diff --git a/package.json b/package.json
index d13f4b8..54cf5e6 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "elementipelago",
     "private": true,
-    "version": "0.0.0",
+    "version": "1.0.0",
     "type": "module",
     "scripts": {
         "dev": "vite",
diff --git a/src/consts.js b/src/consts.js
index 6d91d3a..8ea4b8b 100644
--- a/src/consts.js
+++ b/src/consts.js
@@ -1,3 +1,9 @@
 export const LOCATION_AMOUNT = 2000;
 export const INTERMEDIATE_AMOUNT = 1000;
 export const NON_ELEMENT_ITEMS = 100;
+
+export const APWORLD_VERSIONS = ["0.3.x", "1.x.x"];
+
+export const APWORLD_VERSION_REGEX = new RegExp(
+    APWORLD_VERSIONS.map((s) => `^(${s.replace("x", "\\d+")}-?.*)`).join("|"),
+);
diff --git a/src/lib/Login.svelte b/src/lib/Login.svelte
index 7e8ff8b..0d012fe 100644
--- a/src/lib/Login.svelte
+++ b/src/lib/Login.svelte
@@ -2,7 +2,9 @@
     import { get } from "svelte/store";
     import { apclient, slotdata } from "./stores/apclient.svelte";
     import { LoginError } from "archipelago.js";
+    import { APWORLD_VERSION_REGEX, APWORLD_VERSIONS } from "../consts";
 
+    /** @import { SlotData } from "./stores/apclient.svelte"; */
     export let onSubmit;
 
     let host = localStorage.getItem("ap.host") ?? "archipelago.gg:38281";
@@ -19,12 +21,20 @@
             localStorage.setItem("ap.host", host);
             localStorage.setItem("ap.slot", slot);
             localStorage.setItem("ap.password", password);
+
+            /** @type SlotData */
             const response = await get(apclient).login(
                 host,
                 slot,
                 "Elementipelago",
                 password != "" ? { password: password } : {},
             );
+            if (!APWORLD_VERSION_REGEX.test(response.version)) {
+                throw new Error(
+                    `AP world version '${response.version}' is not supported.\n Supported versions include: ${APWORLD_VERSIONS}`,
+                );
+            }
+
             slotdata.set(response);
             onSubmit();
         } catch (e) {
diff --git a/src/lib/stores/apclient.svelte.js b/src/lib/stores/apclient.svelte.js
index 8c254a3..a629731 100644
--- a/src/lib/stores/apclient.svelte.js
+++ b/src/lib/stores/apclient.svelte.js
@@ -23,9 +23,21 @@ import { sendElementToasts, sendUpgradeToasts } from "./toast";
     player: string,
     game: string,
   }} ElementData
+
+  * @typedef {{
+       element_amount: number,
+       intermediate_amount: number,
+       filler_amount: number,
+       compound_amount: number,
+       compounds_are_ingredients: number,
+       graph_seed: number,
+       version: string,
+  * }} SlotData
 */
 
 export const apclient = writable(new Client());
+
+/** @type {Writable<SlotData>} */
 export const slotdata = writable(null);
 /**
  * @type {Writable<Graph>}