diff --git a/tcp/pom.xml b/tcp/pom.xml
index acebff6..5602c6f 100644
--- a/tcp/pom.xml
+++ b/tcp/pom.xml
@@ -23,7 +23,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>3.1.0</version>
+			<version>3.16.1</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.mina</groupId>