diff --git a/rejoiner/pom.xml b/rejoiner/pom.xml
index c102117..c91274a 100644
--- a/rejoiner/pom.xml
+++ b/rejoiner/pom.xml
@@ -44,7 +44,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.16.1</version>
+      <version>3.16.3</version>
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>