diff --git a/google/cloud/discoveryengine/v1beta/BUILD.bazel b/google/cloud/discoveryengine/v1beta/BUILD.bazel
index d231932f26..6bff29368b 100644
--- a/google/cloud/discoveryengine/v1beta/BUILD.bazel
+++ b/google/cloud/discoveryengine/v1beta/BUILD.bazel
@@ -241,7 +241,6 @@ load(
     "@com_google_googleapis_imports//:imports.bzl",
     "php_gapic_assembly_pkg",
     "php_gapic_library",
-    "php_grpc_library",
     "php_proto_library",
 )
 
@@ -250,12 +249,6 @@ php_proto_library(
     deps = [":discoveryengine_proto"],
 )
 
-php_grpc_library(
-    name = "discoveryengine_php_grpc",
-    srcs = [":discoveryengine_proto"],
-    deps = [":discoveryengine_php_proto"],
-)
-
 php_gapic_library(
     name = "discoveryengine_php_gapic",
     srcs = [":discoveryengine_proto_with_info"],
@@ -263,8 +256,8 @@ php_gapic_library(
     rest_numeric_enums = True,
     service_yaml = "discoveryengine_v1beta.yaml",
     transport = "grpc+rest",
+    migration_mode = "NEW_SURFACE_ONLY",
     deps = [
-        ":discoveryengine_php_grpc",
         ":discoveryengine_php_proto",
     ],
 )
@@ -274,7 +267,6 @@ php_gapic_assembly_pkg(
     name = "google-cloud-discoveryengine-v1beta-php",
     deps = [
         ":discoveryengine_php_gapic",
-        ":discoveryengine_php_grpc",
         ":discoveryengine_php_proto",
     ],
 )