diff --git a/Documentation/doc/biblio/cgal_manual.bib b/Documentation/doc/biblio/cgal_manual.bib
index 38b745f6780..371192f9423 100644
--- a/Documentation/doc/biblio/cgal_manual.bib
+++ b/Documentation/doc/biblio/cgal_manual.bib
@@ -338,7 +338,7 @@ Boissonnat}
   ,title        = "{PLY} - Polygon File Format"
   ,howpublished = {Paul Bourke}
   ,year         = 2011
-  ,url          = "http://paulbourke.net/dataformats/ply/"
+  ,url          = "https://paulbourke.net/dataformats/ply/"
 }
 
 
diff --git a/Stream_support/doc/Stream_support/File_formats/Supported_file_formats.txt b/Stream_support/doc/Stream_support/File_formats/Supported_file_formats.txt
index 1808e82a1b5..192e66ddf64 100644
--- a/Stream_support/doc/Stream_support/File_formats/Supported_file_formats.txt
+++ b/Stream_support/doc/Stream_support/File_formats/Supported_file_formats.txt
@@ -192,7 +192,7 @@ The `PLY` file format, using the file extension `.ply`, is an \ascii or binary f
 conceived to store the data obtained during 3D scans. Objects are stored
 as a simple list of polygons and external properties can be stored.
 
-A precise specification of those formats is available <a href="http://paulbourke.net/dataformats/ply/">here</a>.
+A precise specification of those formats is available <a href="https://paulbourke.net/dataformats/ply/">here</a>.
 
 <table class="iotable">
   <tr>
@@ -327,7 +327,7 @@ of its coordinates and other properties. Only coordinates and normals are curren
 The `GOCAD` format, using the file extension `.ts`, is an \ascii file format
 that enables a range of primitive types to be imported into the GOCAD package.
 
-A precise specification of the format is available <a href="http://paulbourke.net/dataformats/gocad/gocad.pdf"> here</a>.
+A precise specification of the format is available <a href="https://paulbourke.net/dataformats/gocad/gocad.pdf"> here</a>.
 
 <table class="iotable">
   <tr>