diff --git a/ch19-1/pom.xml b/ch19-1/pom.xml
index 06c80a3b..04385baf 100644
--- a/ch19-1/pom.xml
+++ b/ch19-1/pom.xml
@@ -41,7 +41,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>3.5.1</version>
+			<version>3.16.3</version>
 		</dependency>