diff --git a/ProtocDemo/pom.xml b/ProtocDemo/pom.xml
index 3b9033eb..722b944a 100644
--- a/ProtocDemo/pom.xml
+++ b/ProtocDemo/pom.xml
@@ -12,7 +12,7 @@
         <dependency>
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>2.5.0</version>
+            <version>3.16.3</version>
         </dependency>
     </dependencies>