Why does Stardew Valley 1.3 break mods? That update includes a huge number of changes to support multiplayer, which breaks most mods that depend on the changed code. SMAPI automatically detects and disables broken mods. How do I update my mods? Follow the instructions on the SMAPI compatibility page. If a mod is still broken, post a message in this thread and we'll help. Make sure to attach your SMAPI log after trying the mod. What do modders need to do? If your mods are broken, see for mod developers.