diff --git a/csc/2016/esun/pom.xml b/csc/2016/esun/pom.xml
index 00ab65a9e..e1aa81462 100644
--- a/csc/2016/esun/pom.xml
+++ b/csc/2016/esun/pom.xml
@@ -25,7 +25,7 @@
         <dependency>
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>2.6.0</version>
+            <version>3.16.3</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>