diff --git a/boms/cloud-lts-bom/pom.xml b/boms/cloud-lts-bom/pom.xml
index a803970cc..ed9a74348 100644
--- a/boms/cloud-lts-bom/pom.xml
+++ b/boms/cloud-lts-bom/pom.xml
@@ -50,7 +50,7 @@
     <!-- Layer 1: Core -->
     <guava.version>33.4.0-jre</guava.version>
     <autovalue.version>1.11.0</autovalue.version>
-    <protobuf.version>3.25.8</protobuf.version>
+    <protobuf.version>4.33.0</protobuf.version>
     <io.grpc.version>1.71.0</io.grpc.version>
     <google-http-client.version>1.47.0</google-http-client.version>
     <google-oauth-client.version>1.39.0</google-oauth-client.version>