diff --git a/pom.xml b/pom.xml
index 0191d7cf..95a75f8b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -75,7 +75,7 @@ Less4j is a port. The original compiler was written in JavaScript and is called
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>2.5.0</version>
+			<version>3.16.3</version>
 		</dependency>
 	</dependencies>
 	<build>