diff --git a/demo/demo-etcd/consumer/pom.xml b/demo/demo-etcd/consumer/pom.xml
index 5f79529d65..220b8f7939 100644
--- a/demo/demo-etcd/consumer/pom.xml
+++ b/demo/demo-etcd/consumer/pom.xml
@@ -37,7 +37,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.25.5</version>
+      <version>4.28.3</version>
       <scope>runtime</scope>
     </dependency>
     <dependency>
diff --git a/demo/demo-etcd/gateway/pom.xml b/demo/demo-etcd/gateway/pom.xml
index 9bed75de85..da2ae50baf 100644
--- a/demo/demo-etcd/gateway/pom.xml
+++ b/demo/demo-etcd/gateway/pom.xml
@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.25.5</version>
+      <version>4.28.3</version>
       <scope>runtime</scope>
     </dependency>
     <dependency>
diff --git a/demo/demo-etcd/provider/pom.xml b/demo/demo-etcd/provider/pom.xml
index cc926bda1c..a3fdd1216f 100644
--- a/demo/demo-etcd/provider/pom.xml
+++ b/demo/demo-etcd/provider/pom.xml
@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.25.5</version>
+      <version>4.28.3</version>
       <scope>runtime</scope>
     </dependency>
     <dependency>
diff --git a/demo/demo-etcd/test-client/pom.xml b/demo/demo-etcd/test-client/pom.xml
index d14d1b1c45..0d82cc7a37 100644
--- a/demo/demo-etcd/test-client/pom.xml
+++ b/demo/demo-etcd/test-client/pom.xml
@@ -53,7 +53,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.25.5</version>
+      <version>4.28.3</version>
       <scope>runtime</scope>
     </dependency>
   </dependencies>
diff --git a/dependencies/default/pom.xml b/dependencies/default/pom.xml
index e45e92a226..4f44ad804c 100644
--- a/dependencies/default/pom.xml
+++ b/dependencies/default/pom.xml
@@ -74,7 +74,7 @@
     <netty.version>4.1.113.Final</netty.version>
     <okhttp3.version>4.12.0</okhttp3.version>
     <prometheus.version>0.16.0</prometheus.version>
-    <protobuf.version>3.23.4</protobuf.version>
+    <protobuf.version>4.28.3</protobuf.version>
     <protostuff.version>1.8.0</protostuff.version>
     <protostuff-parser.version>2.2.27</protostuff-parser.version>
     <reactive-streams.version>1.0.4</reactive-streams.version>