diff --git a/mqtt-spy-common/pom.xml b/mqtt-spy-common/pom.xml
index 576f94b4..532e523b 100644
--- a/mqtt-spy-common/pom.xml
+++ b/mqtt-spy-common/pom.xml
@@ -67,7 +67,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>2.6.1</version>
+			<version>3.16.3</version>
 		</dependency>
 		
 		<dependency>