diff --git a/examples.xsl b/examples.xsl
index e6bfa2a1..4311f51d 100644
--- a/examples.xsl
+++ b/examples.xsl
@@ -2,7 +2,7 @@
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/protopage.xsl b/protopage.xsl
index c53d2c37..f2227499 100644
--- a/protopage.xsl
+++ b/protopage.xsl
@@ -1,6 +1,6 @@
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/ref.xsl b/ref.xsl
index fdb3238c..a63bea71 100644
--- a/ref.xsl
+++ b/ref.xsl
@@ -2,7 +2,7 @@
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/xep-0001.xml b/xep-0001.xml
index 1848257d..d81b27f7 100644
--- a/xep-0001.xml
+++ b/xep-0001.xml
@@ -450,7 +450,7 @@ Experimental ----> Proposed ----> Active
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/xep-0292.xml b/xep-0292.xml
index 92ae1795..36e0b425 100644
--- a/xep-0292.xml
+++ b/xep-0292.xml
@@ -713,7 +713,7 @@ property-key = element key {
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any
 person obtaining a copy of this software and
diff --git a/xep.dtd b/xep.dtd
index b1162dad..926522e8 100644
--- a/xep.dtd
+++ b/xep.dtd
@@ -2,7 +2,7 @@
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/xep.ent b/xep.ent
index 722fd465..21705de5 100644
--- a/xep.ent
+++ b/xep.ent
@@ -17,7 +17,7 @@
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/xep.xsd b/xep.xsd
index e12b1eeb..62df2fb0 100644
--- a/xep.xsd
+++ b/xep.xsd
@@ -2,7 +2,7 @@
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/xep.xsl b/xep.xsl
index 9dda9433..05353c0a 100644
--- a/xep.xsl
+++ b/xep.xsl
@@ -2,7 +2,7 @@
 
 <!--
 
-Copyright (c) 1999 - 2021 XMPP Standards Foundation
+Copyright (c) 1999 - 2023 XMPP Standards Foundation
 
 Permission is hereby granted, free of charge, to any
 person obtaining a copy of this software and
@@ -257,7 +257,7 @@ content: "XEP-<xsl:value-of select='/xep/header/number'/>";
             </ul></dd>
           </xsl:if>
           <dt>Copyright</dt>
-          <dd>&#169; 1999 &#x2013; 2021 XMPP Standards Foundation. <a href='#appendix-legal'>SEE LEGAL NOTICES</a>.</dd>
+          <dd>&#169; 1999 &#x2013; 2023 XMPP Standards Foundation. <a href='#appendix-legal'>SEE LEGAL NOTICES</a>.</dd>
           <dt>Status</dt>
           <dd>
             <p><xsl:choose>