diff --git a/io-hotmoka-node-tendermint/pom.xml b/io-hotmoka-node-tendermint/pom.xml
index af18951a7..d5a573604 100644
--- a/io-hotmoka-node-tendermint/pom.xml
+++ b/io-hotmoka-node-tendermint/pom.xml
@@ -63,7 +63,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.21.7</version>
+      <version>3.25.5</version>
 	</dependency>
 	<dependency>
       <groupId>com.google.code.gson</groupId>