diff --git a/src/site/xdoc/matrix.xml b/src/site/xdoc/matrix.xml
index 355988c..b9e35d2 100644
--- a/src/site/xdoc/matrix.xml
+++ b/src/site/xdoc/matrix.xml
@@ -1073,9 +1073,8 @@
     <section name="Related Links">
       <ul>
         <li><a href="https://cwiki.apache.org/confluence/display/MAVENSCM/SCM+Matrix">Wiki of Maven SCM Matrix</a></li>
-        <li><a href="http://en.wikipedia.org/wiki/Comparison_of_revision_control_software">Comparison of revision control software</a></li>
-        <li><a href="http://en.wikipedia.org/wiki/Source_Code_Management#Common_vocabulary">SCM Common vocabulary</a></li>
-        <li><a href="http://www.cmcrossroads.com/cgi-bin/cmwiki/view/CM/">CM Wiki</a></li>
+        <li><a href="https://en.wikipedia.org/wiki/Comparison_of_revision_control_software">Comparison of revision control software</a></li>
+        <li><a href="https://en.wikipedia.org/wiki/Source_Code_Management#Common_vocabulary">SCM Common vocabulary</a></li>
       </ul>
     </section>
   </body>