diff --git a/modules/sheets/PokemonItemSheet.js b/modules/sheets/PokemonItemSheet.js
index c41abe5..142abe6 100644
--- a/modules/sheets/PokemonItemSheet.js
+++ b/modules/sheets/PokemonItemSheet.js
@@ -1,4 +1,4 @@
-export default class PokemonItemSheet extends ItemSheet {
+export default class PokemonItemSheet extends foundry.appv1.sheets.ItemSheet {
     get template() {
         return `systems/pokemon/templates/sheets/${this.item.type}-sheet.html`
     }
diff --git a/pokemon.js b/pokemon.js
index 7614cd0..052f644 100644
--- a/pokemon.js
+++ b/pokemon.js
@@ -3,6 +3,6 @@ import PokemonItemSheet from "./modules/sheets/PokemonItemSheet.js";
 Hooks.once("init", function() {
     console.log("pokemon | Initializing the Pokémon system");
 
-    Items.unregisterSheet("core", ItemSheet);
-    Items.registerSheet("pokemon", PokemonItemSheet, { makeDefault: true });
+    foundry.documents.collections.Items.unregisterSheet("core", foundry.appv1.sheets.ItemSheet);
+    foundry.documents.collections.Items.registerSheet("pokemon", PokemonItemSheet, { makeDefault: true });
 });
\ No newline at end of file
diff --git a/system.json b/system.json
index 960323c..70447bf 100644
--- a/system.json
+++ b/system.json
@@ -1,5 +1,5 @@
 {
-    "version": "0.0.6",
+    "version": "0.0.7",
     "id": "pokemon",
     "title": "Pokémon TTRPG",
     "description": "A Pokémon TTRPG",
diff --git a/system.zip b/system.zip
index 1e72dc2..13d2664 100644
Binary files a/system.zip and b/system.zip differ