Heads up, looks like SMAPI .37 reorganized all the events and delegate signatures. For users, it means .36 mods won't work with .37, and vice versa. For modders, almost everything can be fixed by: 1) updating your Entry signature From: public override void Entry() To: public override void Entry(params object[] objects) 2) adding the new events namespace using StardewModdingAPI.Events; 3) finding the new location of the events you want to use: From: Events.SomeEvent += your_handler To: WhateverEventCategoryYouNeed.SomeEvent += your_handler ex: TimeEvents.TimeOfDayChanged += your_handler ex: GameEvents.UpdateTick += your_handler 4) updating your event handler signatures From: void your_handler(and maybe there used to be some params here?) To: void your_handler(object sender, EventArgs e) Fun Note: EventArgs is the base event args class. For some events, it looks like .37 wants to pass proper event args (ex: TimeOfDayChanged passes in EventArgsIntChanged), but it doesn't actually populate the EventArgs (i.e. NewInt and PriorInt both seem to always be 0). So maybe you can't use those, yet. These are the breaking changes I found. Any others?