diff --git a/blockchain-ducatus/pom.xml b/blockchain-ducatus/pom.xml
index 396c38e..3d9ab1a 100644
--- a/blockchain-ducatus/pom.xml
+++ b/blockchain-ducatus/pom.xml
@@ -38,7 +38,7 @@
         <dependency>
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>3.7.1</version>
+            <version>3.16.3</version>
         </dependency>
     </dependencies>