diff --git a/xep-0406.xml b/xep-0406.xml
index 3fea382c..fb841bb1 100644
--- a/xep-0406.xml
+++ b/xep-0406.xml
@@ -38,6 +38,12 @@
   <shortname>MIX-ADMIN</shortname>
   &ksmithisode;
   &skille;
+  <revision>
+    <version>0.3.0</version>
+    <date>2021-03-09</date>
+    <initials>@mathieui</initials>
+    <remark><p>Fix reference to MIX-CORE namespaces</p></remark>
+  </revision>
   <revision>
     <version>0.2.0</version>
     <date>2018-06-06</date>
@@ -222,7 +228,7 @@
        <item>
          <x xmlns='jabber:x:data' type='form'>
            <field var='FORM_TYPE' type='hidden'>
-             <value>urn:xmpp:mix:core:0</value>
+             <value>urn:xmpp:mix:core:1</value>
            </field>
            <title>Information Node Modification</title>
            <field type='text-multi'
@@ -254,7 +260,7 @@
           <item>
             <x xmlns='jabber:x:data' type='submit'>
               <field var='FORM_TYPE' type='hidden'>
-                <value>urn:xmpp:mix:core:0</value>
+                <value>urn:xmpp:mix:core:1</value>
               </field>
               <field var='Name'>
                  <value>Witches Coven</value>
@@ -280,7 +286,7 @@
     <pubsub xmlns='http://jabber.org/protocol/pubsub'>
       <publish node='urn:xmpp:mix:nodes:info'>
         <items>
-           <item id='2016-05-30T09:00:00' xmlns='urn:xmpp:mix:core:0'/>
+           <item id='2016-05-30T09:00:00' xmlns='urn:xmpp:mix:core:1'/>
          </items>
        </publish>
    </pubsub>
diff --git a/xep-0408.xml b/xep-0408.xml
index 83b8ee58..fd345bad 100644
--- a/xep-0408.xml
+++ b/xep-0408.xml
@@ -35,6 +35,12 @@
   <shortname>MIX-MUC</shortname>
   &ksmithisode;
   &skille;
+  <revision>
+    <version>0.2.0</version>
+    <date>2021-03-09</date>
+    <initials>@mathieui</initials>
+    <remark><p>Fix reference to MIX-CORE namespaces</p></remark>
+  </revision>
   <revision>
     <version>0.1.1</version>
     <date>2020-12-01</date>
@@ -91,9 +97,9 @@
         category='conference'
         name='Shakespearean Chat Service'
         type='text'/>
-    <feature var='urn:xmpp:mix:core:0'/>
+    <feature var='urn:xmpp:mix:core:1'/>
     <feature var='http://jabber.org/protocol/muc'/>
-    <feature var='urn:xmpp:mix:core:0#searchable'/>
+    <feature var='urn:xmpp:mix:core:1#searchable'/>
   </query>
 </iq>
 ]]></example>
@@ -121,7 +127,7 @@
         category='conference'
         name='Shakespearean Chat Service'
         type='text'/>
-    <feature var='urn:xmpp:mix:core:0'/>
+    <feature var='urn:xmpp:mix:core:1'/>
     <x xmlns='jabber:x:data' type='result'>
       <field var='FORM_TYPE' type='hidden'>
         <value>urn:xmpp:mix:muc:0#muc-mirror</value>