diff --git a/build.mjs b/build.mjs
index 275bb06..8321d4e 100644
--- a/build.mjs
+++ b/build.mjs
@@ -1,4 +1,4 @@
-import dts from 'bun-plugin-dts'
+import dts from 'bun-plugin-dts';
 
 await Bun.build({
   entrypoints: ['./src/index.ts'],
@@ -10,4 +10,4 @@ await Bun.build({
   plugins: [
     dts(),
   ],
-})
+});
diff --git a/bun.lockb b/bun.lockb
index 4b49d0c..2ddf860 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 88d15f9..bd1369a 100644
--- a/package.json
+++ b/package.json
@@ -33,14 +33,14 @@
   "license": "MIT",
   "devDependencies": {
     "i18next": "^23.5.1",
-    "bun-plugin-dts": "^0.1.0",
-    "bun-types": "latest",
-    "elysia": "^1.0.5",
+    "bun-plugin-dts": "^0.3.0",
+    "bun-types": "^1.1.30",
+    "elysia": "^1.1.22",
     "prettier": "^3.0.3",
     "typescript": "^5.2.2"
   },
   "peerDependencies": {
-    "elysia": ">= 0.7.1",
+    "elysia": ">= 1.0.1",
     "i18next": ">= 23.5.1"
   }
 }
diff --git a/src/index.ts b/src/index.ts
index bbe4641..5c3f294 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -35,7 +35,7 @@ export function newLanguageDetector(opts: LanguageDetectorOptions): LanguageDete
 
     const cookie = set.cookie ? set.cookie[opts.cookieName] : null
     if (cookie && cookie.value) {
-      return cookie.value
+      return cookie.value as string
     }
 
     if (params && opts.pathParamName in params) {
@@ -82,7 +82,7 @@ export const i18next = (userOptions: Partial<I18NextPluginOptions>) => {
     })
     .onBeforeHandle({ as: "global" }, async ctx => {
       const lng = await options.detectLanguage(ctx)
-      if (lng) {
+      if (typeof lng === 'string') {
         await _instance.changeLanguage(lng)
       }
     })