diff --git a/xep.ent b/xep.ent
index 7dad954e..3ed69bee 100644
--- a/xep.ent
+++ b/xep.ent
@@ -279,7 +279,7 @@ THE SOFTWARE.
 <!ENTITY OASIS "<span class='ref'><link url='http://www.oasis-open.org/'>OASIS</link></span> <note>OASIS is a not-for-profit, international consortium that drives the development, convergence and adoption of e-business standards. For further information, see &lt;<link url='http://www.oasis-open.org/'>http://www.oasis-open.org/</link>&gt;.</note>" >
 <!ENTITY OMA "<span class='ref'><link url='http://www.openmobilealliance.org/'>Open Mobile Alliance (OMA)</link></span> <note>The Open Mobile Alliance is the focal point for the development of mobile service enabler specifications, which support the creation of interoperable end-to-end mobile services. For further information, see &lt;<link url='http://www.openmobilealliance.org/'>http://www.openmobilealliance.org/</link>&gt;.</note>" >
 <!ENTITY SFSCA "<span class='ref'><link url='http://cert.startcom.org/'>StartCom Free SSL Certification Authority</link></span> <note> The StartCom Free SSL Certification Authority is a certification authority that offers free or low-cost X.509 certificates to Internet user and server administrators. It is is also the root CA for the XMPP Intermediate Certification Authority run by the XMPP Standards Foundation.  For further information, see &lt;<link url='http://cert.startcom.org/'>http://cert.startcom.org/</link>&gt;.</note>" >
-<!ENTITY XMPPWG "<span class='ref'><link url='http://www.ietf.org/html.charters/xmpp-charter.html'>XMPP Working Group</link></span> <note>The XMPP Working Group was created by the Internet Engineering Task Force to define an adaptation of the base Jabber protocols that could be considered an IETF-approved instant messaging and presence technology. For further information, see &lt;<link url='http://www.ietf.org/html.charters/xmpp-charter.html'>http://www.ietf.org/html.charters/xmpp-charter.html</link>&gt;.</note>" >
+<!ENTITY XMPPWG "<span class='ref'><link url='https://datatracker.ietf.org/wg/xmpp/charter/'>XMPP Working Group</link></span> <note>The XMPP Working Group was created by the Internet Engineering Task Force to define an adaptation of the base Jabber protocols that could be considered an IETF-approved instant messaging and presence technology. For further information, see &lt;<link url='https://datatracker.ietf.org/wg/xmpp/charter/'>https://datatracker.ietf.org/wg/xmpp/charter/</link>&gt;.</note>" >
 <!ENTITY W3C "<span class='ref'><link url='http://www.w3.org/'>World Wide Web Consortium (W3C)</link></span> <note>The World Wide Web Consortium defines data formats and markup languages (such as HTML and XML) for use over the Internet. For further information, see &lt;<link url='http://www.w3.org/'>http://www.w3.org/</link>&gt;.</note>" >
 
 <!-- W3C specs -->