FAQ still states "Em-8ER is being developed in Unreal Engine 4"

[Particle]

I'm not sure if the switch to Unreal Engine 5 is locked in or just in a testing phase for now, but the FAQs on the main website and the forums should probably be updated to reflect the (potential) engine change.

 

[Pandagnome]

Yes they could update stating the main is 4.1 and there is potential to implement 5+ with further testing.

Because nothing is 100% yet until they know if everything is all good