diff --git a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/documentation/introduction.html b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/documentation/introduction.html
index 81f9a40aa83..8660509a40f 100644
--- a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/documentation/introduction.html
+++ b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/documentation/introduction.html
@@ -16,7 +16,7 @@
 
         <p>
         For more information see the
-        <a href="http://www.cgal.org/Manual/last/doc_html/cgal_manual/Periodic_3_triangulation_3/Chapter_main.html">CGAL Periodic Triangulation
+        <a href="http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Periodic_3_triangulation_3/Chapter_main.html">CGAL Periodic Triangulation
         package manual</a>.
         </p>
 
diff --git a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about.html b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about.html
index 295127f4c6b..d3104976dff 100644
--- a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about.html
+++ b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about.html
@@ -6,7 +6,7 @@
     <p>This application illustrates the 3D Periodic Delaunay Triangulation 
       of <a href="http://www.cgal.org/">CGAL</a>.</p>
     <p>See also the package manual:<br>
-      <a href="http://www.cgal.org/Manual/last/doc_html/cgal_manual/Periodic_3_triangulation_3/Chapter_main.html">
+      <a href="http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Periodic_3_triangulation_3/Chapter_main.html">
             3D Periodic Triangulations</a>
     </p>
   </body>
diff --git a/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/documentation/introduction.html b/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/documentation/introduction.html
index a6a16e85c03..6a3cf0da13e 100644
--- a/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/documentation/introduction.html
+++ b/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/documentation/introduction.html
@@ -21,7 +21,7 @@
 
         <p>
         For more information on 3D periodic triangulations see the
-        <a href="http://www.cgal.org/Manual/3.6/doc_html/cgal_manual/Periodic_3_triangulation_3/Chapter_main.html">CGAL Periodic Triangulation
+        <a href="http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Periodic_3_triangulation_3/Chapter_main.html">CGAL Periodic Triangulation
         package manual</a>.
         </p>