diff --git a/ztl/pom.xml b/ztl/pom.xml
index 4ece716..312db5b 100644
--- a/ztl/pom.xml
+++ b/ztl/pom.xml
@@ -26,7 +26,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>2.4.1</version>
+			<version>3.16.1</version>
 		</dependency>
 		<dependency>
 			<groupId>commons-jxpath</groupId>