I'm using version 3.9.0+180604.
Off-topic: You (or your organization) should really look into updating your Limesurvey installation. Your installation hasn't received any update, bug fix or security fix for over 3 years now.
Based on your name I assume that you are from a German speaking country, which afaik all fall under GDPR/DSVGO. One of the principles is to use "state of the art software" and I think one can hardly say that a software that potentially collects personal data is "state of the art" if it hasn't been updated for more than 3 years (despite many updates being available).
But even if you do not collect personal data or do not fall under GDPR/DSVGO, it is highly recommended to keep up to date with updates, as the principle of keeping software up to date is never wrong.