diff --git a/src/application/recommendation/pom.xml b/src/application/recommendation/pom.xml
index 7c0c6f0..8bdc4a9 100644
--- a/src/application/recommendation/pom.xml
+++ b/src/application/recommendation/pom.xml
@@ -12,7 +12,7 @@
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
-        <vertx.version>3.5.4</vertx.version>
+        <vertx.version>3.9.4</vertx.version>
         <vertx.maven.plugin.version>1.0.13</vertx.maven.plugin.version>
     </properties>