diff --git a/appinfo/info.xml b/appinfo/info.xml
index 2a8504e7c68..07228f7ea10 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -11,7 +11,7 @@
 - **💾 Open format:** Files are saved as [Markdown](https://en.wikipedia.org/wiki/Markdown), so you can edit them from any other text app too.
 - **✊ Strong foundation:** We use [🐈 tiptap](https://tiptap.scrumpy.io) which is based on [🦉 ProseMirror](https://prosemirror.net) – huge thanks to them!
 	]]></description>
-	<version>3.5.0</version>
+	<version>3.5.1</version>
 	<licence>agpl</licence>
 	<author mail="jus@bitgrid.net">Julius Härtl</author>
 	<namespace>Text</namespace>
diff --git a/lib/Migration/Version010000Date20190617184535.php b/lib/Migration/Version010000Date20190617184535.php
index d71bc9d0eca..aaafc11820b 100644
--- a/lib/Migration/Version010000Date20190617184535.php
+++ b/lib/Migration/Version010000Date20190617184535.php
@@ -101,6 +101,7 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			]);
 			$table->setPrimaryKey(['id']);
 			$table->addIndex(['token'], 'rd_session_token_idx');
+			$table->addIndex(['last_contact'], 'ts_lastcontact');
 		}
 
 		if (!$schema->hasTable('text_steps')) {
diff --git a/lib/Migration/Version030501Date20220202101853.php b/lib/Migration/Version030501Date20220202101853.php
new file mode 100644
index 00000000000..dcdede67e41
--- /dev/null
+++ b/lib/Migration/Version030501Date20220202101853.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\Text\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+/**
+ * Auto-generated migration step: Please modify to your needs!
+ */
+class Version030501Date20220202101853 extends SimpleMigrationStep {
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('text_sessions');
+		if (!$table->hasIndex('ts_lastcontact')) {
+			$table->addIndex(['last_contact'], 'ts_lastcontact');
+			return $schema;
+		}
+
+		return null;
+	}
+}