diff --git a/deno.json b/deno.json
index 80c58382..db38e978 100644
--- a/deno.json
+++ b/deno.json
@@ -72,7 +72,7 @@
     "fast-stable-stringify": "npm:fast-stable-stringify@^1.0.0",
     "formdata-helper": "npm:formdata-helper@^0.3.0",
     "hono-rate-limiter": "npm:hono-rate-limiter@^0.3.0",
-    "iso-639-1": "npm:iso-639-1@2.1.15",
+    "iso-639-1": "npm:iso-639-1@^3.1.5",
     "isomorphic-dompurify": "npm:isomorphic-dompurify@^2.16.0",
     "kysely": "npm:kysely@^0.27.4",
     "kysely-postgres-js": "npm:kysely-postgres-js@2.0.0",
diff --git a/deno.lock b/deno.lock
index 5e4134da..32e9a8bb 100644
--- a/deno.lock
+++ b/deno.lock
@@ -101,7 +101,7 @@
     "npm:fast-stable-stringify@1": "1.0.0",
     "npm:formdata-helper@0.3": "0.3.0",
     "npm:hono-rate-limiter@0.3": "0.3.0_hono@4.2.5",
-    "npm:iso-639-1@2.1.15": "2.1.15",
+    "npm:iso-639-1@^3.1.5": "3.1.5",
     "npm:isomorphic-dompurify@^2.16.0": "2.16.0",
     "npm:kysely-postgres-js@2.0.0": "2.0.0_kysely@0.27.3_postgres@3.4.4",
     "npm:kysely@~0.27.2": "0.27.4",
@@ -1211,8 +1211,8 @@
     "isexe@2.0.0": {
       "integrity": "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw=="
     },
-    "iso-639-1@2.1.15": {
-      "integrity": "sha512-7c7mBznZu2ktfvyT582E2msM+Udc1EjOyhVRE/0ZsjD9LBtWSm23h3PtiRh2a35XoUsTQQjJXaJzuLjXsOdFDg=="
+    "iso-639-1@3.1.5": {
+      "integrity": "sha512-gXkz5+KN7HrG0Q5UGqSMO2qB9AsbEeyLP54kF1YrMsIxmu+g4BdB7rflReZTSTZGpfj8wywu6pfPBCylPIzGQA=="
     },
     "isomorphic-dompurify@2.16.0": {
       "integrity": "sha512-cXhX2owp8rPxafCr0ywqy2CGI/4ceLNgWkWBEvUz64KTbtg3oRL2ZRqq/zW0pzt4YtDjkHLbwcp/lozpKzAQjg==",
@@ -2383,7 +2383,7 @@
       "npm:fast-stable-stringify@1",
       "npm:formdata-helper@0.3",
       "npm:hono-rate-limiter@0.3",
-      "npm:iso-639-1@2.1.15",
+      "npm:iso-639-1@^3.1.5",
       "npm:isomorphic-dompurify@^2.16.0",
       "npm:kysely-postgres-js@2.0.0",
       "npm:kysely@~0.27.4",
diff --git a/src/config.ts b/src/config.ts
index b65e0cfd..0164182a 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -293,7 +293,7 @@ class Conf {
   }
   /** Languages this server wishes to highlight. Used when querying trends.*/
   static get preferredLanguages(): LanguageCode[] | undefined {
-    return Deno.env.get('DITTO_LANGUAGES')?.split(',')?.filter(ISO6391.validate) as LanguageCode[];
+    return Deno.env.get('DITTO_LANGUAGES')?.split(',')?.filter(ISO6391.validate);
   }
   /** Translation provider used to translate posts. */
   static get translationProvider(): string | undefined {
diff --git a/src/schema.ts b/src/schema.ts
index b55a1f9a..0fce60d4 100644
--- a/src/schema.ts
+++ b/src/schema.ts
@@ -60,7 +60,7 @@ const languageSchema = z.string().transform<LanguageCode>((val, ctx) => {
     });
     return z.NEVER;
   }
-  return val as LanguageCode;
+  return val;
 });
 
 const localeSchema = z.string().transform<Intl.Locale>((val, ctx) => {
diff --git a/src/test.ts b/src/test.ts
index 4e813f05..95aa2872 100644
--- a/src/test.ts
+++ b/src/test.ts
@@ -75,7 +75,7 @@ export function getLanguage(text: string): LanguageCode | undefined {
     const [iso6393] = topResult;
     const locale = new Intl.Locale(iso6393);
     if (ISO6391.validate(locale.language)) {
-      return locale.language as LanguageCode;
+      return locale.language;
     }
   }
   return;
diff --git a/src/translators/DeepLTranslator.ts b/src/translators/DeepLTranslator.ts
index 26067379..d1cefaaa 100644
--- a/src/translators/DeepLTranslator.ts
+++ b/src/translators/DeepLTranslator.ts
@@ -36,7 +36,7 @@ export class DeepLTranslator implements DittoTranslator {
 
     return {
       results: translations.map((value) => value.text),
-      source_lang: translations[0]?.detected_source_language as LanguageCode,
+      source_lang: translations[0]?.detected_source_language,
     };
   }
 
diff --git a/src/utils/language.ts b/src/utils/language.ts
index 4b6e3807..b95e3e78 100644
--- a/src/utils/language.ts
+++ b/src/utils/language.ts
@@ -46,7 +46,7 @@ export function detectLanguage(text: string, minConfidence: number): LanguageCod
     const locale = new Intl.Locale(iso6393);
 
     if (confidence >= minConfidence && ISO6391.validate(locale.language)) {
-      return locale.language as LanguageCode;
+      return locale.language;
     }
   }
 }