diff --git a/leti/0303/kas/1/AsyncChatClient/pom.xml b/leti/0303/kas/1/AsyncChatClient/pom.xml
index d4374bbc..f9acda13 100644
--- a/leti/0303/kas/1/AsyncChatClient/pom.xml
+++ b/leti/0303/kas/1/AsyncChatClient/pom.xml
@@ -92,7 +92,7 @@
         <dependency>
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>2.6.1</version>
+            <version>3.16.3</version>
         </dependency>
         <dependency>
             <groupId>log4j</groupId>