diff --git a/README.adoc b/README.adoc
index b508d88..f6cfc07 100644
--- a/README.adoc
+++ b/README.adoc
@@ -326,5 +326,5 @@ This document covered:
 
 == See also
 
-- https://www.graphql-java.com/documentation/v12/[The GraphQL-Java documentation]
+- https://www.graphql-java.com/documentation/getting-started[The GraphQL-Java documentation]
 - https://vertx.io/docs/vertx-web-graphql/java/[The Vert.x Web GraphQL Handler documentation]
diff --git a/build.gradle.kts b/build.gradle.kts
index 022e7f0..5604975 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -14,7 +14,7 @@ java {
 }
 
 dependencies {
-  implementation(platform("io.vertx:vertx-stack-depchain:4.4.0"))
+  implementation(platform("io.vertx:vertx-stack-depchain:5.0.0.CR2"))
   implementation("io.vertx:vertx-web-graphql")
 }
 
diff --git a/pom.xml b/pom.xml
index 338d025..28cbda8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
   <version>1.0-SNAPSHOT</version>
 
   <properties>
-    <vertx.version>4.4.0</vertx.version>
+    <vertx.version>5.0.0.CR2</vertx.version>
   </properties>
 
   <dependencyManagement>
diff --git a/src/main/java/io/vertx/howtos/graphql/GraphQLVerticle.java b/src/main/java/io/vertx/howtos/graphql/GraphQLVerticle.java
index 5db1357..7aef377 100644
--- a/src/main/java/io/vertx/howtos/graphql/GraphQLVerticle.java
+++ b/src/main/java/io/vertx/howtos/graphql/GraphQLVerticle.java
@@ -4,7 +4,8 @@
 import graphql.schema.DataFetchingEnvironment;
 import graphql.schema.idl.SchemaGenerator;
 import graphql.schema.idl.SchemaParser;
-import io.vertx.core.AbstractVerticle;
+import io.vertx.core.Future;
+import io.vertx.core.VerticleBase;
 import io.vertx.core.Vertx;
 import io.vertx.ext.web.Router;
 import io.vertx.ext.web.handler.BodyHandler;
@@ -19,13 +20,13 @@
 import static java.util.stream.Collectors.toList;
 import static java.util.stream.Collectors.toMap;
 
-public class GraphQLVerticle extends AbstractVerticle {
+public class GraphQLVerticle extends VerticleBase {
 
   // tag::start[]
   private Map<String, Task> tasks;
 
   @Override
-  public void start() {
+  public Future<?> start() {
     tasks = initData();
 
     var graphQL = setupGraphQL();
@@ -35,7 +36,7 @@ public void start() {
     router.route().handler(BodyHandler.create()); // <2>
     router.route("/graphql").handler(graphQLHandler); // <3>
 
-    vertx.createHttpServer()
+    return vertx.createHttpServer()
       .requestHandler(router)
       .listen(8080);
   }
@@ -94,13 +95,8 @@ private boolean complete(DataFetchingEnvironment env) {
   // tag::main[]
   public static void main(String[] args) {
     var vertx = Vertx.vertx(); // <1>
-    vertx.deployVerticle(new GraphQLVerticle()).onComplete(ar -> { // <2>
-      if (ar.succeeded()) {
-        System.out.println("Verticle deployed");
-      } else {
-        ar.cause().printStackTrace();
-      }
-    });
+    vertx.deployVerticle(new GraphQLVerticle()).await(); // <2>
+    System.out.println("Verticle deployed");
   }
   // end::main[]
 }