diff --git a/htroot/Crawler_p.html b/htroot/Crawler_p.html
index a2c9fd24a..4e0b868aa 100644
--- a/htroot/Crawler_p.html
+++ b/htroot/Crawler_p.html
@@ -290,7 +290,7 @@ window.setInterval("setTableSize()", 1000);
 <td>
   <form style="float:right;" action="Crawler_p.html"><input type="submit" name="hidewebstructuregraph" class="btn btn-default btn-xs" value="hide graphic"/><form>
 </td></tr></table>
-<script src="js/d3.v3.min.js"></script>
+<script src="js/d3.v5.min.js"></script>
 <script src="js/hypertree.js"></script>
 <div id="linkstructure"></div>
 <script>$(document).ready(linkstructure("#[hosts]#", "#linkstructure", 1280, 720, 3000, 700));</script>::
diff --git a/htroot/HostBrowser.html b/htroot/HostBrowser.html
index 7deb397e2..dd540b19c 100644
--- a/htroot/HostBrowser.html
+++ b/htroot/HostBrowser.html
@@ -232,7 +232,7 @@ var solr= $.getJSON("solr/collection1/select?q=*:*&defType=edismax&start=0&rows=
     </fieldset>
     
     #(linkgraph)#<div style="text-align:center"><form><input name="showlinkstructure" onClick="location.href = location.toString() + '&showlinkstructure=';" class="btn btn-default btn-xs" value="show link structure graph"/></form></div>::
-    <script src="js/d3.v3.min.js"></script>
+    <script src="js/d3.v5.min.js"></script>
     <script src="js/hypertree.js"></script>
     <div id="linkstructure"></div>
     <script>$(document).ready(linkstructure("#[host]#", "#linkstructure", 1280, 720, 3000, 700));</script>
diff --git a/htroot/js/d3.v3.min.js b/htroot/js/d3.v3.min.js
deleted file mode 100644
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e,i,o,a,u=w(this,arguments),f=t.event.changedTouches,c=f.length;for(fb(),i=0;i<c;++i)a=[a=It(this,f,(o=f[i]).identifier),this.__zoom.invert(a),o.identifier],u.touch0?u.touch1||(u.touch1=a):(u.touch0=a,e=!0);if(n&&(n=clearTimeout(n),!u.touch1))return u.end(),void((a=Dt(this).on("dblclick.zoom"))&&a.apply(this,arguments));e&&(n=setTimeout(function(){n=null},p),Nr(this),u.start())}}function E(){var e,r,i,a,u=w(this,arguments),f=t.event.changedTouches,s=f.length;for(cb(),n&&(n=clearTimeout(n)),e=0;e<s;++e)i=It(this,f,(r=f[e]).identifier),u.touch0&&u.touch0[2]===r.identifier?u.touch0[0]=i:u.touch1&&u.touch1[2]===r.identifier&&(u.touch1[0]=i);if(r=u.that.__zoom,u.touch1){var l=u.touch0[0],h=u.touch0[1],d=u.touch1[0],p=u.touch1[1],v=(v=d[0]-l[0])*v+(v=d[1]-l[1])*v,g=(g=p[0]-h[0])*g+(g=p[1]-h[1])*g;r=_(r,Math.sqrt(v/g)),i=[(l[0]+d[0])/2,(l[1]+d[1])/2],a=[(h[0]+p[0])/2,(h[1]+p[1])/2]}else{if(!u.touch0)return;i=u.touch0[0],a=u.touch0[1]}u.zoom("touch",o(b(r,i,a),u.extent,c))}function k(){var n,r,i=w(this,arguments),o=t.event.changedTouches,a=o.length;for(fb(),e&&clearTimeout(e),e=setTimeout(function(){e=null},p),n=0;n<a;++n)r=o[n],i.touch0&&i.touch0[2]===r.identifier?delete i.touch0:i.touch1&&i.touch1[2]===r.identifier&&delete i.touch1;i.touch1&&!i.touch0&&(i.touch0=i.touch1,delete i.touch1),i.touch0?i.touch0[1]=this.__zoom.invert(i.touch0[0]):i.end()}return y.transform=function(t,n){var e=t.selection?t.selection():t;e.property("__zoom",hb),t!==e?x(t,n):e.interrupt().each(function(){w(this,arguments).start().zoom(null,"function"==typeof n?n.apply(this,arguments):n).end()})},y.scaleBy=function(t,n){y.scaleTo(t,function(){return this.