Update README.md to include Issue #774

#774

Author: javiercastrode

README.md

@@ -205,6 +205,8 @@ Before updating, the updater will create a backup. Your instance won’t save mo
 
 If you switched your database to MySQL, your database will not be included in the backup.
 
+The updater may fail without throwing an error and just remain on the current version if there are unmet dependencies. This could include not having the correct version of the dependencies (eg. having php-sqlite3 pointing to php8.3-sqlite3, while LinkStack uses PHP 8.2 and needs php8.2-sqlite3). To troubleshoot, update manually and check the errors thown by the instance when accessing the website, as well as the PHP version reported.
+
 <a name="Discord"></a>
 ## Discord