Google Play Store 5.9 coming?

I see Google Play Store 5.9 is coming and was wondering how this will effect the Fire Phone?
I just got one off ebay and running 4.6.3 ok now
I see it uses 5.8.8 and seem to be running fine
Seems to be a pain to get the Sim door open, wish they sent a Sim extractor

Can you stop the update or is it automatic update?

Gary