How do I upgrade to get past level 37 in sweet tooth town

[selavn]

I can’t get past level 37 it tells me I need to upgrade but it don’t let me upgrade

[martoman129]

Hi Selavn, which shop are you playing in that you can't get past Level 37? I've mastered every shop and am maxed out on growth so can definitely help you if you give me more information. Please respond at your convenience, and thanks!

[mcrorka1958EM]

@martoman129 please tell me how to upgrade, because it won't let me wither?

[msuz]

@martoman129 How do u upgrade so you can play other levels?