diff --git a/vertxDemo/pom.xml b/vertxDemo/pom.xml
index 0d93b73..66f0314 100644
--- a/vertxDemo/pom.xml
+++ b/vertxDemo/pom.xml
@@ -19,7 +19,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
-        <vertx.version>3.5.1</vertx.version>
+        <vertx.version>3.9.4</vertx.version>
     </properties>
 
     <dependencies>