diff --git a/google/chat/v1/BUILD.bazel b/google/chat/v1/BUILD.bazel
index 461d2c245f3f7..31dd1512d5fbc 100644
--- a/google/chat/v1/BUILD.bazel
+++ b/google/chat/v1/BUILD.bazel
@@ -244,7 +244,7 @@ php_gapic_library(
     name = "chat_php_gapic",
     srcs = [":chat_proto_with_info"],
     grpc_service_config = "chat_grpc_service_config.json",
-    migration_mode = "PRE_MIGRATION_SURFACE_ONLY",
+    migration_mode = "NEW_SURFACE_ONLY",
     rest_numeric_enums = True,
     service_yaml = "chat_v1.yaml",
     transport = "grpc+rest",