Updated SS3P link

teaching/index.html

@@ -39,7 +39,7 @@ <h4>Teaching</h4>
 Teaching classes in your area of expertise are the best way to pass information to the next generation.
 Our teaching focuses on software security, security, and systems classes.
 
-<b>Software Security</b> is our key area of expertise and favorite subject to teach. To enable students to learn, Mathias created both an <a href="./SS3P">open text book (SS3P)</a> along with class slides that are already used by several universities.
+<b>Software Security</b> is our key area of expertise and favorite subject to teach. To enable students to learn, Mathias created both an <a href="https://nebelwelt.net/SS3P">open text book (SS3P)</a> along with class slides that are already used by several universities.
 
 To teach <b>systems</b> and <b>operating systems</b>, we refer to the excellent OSTEP book and Mathias has created <a href="https://hexhive.epfl.ch/OSTEP-slides">a publicly available slide deck.</a><br/><br/>
 </div>