Love it but needs updating – Sudoku SE Review

I love this app! Have had it a long time and play nearly every day - worked through expert and started over at easy. Unfortunately, I started getting warning messages awhile ago that this app was slowing my phone down - I didn't care. BUT now I got a message telling me the app will eventually not be supported and that I should notify the developer that it needs to be updated. Please update it!
Review by Slevitoo on Sudoku SE.