diff --git a/docsrc/acknowledgements/acknowledgements.html b/docsrc/acknowledgements/acknowledgements.html
index 8ce2188..dc3cb02 100644
--- a/docsrc/acknowledgements/acknowledgements.html
+++ b/docsrc/acknowledgements/acknowledgements.html
@@ -1,21 +1,21 @@
 <div class="acklogo">
-	<a href="http://camptocamp.com" target="_blank"><img src="../_static/camptocamp.svg" style="max-width: 200px"
+	<a href="https://camptocamp.com" target="_blank"><img src="../_static/camptocamp.svg" style="max-width: 200px"
 		alt="Camptocamp" />
 	</a>
 	<p>
 		<a href="http://camptocamp.com" target="_blank">Camptocamp</a> provides development, support and hosting services for GeoNetwork Opensource solutions.</p>
 </div>
 <div class="acklogo">
-	<a href="http://geocat.net" target="_blank"><img src="../_static/GeoCat.png" alt="GeoCat bv" /></a>	 	
+	<a href="https://geocat.net" target="_blank"><img src="../_static/GeoCat.png" alt="GeoCat bv" /></a>	 	
 	<p><a href="http://geocat.net" target="_blank">GeoCat bv</a> provides professional GeoNetwork development and hosting services.</p>
 </div>
 <div class="acklogo">
-	<a href="http://titellus.net" alt="titellus" target="_blank"><img src="../_static/titellus.png" width="135px" /></a>
+	<a href="https://titellus.net" alt="titellus" target="_blank"><img src="../_static/titellus.png" width="135px" /></a>
 	<p>How to efficiently reference data and applying search technology to better discover and use information is the core of <a href="http://titellus.net" target="_blank">titellus</a> expertise.
 	</p>
 </div>
 <div class="acklogo">
-	<a href="http://www.yourkit.com" target="_blank"><img src="../_static/YourKit-logo.png" alt="YourKit" /></a>            
+	<a href="https://www.yourkit.com" target="_blank"><img src="../_static/YourKit-logo.png" alt="YourKit" /></a>            
 	<p>
 		YourKit is kindly supporting open source projects with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications.
 		<br/>