diff --git a/Chapter03/BitcoinModelTraining/pom.xml b/Chapter03/BitcoinModelTraining/pom.xml
index a3a1bf1..8d8216b 100644
--- a/Chapter03/BitcoinModelTraining/pom.xml
+++ b/Chapter03/BitcoinModelTraining/pom.xml
@@ -103,7 +103,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>3.2.0</version>
+			<version>3.16.3</version>
 		</dependency>
 <dependency>
     <groupId>ml.dmlc.mxnet</groupId>