diff --git a/app/Http/Controllers/RegularContractCreateController.php b/app/Http/Controllers/RegularContractCreateController.php
index c269d6a..abf44ad 100644
--- a/app/Http/Controllers/RegularContractCreateController.php
+++ b/app/Http/Controllers/RegularContractCreateController.php
@@ -94,7 +94,7 @@ class RegularContractCreateController extends Controller
         $parks_table = $query->get();
 
         if ($sort === 'park_ruby' || $sort === 'station_name_ruby') {
-            $collator = new \Collator('ja_JP');
+            $collator = new \Collator('ja');
             $parks_table = $parks_table->sort(function ($a, $b) use ($order, $sort, $collator) {
                 $a_val = $a->$sort ?? '';
                 $b_val = $b->$sort ?? '';