diff --git a/apps/dav/lib/Migration/Version1036Date20251202000000.php b/apps/dav/lib/Migration/Version1036Date20251202000000.php
new file mode 100644
index 0000000000000..745a9a019059d
--- /dev/null
+++ b/apps/dav/lib/Migration/Version1036Date20251202000000.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\Attributes\ColumnType;
+use OCP\Migration\Attributes\ModifyColumn;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+use Override;
+
+#[ModifyColumn(table: 'calendarobjects', name: 'uid', type: ColumnType::STRING, description: 'Increase uid length to 512 characters')]
+#[ModifyColumn(table: 'calendar_reminders', name: 'uid', type: ColumnType::STRING, description: 'Increase uid length to 512 characters')]
+#[ModifyColumn(table: 'calendar_invitations', name: 'uid', type: ColumnType::STRING, description: 'Increase uid length to 512 characters')]
+class Version1036Date20251202000000 extends SimpleMigrationStep {
+	/**
+	 * @param Closure(): ISchemaWrapper $schemaClosure
+	 */
+	#[Override]
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+		$modified = false;
+
+		$table = $schema->getTable('calendarobjects');
+		$column = $table->getColumn('uid');
+		if ($column->getLength() < 512) {
+			$column->setLength(512);
+			$modified = true;
+		}
+
+		$table = $schema->getTable('calendar_reminders');
+		$column = $table->getColumn('uid');
+		if ($column->getLength() < 512) {
+			$column->setLength(512);
+			$modified = true;
+		}
+
+		$table = $schema->getTable('calendar_invitations');
+		$column = $table->getColumn('uid');
+		if ($column->getLength() < 512) {
+			$column->setLength(512);
+			$modified = true;
+		}
+
+		return $modified ? $schema : null;
+	}
+}