__zoom.k*("function"==typeof n?n.apply(this,arguments):n)})},y.scaleTo=function(t,n){y.transform(t,function(){var t=i.apply(this,arguments),e=this.__zoom,r=m(t),a=e.invert(r),u="function"==typeof n?n.apply(this,arguments):n;return o(b(_(e,u),r,a),t,c)})},y.translateBy=function(t,n,e){y.transform(t,function(){return o(this.__zoom.translate("function"==typeof n?n.apply(this,arguments):n,"function"==typeof e?e.apply(this,arguments):e),i.apply(this,arguments),c)})},y.translateTo=function(t,n,e){y.transform(t,function(){var t=i.apply(this,arguments),r=this.__zoom,a=m(t);return o(ab.translate(a[0],a[1]).scale(r.k).translate("function"==typeof n?-n.apply(this,arguments):-n,"function"==typeof e?-e.apply(this,arguments):-e),t,c)})},M.prototype={start:function(){return 1==++this.active&&(this.index=h.push(this)-1,this.emit("start")),this},zoom:function(t,n){return this.mouse&&"mouse"!==t&&(this.mouse[1]=n.invert(this.mouse[0])),this.touch0&&"touch"!==t&&(this.touch0[1]=n.invert(this.touch0[0])),this.touch1&&"touch"!==t&&(this.touch1[1]=n.invert(this.touch1[0])),this.that.__zoom=n,this.emit("zoom"),this},end:function(){return 0==--this.active&&(h.splice(this.index,1),this.index=-1,this.emit("end")),this},emit:function(t){Ct(new ib(y,t,this.that.__zoom),d.apply,d,[t,this.that,this.args])}},y.wheelDelta=function(t){return arguments.length?(a="function"==typeof t?t:rb(+t),y):a},y.filter=function(t){return arguments.length?(r="function"==typeof t?t:rb(!!t),y):r},y.touchable=function(t){return arguments.length?(u="function"==typeof t?t:rb(!!t),y):u},y.extent=function(t){return arguments.length?(i="function"==typeof t?t:rb([[+t[0][0],+t[0][1]],[+t[1][0],+t[1][1]]]),y):i},y.scaleExtent=function(t){return arguments.length?(f[0]=+t[0],f[1]=+t[1],y):[f[0],f[1]]},y.translateExtent=function(t){return arguments.length?(c[0][0]=+t[0][0],c[1][0]=+t[1][0],c[0][1]=+t[0][1],c[1][1]=+t[1][1],y):[[c[0][0],c[0][1]],[c[1][0],c[1][1]]]},y.constrain=function(t){return arguments.length?(o=t,y):o},y.duration=function(t){return arguments.length?(s=+t,y):s},y.interpolate=function(t){return arguments.length?(l=t,y):l},y.on=function(){var t=d.on.apply(d,arguments);return t===d?y:t},y.clickDistance=function(t){return arguments.length?(g=(t=+t)*t,y):Math.sqrt(g)},y},t.zoomTransform=ub,t.zoomIdentity=ab,Object.defineProperty(t,"__esModule",{value:!0})});
diff --git a/htroot/js/hypertree.js b/htroot/js/hypertree.js
index 4c69ec753..d823c4276 100644
--- a/htroot/js/hypertree.js
+++ b/htroot/js/hypertree.js
@@ -20,15 +20,26 @@
 function linkstructure(hostname, element, width, height, maxtime, maxnodes) {
 	var nodes = {};
 	var links = [];
-	var linkstructure = {};
 	$.getJSON("api/linkstructure.json?about=" + hostname + "&maxtime=" + maxtime + "&maxnodes=" + maxnodes, function(linkstructure) {
 		links = linkstructure.graph;
 		links.forEach(function(link) {
 			  link.source = nodes[link.source] || (nodes[link.source] = {name: link.source, type:"Inbound"});
 			  link.target = nodes[link.target] || (nodes[link.target] = {name: link.target, type:link.type});
 		});
