diff --git a/docs/1.4/api/authentication/index.html b/docs/1.4/api/authentication/index.html
index ea7c311..24b6448 100644
--- a/docs/1.4/api/authentication/index.html
+++ b/docs/1.4/api/authentication/index.html
@@ -21,19 +21,19 @@
     <title>Authentication API Specification :: Eclipse Hono&trade; Vers.: 1.4</title>
 
     
-    <link href="/hono/docs/css/nucleus.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/fontawesome-all.min.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/hybrid.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/featherlight.min.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/perfect-scrollbar.min.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/auto-complete.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/theme.css?1612145438" rel="stylesheet">
-    <link href="/hono/docs/css/hugo-theme.css?1612145438" rel="stylesheet">
+    <link href="/hono/docs/css/nucleus.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/fontawesome-all.min.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/hybrid.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/featherlight.min.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/perfect-scrollbar.min.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/auto-complete.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/theme.css?1612232243" rel="stylesheet">
+    <link href="/hono/docs/css/hugo-theme.css?1612232243" rel="stylesheet">
     
-      <link href="/hono/docs/css/theme-hono.css?1612145438" rel="stylesheet">
+      <link href="/hono/docs/css/theme-hono.css?1612232243" rel="stylesheet">
     
 
-    <script src="/hono/docs/js/jquery-2.x.min.js?1612145438"></script>
+    <script src="/hono/docs/js/jquery-2.x.min.js?1612232243"></script>
 
     <style type="text/css">
       :root #header + #content > #left > #rlblock_left{
@@ -83,14 +83,14 @@
     <span data-search-clear=""><i class="fas fa-times"></i></span>
 </div>
 
-<script type="text/javascript" src="/hono/docs/js/lunr.min.js?1612145438"></script>
-<script type="text/javascript" src="/hono/docs/js/auto-complete.js?1612145438"></script>
+<script type="text/javascript" src="/hono/docs/js/lunr.min.js?1612232243"></script>
+<script type="text/javascript" src="/hono/docs/js/auto-complete.js?1612232243"></script>
 <script type="text/javascript">
     
         var baseurl = "https:\/\/www.eclipse.org\/hono\/docs\/\/1.4";
     
 </script>
-<script type="text/javascript" src="/hono/docs/js/search.js?1612145438"></script>
+<script type="text/javascript" src="/hono/docs/js/search.js?1612232243"></script>
 
     
   </div>
@@ -1340,7 +1340,35 @@
                   
                     
                     
-                      <option id="stable" value="/hono/docs/api/authentication/">stable (1.5)</option>
+                      <option id="stable" value="/hono/docs/api/authentication/">stable (1.6)</option>
+                    
+                  
+              
+                  
+              
+                  
+              
+                  
+              
+                  
+              
+                  
+              
+                  
+              
+                  
+              
+                  
+              
+          
+              
+              
+                  
+              
+                  
+                    
+                    
+                      <option id="1.6" value="/hono/docs/1.6/api/authentication/">1.6</option>
                     
                   
               
@@ -1364,6 +1392,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="1.5" value="/hono/docs/1.5/api/authentication/">1.5</option>
@@ -1390,6 +1420,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="1.4" value="/hono/docs/1.4/api/authentication/" selected>1.4</option>
@@ -1416,6 +1448,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="1.3" value="/hono/docs/1.3/api/authentication/">1.3</option>
@@ -1442,6 +1476,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="1.2" value="/hono/docs/1.2/api/authentication/">1.2</option>
@@ -1468,6 +1504,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="1.1" value="/hono/docs/1.1/api/authentication/">1.1</option>
@@ -1494,6 +1532,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="1.0" value="/hono/docs/1.0/api/authentication/">1.0</option>
@@ -1520,6 +1560,8 @@
                   
               
                   
+              
+                  
                     
                     
                       <option id="dev" value="/hono/docs/dev/api/authentication/">dev</option>
@@ -2823,20 +2865,20 @@
     <div style="left: -1000px; overflow: scroll; position: absolute; top: -1000px; border: none; box-sizing: content-box; height: 200px; margin: 0px; padding: 0px; width: 200px;">
       <div style="border: none; box-sizing: content-box; height: 200px; margin: 0px; padding: 0px; width: 200px;"></div>
     </div>
-    <script src="/hono/docs/js/clipboard.min.js?1612145439"></script>
-    <script src="/hono/docs/js/perfect-scrollbar.min.js?1612145439"></script>
-    <script src="/hono/docs/js/perfect-scrollbar.jquery.min.js?1612145439"></script>
-    <script src="/hono/docs/js/jquery.sticky.js?1612145439"></script>
-    <script src="/hono/docs/js/featherlight.min.js?1612145439"></script>
-    <script src="/hono/docs/js/html5shiv-printshiv.min.js?1612145439"></script>
-    <script src="/hono/docs/js/highlight.pack.js?1612145439"></script>
+    <script src="/hono/docs/js/clipboard.min.js?1612232244"></script>
+    <script src="/hono/docs/js/perfect-scrollbar.min.js?1612232244"></script>
+    <script src="/hono/docs/js/perfect-scrollbar.jquery.min.js?1612232244"></script>
+    <script src="/hono/docs/js/jquery.sticky.js?1612232244"></script>
+    <script src="/hono/docs/js/featherlight.min.js?1612232244"></script>
+    <script src="/hono/docs/js/html5shiv-printshiv.min.js?1612232244"></script>
+    <script src="/hono/docs/js/highlight.pack.js?1612232244"></script>
     <script>hljs.initHighlightingOnLoad();</script>
-    <script src="/hono/docs/js/modernizr.custom.71422.js?1612145439"></script>
-    <script src="/hono/docs/js/learn.js?1612145439"></script>
-    <script src="/hono/docs/js/hugo-learn.js?1612145439"></script>
+    <script src="/hono/docs/js/modernizr.custom.71422.js?1612232244"></script>
+    <script src="/hono/docs/js/learn.js?1612232244"></script>
+    <script src="/hono/docs/js/hugo-learn.js?1612232244"></script>
 
-    <link href="/hono/docs/mermaid/mermaid.css?1612145439" type="text/css" rel="stylesheet" />
-    <script src="/hono/docs/mermaid/mermaid.js?1612145439"></script>
+    <link href="/hono/docs/mermaid/mermaid.css?1612232244" type="text/css" rel="stylesheet" />
+    <script src="/hono/docs/mermaid/mermaid.js?1612232244"></script>
     <script>
         mermaid.initialize({ startOnLoad: true });
     </script>