diff --git a/Chapter02/pom.xml b/Chapter02/pom.xml
index 6fddc04..4b24376 100644
--- a/Chapter02/pom.xml
+++ b/Chapter02/pom.xml
@@ -84,7 +84,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>3.2.0</version>
+			<version>3.16.1</version>
 		</dependency>
 <dependency>
     <groupId>ml.dmlc.mxnet</groupId>