Uncaught Error: Class 'OTPHP\Base32' not found

Describe the problem you’re having:
Since yesterday I can’t login anymore to my tt-rss instance with the error message
Uncaught Error: Class ‘OTPHP\Base32’ not found

If possible include steps to reproduce the problem:
Try to login with latest git master and internal auth plugin enabled.

tt-rss version (including git commit id):
lastest git master

if you think some change since yesterday broke your login, try going back to earlier changesets.

git log, git checkout, etc.

e: i think the issue is more likely to be found elsewhere though, because recent changes only involved translations and one cosmetic fix for update.php.