diff --git a/netty-redis-zk-crazymaker-20200521/NettyDemos/pom.xml b/netty-redis-zk-crazymaker-20200521/NettyDemos/pom.xml
index 99fff29..dfeaa7d 100644
--- a/netty-redis-zk-crazymaker-20200521/NettyDemos/pom.xml
+++ b/netty-redis-zk-crazymaker-20200521/NettyDemos/pom.xml
@@ -17,7 +17,7 @@
         <springboot>2.0.0.RELEASE</springboot>
         <!--<springboot>1.5.9.RELEASE</springboot>-->
         <netty.version>4.0.33.Final</netty.version>
-        <protobuf.version>3.6.1</protobuf.version>
+        <protobuf.version>3.16.3</protobuf.version>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>