-		var force = d3.layout.force().nodes(d3.values(nodes)).links(links).size([width, height]).linkDistance(60).charge(-800).on("tick", tick).start();
-		force.gravity(0.7);
+		
+		/* attract nodes to the center - was set with force.gravity(0.7) in d3v3 */
+		var forceX = d3.forceX(width / 2).strength(0.7);
+		var forceY = d3.forceY(height / 2).strength(0.7);
+		
+		var link = d3.forceLink(links).distance(60).strength(1);
+		var simulation = d3.forceSimulation()
+			.nodes(d3.values(nodes))
+			.force('link', link)
+			.force("center", d3.forceCenter(width / 2, height / 2)) // center elements - was set with size([width, height]) in d3v3
+			.force('charge', d3.forceManyBody().strength(-800))
+			.force('x', forceX)
+			.force('y',  forceY)
+			.on("tick", ticked);
 		var svg = d3.select(element).append("svg").attr("id", "hypertree").attr("width", width).attr("height", height);
 		svg.append("defs").selectAll("marker")
 		    .data(["Dead", "Outbound", "Inbound"])
@@ -49,15 +60,15 @@ function linkstructure(hostname, element, width, height, maxtime, maxnodes) {
 		svg.append("text").attr("x", 10).attr("y", height - 10).text("blue: links to other domains").attr("style", "font-size:9px").attr("fill", "lightblue");
 		svg.append("text").attr("x", 10).attr("y", height).text("red: dead links").attr("style", "font-size:9px").attr("fill", "red");
 		var path = svg.append("g")
-			.selectAll("path").data(force.links()).enter().append("path")
+			.selectAll("path").data(link.links()).enter().append("path")
 			.attr("class",function(d) {return "hypertree-link " + d.type; })
 			.attr("marker-end", function(d) { return "url(#" + d.type + ")";});
-		var circle = svg.append("g").selectAll("circle").data(force.nodes()).enter().append("circle").attr("r", 4).call(force.drag);
+		var circle = svg.append("g").selectAll("circle").data(simulation.nodes()).enter().append("circle").attr("r", 4).call(d3.drag());
 		var text = svg.append("g")
-			.selectAll("text").data(force.nodes()).enter().append("text").attr("x", 8).attr("y", ".31em")
+			.selectAll("text").data(simulation.nodes()).enter().append("text").attr("x", 8).attr("y", ".31em")
 			.attr("style", function(d) {return d.type == "Outbound" ? "fill:#888888;" : "fill:#000000;";})
 			.text(function(d) {return d.name;});
-		function tick() {
+		function ticked() {
 		  path.attr("d", linkArc);
 		  circle.attr("transform", transform);
 		  text.attr("transform", transform);
diff --git a/htroot/jslicense.html b/htroot/jslicense.html
index 29c2379b4..b863e6d0e 100755
--- a/htroot/jslicense.html
+++ b/htroot/jslicense.html
@@ -99,9 +99,9 @@
 			<td><a href="env/bootstrap/js/typeahead.jquery.js">typeahead.jquery.js</a> (0.10.5)</td>
 		</tr>
 		<tr>
-			<td><a href="js/d3.v3.min.js">d3.v3.min.js</a></td>
+			<td><a href="js/d3.v5.min.js">d3.v5.min.js</a></td>
 			<td><a href="http://opensource.org/licenses/BSD-3-Clause">Modified-BSD</a></td>
-			<td><a href="https://raw.githubusercontent.com/d3/d3.github.com/b3382f60bf721923c7c649709adcfb4c8b66d994/d3.v3.js">d3.v3.js</a>  (3.4.4)</td>
+			<td><a href="https://unpkg.com/d3@5.7.0/dist/d3.js">d3.js</a>  (5.7.0)</td>
 		</tr>
 		<tr>
 			<td><a href="js/highslide/highslide.js">highslide.js</a></td>