diff --git a/index.js b/index.js
index 77a2f19..633c1b6 100644
--- a/index.js
+++ b/index.js
@@ -71,7 +71,7 @@ fastify.post('/login', async (request, reply) => {
                 user: {
                     uid: res.authUser.uid,
                     givenName: res.authUser.givenName,
-                    isAdmin: AdminUsersUid.contains(res.authUser.uid)
+                    isAdmin: AdminUsersUid.includes(res.authUser.uid)
                 },
                 token: UsersToken[res.authUser.uid].token
             }
@@ -118,7 +118,7 @@ fastify.post('/addPrank', async (request, reply) => {
                     && "supplement" in content) {
                         let amount = parseInt(content.amount)
                         if (!isNaN(amount)) {
-                            if (!Supplements.contains(content.supplement)) {
+                            if (!Supplements.includes(content.supplement)) {
                                 if (amount < MaxAmountCrepe) {
                                     let prankUid = makeid(16);
                                     PrankData[prankUid] = {