diff --git a/vertx-grpc/pom.xml b/vertx-grpc/pom.xml
index 24aba7c..afd209b 100644
--- a/vertx-grpc/pom.xml
+++ b/vertx-grpc/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>3.6.2</vertx.version>
+    <vertx.version>3.9.4</vertx.version>
     <netty.version>2.0.20.Final</netty.version>
     <proc.gen.version>1.16.1</proc.gen.version>
     <google.proto.version>3.3.0</google.proto.version>