+++ b/src/introduction.md
@@ -42,7 +42,7 @@ details of the funded project.
     style="border-width:0; margin-right:0.33em; float:left;"
     src="https://i.creativecommons.org/l/by/4.0/88x31.png"></a>
 This manual is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by/4.0/).  
-Copyright © 2021–2022 Tony Garnock-Jones <tonyg@leastfixedpoint.com>.
+Copyright © 2021–2023 Tony Garnock-Jones <tonyg@leastfixedpoint.com>.
 
 The Synit programs and source code are separately licensed. Please see the source code for
 details.