diff --git a/samples/server/petstore/kotlin-vertx-modelMutable/pom.xml b/samples/server/petstore/kotlin-vertx-modelMutable/pom.xml
index 5b055dc12deb..15504e03a708 100644
--- a/samples/server/petstore/kotlin-vertx-modelMutable/pom.xml
+++ b/samples/server/petstore/kotlin-vertx-modelMutable/pom.xml
@@ -16,7 +16,7 @@
         <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
         <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
         <junit.version>4.13.2</junit.version>
-        <vertx.version>3.9.12</vertx.version>
+        <vertx.version>4.4.0</vertx.version>
         <maven-compiler-plugin.version>3.10.0</maven-compiler-plugin.version>
         <vertx-openapi-router.version>1.0.2</vertx-openapi-router.version>
         <maven-shade-plugin.version>3.2.4</maven-shade-plugin.version>
@@ -172,14 +172,13 @@
                         </goals>
                         <configuration>
                             <transformers>
-                                <transformer
-                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <manifestEntries>
                                         <Main-Class>org.openapitools.server.api.verticle.DefaultApiVerticleKt</Main-Class>
                                     </manifestEntries>
                                 </transformer>
                             </transformers>
-                            <artifactSet />
+                            <artifactSet/>
                             <outputFile>${project.build.directory}/${project.artifactId}-${project.version}-fat.jar</outputFile>
                         </configuration>
                     </execution>