diff --git a/images/networkmap/pom.xml b/images/networkmap/pom.xml
index 0589706bd..86331b643 100644
--- a/images/networkmap/pom.xml
+++ b/images/networkmap/pom.xml
@@ -17,7 +17,7 @@
     <kotlin.version>1.2.71</kotlin.version>
     <junit.version>4.13.1</junit.version>
     <!-- DO NOT CHANGE the vertx version to > 3.7.1 -->
-    <vertx.version>3.7.1</vertx.version>
+    <vertx.version>3.9.4</vertx.version>
     <corda.version>4.1</corda.version>
     <dockerfile-maven.version>1.4.0</dockerfile-maven.version>
     <kotlin.compiler.jvmTarget>1.8</kotlin.compiler.jvmTarget>