diff --git a/contribs/hybridsim/pom.xml b/contribs/hybridsim/pom.xml
index 57b42a70d8a..b276eda7285 100644
--- a/contribs/hybridsim/pom.xml
+++ b/contribs/hybridsim/pom.xml
@@ -10,7 +10,7 @@
   <name>hybridsim</name>
 
   <properties>
-    <protobuf.version>3.25.3</protobuf.version>
+    <protobuf.version>4.26.0</protobuf.version>
     <grpc.version>1.62.2</grpc.version>
   </properties>
 
diff --git a/contribs/protobuf/pom.xml b/contribs/protobuf/pom.xml
index 9e13515761a..202864deec5 100644
--- a/contribs/protobuf/pom.xml
+++ b/contribs/protobuf/pom.xml
@@ -11,7 +11,7 @@
     <name>protobuf</name>
 
     <properties>
-        <protobuf.version>3.25.3</protobuf.version>
+        <protobuf.version>4.26.0</protobuf.version>
     </properties>
 
     <dependencies>