diff --git a/src/Security/TwoFactor/Model/RecoveryCode.php b/src/Security/TwoFactor/Model/RecoveryCode.php
index 2669ae18e4..b3c197f98e 100644
--- a/src/Security/TwoFactor/Model/RecoveryCode.php
+++ b/src/Security/TwoFactor/Model/RecoveryCode.php
@@ -35,10 +35,11 @@ class RecoveryCode
      * Returns the number of code the provided users can still use to replace a TOTP code
      *
      * @param int $uid User ID
+     *
      * @return int
      * @throws \Exception
      */
-    public static function countValidForUser($uid)
+    public static function countValidForUser(int $uid): int
 	{
 		return DBA::count('2fa_recovery_codes', ['uid' => $uid, 'used' => null]);
 	}
@@ -46,12 +47,13 @@ class RecoveryCode
     /**
      * Checks the provided code is available to use for login by the provided user
      *
-     * @param  int $uid User ID
+     * @param int $uid User ID
      * @param string $code
+     *
      * @return bool
      * @throws \Exception
      */
-	public static function existsForUser($uid, $code)
+	public static function existsForUser(int $uid, string $code): bool
 	{
 		return DBA::exists('2fa_recovery_codes', ['uid' => $uid, 'code' => $code, 'used' => null]);
 	}
@@ -60,10 +62,11 @@ class RecoveryCode
      * Returns a complete list of all recovery codes for the provided user, including the used status
      *
      * @param  int $uid User ID
+     *
      * @return array
      * @throws \Exception
      */
-	public static function getListForUser($uid)
+	public static function getListForUser(int $uid): array
 	{
 		$codesStmt = DBA::select('2fa_recovery_codes', ['code', 'used'], ['uid' => $uid]);
 
@@ -76,10 +79,11 @@ class RecoveryCode
      *
      * @param  int $uid User ID
      * @param string $code
+     *
      * @return bool
      * @throws \Exception
      */
-	public static function markUsedForUser($uid, $code)
+	public static function markUsedForUser(int $uid, string $code): bool
 	{
 		DBA::update('2fa_recovery_codes', ['used' => DateTimeFormat::utcNow()], ['uid' => $uid, 'code' => $code, 'used' => null]);
 
@@ -91,9 +95,11 @@ class RecoveryCode
      * Generates 12 codes constituted of 2 blocks of 6 characters separated by a dash.
      *
      * @param  int $uid User ID
+     * @return void
+     *
      * @throws \Exception
      */
-	public static function generateForUser($uid)
+	public static function generateForUser(int $uid)
 	{
 		$Random = (new Random())->pattern('[a-z0-9]');
 
@@ -120,9 +126,11 @@ class RecoveryCode
      * Deletes all the recovery codes for the provided user.
      *
      * @param  int $uid User ID
+     * @return void
+     *
      * @throws \Exception
      */
-	public static function deleteForUser($uid)
+	public static function deleteForUser(int $uid)
 	{
 		DBA::delete('2fa_recovery_codes', ['uid' => $uid]);
 	}
@@ -131,9 +139,11 @@ class RecoveryCode
      * Replaces the existing recovery codes for the provided user by a freshly generated set.
      *
      * @param  int $uid User ID
+     * @return void
+     *
      * @throws \Exception
      */
-	public static function regenerateForUser($uid)
+	public static function regenerateForUser(int $uid)
 	{
 		self::deleteForUser($uid);
 		self::generateForUser($uid);
diff --git a/src/Security/TwoFactor/Repository/TrustedBrowser.php b/src/Security/TwoFactor/Repository/TrustedBrowser.php
index a261d92ca0..d913be3c9b 100644
--- a/src/Security/TwoFactor/Repository/TrustedBrowser.php
+++ b/src/Security/TwoFactor/Repository/TrustedBrowser.php
@@ -143,6 +143,7 @@ class TrustedBrowser
 
 	/**
 	 * @param int $local_user
+	 *
 	 * @return bool
 	 */
 	public function removeAllForUser(int $local_user): bool