diff --git a/chapter-5/reactive-programming-examples/pom.xml b/chapter-5/reactive-programming-examples/pom.xml
index 194f75a6..d8f85c69 100644
--- a/chapter-5/reactive-programming-examples/pom.xml
+++ b/chapter-5/reactive-programming-examples/pom.xml
@@ -18,7 +18,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
         <mutiny.version>1.6.0</mutiny.version>
-        <mutiny-vertx.version>2.21.0</mutiny-vertx.version>
+        <mutiny-vertx.version>3.9.0</mutiny-vertx.version>
     </properties>
 
     <dependencies>
diff --git a/chapter-7/mutiny-examples/pom.xml b/chapter-7/mutiny-examples/pom.xml
index 628921bc..72fc4b72 100644
--- a/chapter-7/mutiny-examples/pom.xml
+++ b/chapter-7/mutiny-examples/pom.xml
@@ -18,7 +18,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
         <mutiny.version>1.6.0</mutiny.version>
-        <mutiny-vertx.version>2.21.0</mutiny-vertx.version>
+        <mutiny-vertx.version>3.9.0</mutiny-vertx.version>
     </properties>
 
     <dependencies>