How do I clear the red alert dot from my FB app?

[Ookami_Seiza]

I have a Samsung Galaxy A5. I have no new notifications from FB but yet the red dot keeps telling me I have 6 constantly. How do I get rid of it without deleting all my notifications from FB itself, please?

 

[DsM]

You have gone to Playstore and checked there's no update waiting for download?