diff --git a/neko/update/patch.sh b/neko/update/patch.sh
index 218b4817..33b81b98 100755
--- a/neko/update/patch.sh
+++ b/neko/update/patch.sh
@@ -1,7 +1,14 @@
 #!/bin/sh
 set -eu
 
+# prefix message filename with timestamp
 [ ! -f neko/flags/install_pgroonga ]             || mv neko/flags/install_pgroonga             neko/flags/20231128_install_pgroonga
 [ ! -f neko/flags/docker_compose_rename ]        || mv neko/flags/docker_compose_rename        neko/flags/20231129_docker_compose_rename
 [ ! -f neko/flags/temp_upgrade_node_to_v21 ]     || mv neko/flags/temp_upgrade_node_to_v21     neko/flags/20231229_upgrade_node_to_v21
 [ ! -f neko/flags/add_volume_to_docker_compose ] || mv neko/flags/add_volume_to_docker_compose neko/flags/20240102_add_volume_to_docker_compose
+
+# remove native-utils
+rm -rf packages/backend/native-utils/built
+rm -rf packages/backend/native-utils/node_modules
+rm -rf packages/backend/native-utils/target
+rmdir packages/backend/native-utils || :