diff --git a/xep.xsl b/xep.xsl
index 25c5d1db..46b86f02 100644
--- a/xep.xsl
+++ b/xep.xsl
@@ -344,7 +344,7 @@ OR OTHER DEALINGS IN THE SOFTWARE.
         <!-- XMPP NOTICE -->
         <a name='appendix-xmpp'></a>
         <h3>Appendix D: Relation to XMPP</h3>
-        <p class='indent'>The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 3920) and XMPP IM (RFC 3921) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.</p>
+        <p class='indent'>The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 6120) and XMPP IM (RFC 6121) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.</p>
         <hr />
         <!-- DISCUSSION VENUE -->
         <a name='appendix-discuss'></a>