diff --git a/pom.xml b/pom.xml
index bde981e..2891399 100644
--- a/pom.xml
+++ b/pom.xml
@@ -14,12 +14,12 @@
     <dependency>
       <groupId>io.vertx</groupId>
       <artifactId>vertx-core</artifactId>
-      <version>3.9.16</version>
+      <version>4.5.22</version>
     </dependency>
     <dependency>
     <groupId>io.vertx</groupId>
     <artifactId>vertx-web</artifactId>
-    <version>3.9.16</version>
+    <version>4.5.22</version>
    </dependency>
     <dependency>
       <groupId>junit</groupId>
@@ -30,29 +30,29 @@
     <dependency>
       <groupId>io.vertx</groupId>
       <artifactId>vertx-unit</artifactId>
-      <version>3.9.16</version>
+      <version>4.5.22</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>io.vertx</groupId>
       <artifactId>vertx-web-client</artifactId>
-      <version>3.9.16</version>
+      <version>4.5.22</version>
      </dependency>
   </dependencies>
   <build>
     <plugins>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.3</version>
+        <version>3.14.0</version>
         <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
+          <source>21</source>
+          <target>21</target>
         </configuration>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
-        <version>2.3</version>
+        <version>3.3.0</version>
         <executions>
           <execution>
             <phase>package</phase>
diff --git a/src/main/java/com/indexdata/oaipmhviewer/BrowseArchive.java b/src/main/java/com/indexdata/oaipmhviewer/BrowseArchive.java
index cfe0ef4..583048b 100644
--- a/src/main/java/com/indexdata/oaipmhviewer/BrowseArchive.java
+++ b/src/main/java/com/indexdata/oaipmhviewer/BrowseArchive.java
@@ -3,6 +3,7 @@
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.StringWriter;
+import java.net.URI;
 import java.net.URL;
 import java.util.Arrays;
 
@@ -27,7 +28,6 @@
 import org.xml.sax.SAXException;
 
 import io.vertx.core.AbstractVerticle;
-import io.vertx.core.CompositeFuture;
 import io.vertx.core.Future;
 import io.vertx.core.Promise;
 import io.vertx.core.buffer.Buffer;
@@ -59,7 +59,7 @@ public void start(Promise<Void> promise) {
     // Handle POSTed FORM data
     router.route().handler(BodyHandler.create());
 
-    router.route().handler(FaviconHandler.create());
+    router.route().handler(FaviconHandler.create(vertx));
     router.route("/static/*").handler(StaticHandler.create("static"));
 
     router.route().handler(routingContext -> {
@@ -77,7 +77,7 @@ public void start(Promise<Void> promise) {
         try {
           // Allow user to enter URI without protocol, but assume http then.
           pURL = (inputOaiUrl.matches("https?://.*") ?
-                  new URL(inputOaiUrl) : new URL("http://"+inputOaiUrl));
+                  new URI(inputOaiUrl).toURL() : new URI("http://"+inputOaiUrl).toURL());
 
           String query;
           if (Arrays.asList("Identify",
@@ -107,7 +107,7 @@ public void start(Promise<Void> promise) {
                     String displayOaiResponse = prettyPrintOaiResponse(oaiResponse.body().toString());
                     Future<String> promisedSets = listSets(pURL);
                     Future<String> promisedFormats = listMetadataFormats(pURL);
-                    CompositeFuture.all(promisedSets, promisedFormats).onComplete( cfar -> {
+                    Future.all(promisedSets, promisedFormats).onComplete( cfar -> {
                       String listSets = cfar.result().resultAt(0).toString();
                       String listMetadataFormats = cfar.result().resultAt(1).toString();
                       String page = Page.getHtml(inputOaiUrl,