diff --git a/contribs/hybridsim/pom.xml b/contribs/hybridsim/pom.xml
index 496f3b1b96a..fa6c86d2f52 100644
--- a/contribs/hybridsim/pom.xml
+++ b/contribs/hybridsim/pom.xml
@@ -10,7 +10,7 @@
   <name>hybridsim</name>
 
   <properties>
-    <protobuf.version>4.26.1</protobuf.version>
+    <protobuf.version>4.27.0</protobuf.version>
     <grpc.version>1.64.0</grpc.version>
   </properties>
 
diff --git a/contribs/protobuf/pom.xml b/contribs/protobuf/pom.xml
index 8b2b9121993..a824085d737 100644
--- a/contribs/protobuf/pom.xml
+++ b/contribs/protobuf/pom.xml
@@ -11,7 +11,7 @@
     <name>protobuf</name>
 
     <properties>
-        <protobuf.version>4.26.1</protobuf.version>
+        <protobuf.version>4.27.0</protobuf.version>
     </properties>
 
     <dependencies>