diff --git a/pom.xml b/pom.xml
index a04d154..40411d8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -130,7 +130,7 @@
         <dependency>
             <groupId>io.vertx</groupId>
             <artifactId>vertx-core</artifactId>
-            <version>4.5.11</version>
+            <version>4.5.21</version>
         </dependency>
         <dependency>
             <groupId>io.vertx</groupId>