diff --git a/csc/2016/grk/grk_1_java/pom.xml b/csc/2016/grk/grk_1_java/pom.xml
index f84c133c0..dc90765fe 100644
--- a/csc/2016/grk/grk_1_java/pom.xml
+++ b/csc/2016/grk/grk_1_java/pom.xml
@@ -11,7 +11,7 @@
         <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>