As you probably know, Minecraft 1.13 was recently released. If you are trying to connect to The Sandlot and get the error "Outdated server!" that means you are trying to connect using Minecraft 1.13. The Sandlot does not yet support this version of Minecraft, so you will need to change the version you use to join us. In the Minecraft launcher, open the Hamburger menu. Select Launch options. Select Add new. Create a new Minecraft Launcher profile. In this example, I called mine Minecraft 1.12.2, but you can call it whatever you want. You can also assign a new icon to it by clicking the furnace and selecting your desired block. For Version, make sure you select release 1.12.2 (or your 1.12.2 optifine version if you use it, as you can see in my example). Select Save at the bottom of the page, then click News in the menu at the top. Click the triangle next to the Play button and select your new profile. Click Play and connect to The Sandlot to start playing!