diff --git a/odpf/optimus/runtime_service.proto b/odpf/optimus/runtime_service.proto
index f2a6b668..eddf8fe7 100644
--- a/odpf/optimus/runtime_service.proto
+++ b/odpf/optimus/runtime_service.proto
@@ -466,7 +466,7 @@ message CheckJobSpecificationsResponse {
 
 message RegisterProjectRequest {
     ProjectSpecification project = 1;
-    NamespaceSpecification namespace = 2;
+    NamespaceSpecification namespace = 2 [deprecated=true];
 }
 
 message RegisterProjectResponse {