diff --git a/netty-websocket-example/pom.xml b/netty-websocket-example/pom.xml
index 1d1be7f..d56394c 100644
--- a/netty-websocket-example/pom.xml
+++ b/netty-websocket-example/pom.xml
@@ -44,7 +44,7 @@
         <dependency>
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>2.6.1</version>
+            <version>3.16.3</version>
         </dependency>
         <dependency>
             <groupId>org.jboss.marshalling</groupId>