diff --git a/web/app/controllers/hack_list.php b/web/app/controllers/hack_list.php
index 32d69ff..cd43275 100644
--- a/web/app/controllers/hack_list.php
+++ b/web/app/controllers/hack_list.php
@@ -108,7 +108,13 @@ d-inline-block
 <?php endif ?>
 		">
 			<label for="input-status" class="control-label"><?= UOJLocale::get('problems::result') ?>:</label>
-			<select class="form-control input-sm" id="input-status" name="status">
+			<select class="input-sm
+			<?php if (isset($REQUIRE_LIB['bootstrap5'])): ?>
+				form-select
+			<?php else: ?>
+				form-control
+			<?php endif ?>
+			" id="input-status" name="status">
 				<option value=""<?= $selected_all?>>All</option>
 				<option value="1"<?= $selected_succ ?>>Success!</option>
 				<option value="2"<?= $selected_fail ?>>Failed.</option>
diff --git a/web/app/libs/uoj-form-lib.php b/web/app/libs/uoj-form-lib.php
index e294175..b44bb54 100644
--- a/web/app/libs/uoj-form-lib.php
+++ b/web/app/libs/uoj-form-lib.php
@@ -123,7 +123,7 @@ EOD;
 <div id="div-$name" class="form-group">
 	<label for="input-$name" class="col-sm-2 control-label">$label_text</label>
 	<div class="col-sm-3">
-		<select class="form-control" id="input-$name" name="$name">
+		<select class="form-control form-select" id="input-$name" name="$name">
 
 EOD;
 			foreach ($options as $opt_name => $opt_label) {
@@ -161,7 +161,7 @@ EOD;
 			$html = <<<EOD
 <div id="div-$name">
 	<label for="input-$name" class="control-label">$label_text</label>
-	<select class="form-control" id="input-{$name}" name="$name">
+	<select class="form-control form-select" id="input-{$name}" name="$name">
 
 EOD;
 			foreach ($options as $opt_name => $opt_label) {