diff --git a/apps/web/src/utils/dayjs.tsx b/apps/web/src/utils/dayjs.tsx
index cffab6663..7a447cbd4 100644
--- a/apps/web/src/utils/dayjs.tsx
+++ b/apps/web/src/utils/dayjs.tsx
@@ -21,21 +21,17 @@ import { usePreferences } from "@/contexts/preferences";
 import { useTranslation } from "@/i18n/client";
 import { getBrowserTimeZone, normalizeTimeZone } from "@/utils/date-time-utils";
 
+import type { SupportedLocale } from "@rallly/languages";
 import { useRequiredContext } from "../components/use-required-context";
 
 const dayjsLocales: Record<
-  string,
+  SupportedLocale,
   {
     weekStart: number;
     timeFormat: TimeFormat;
     import: () => Promise<ILocale>;
   }
 > = {
-  eu: {
-    weekStart: 1,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/eu"),
-  },
   en: {
     weekStart: 1,
     timeFormat: "hours12",
@@ -51,11 +47,6 @@ const dayjsLocales: Record<
     timeFormat: "hours24",
     import: () => import("dayjs/locale/es"),
   },
-  ca: {
-    weekStart: 1,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/ca"),
-  },
   da: {
     weekStart: 1,
     timeFormat: "hours24",
@@ -76,11 +67,6 @@ const dayjsLocales: Record<
     timeFormat: "hours24",
     import: () => import("dayjs/locale/fr"),
   },
-  hr: {
-    weekStart: 1,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/hr"),
-  },
   it: {
     weekStart: 1,
     timeFormat: "hours24",
@@ -91,11 +77,6 @@ const dayjsLocales: Record<
     timeFormat: "hours24",
     import: () => import("dayjs/locale/sv"),
   },
-  sk: {
-    weekStart: 1,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/sk"),
-  },
   cs: {
     weekStart: 1,
     timeFormat: "hours24",
@@ -141,21 +122,6 @@ const dayjsLocales: Record<
     timeFormat: "hours24",
     import: () => import("dayjs/locale/zh"),
   },
-  "zh-Hant": {
-    weekStart: 0,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/zh-tw"),
-  },
-  vi: {
-    weekStart: 1,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/vi"),
-  },
-  tr: {
-    weekStart: 1,
-    timeFormat: "hours24",
-    import: () => import("dayjs/locale/tr"),
-  },
 };
 
 dayjs.extend(localizedFormat);
@@ -195,7 +161,7 @@ export const useDayjs = () => {
 export const DayjsProvider: React.FunctionComponent<{
   children?: React.ReactNode;
   config?: {
-    locale?: string;
+    locale?: SupportedLocale;
     timeZone?: string;
     localeOverrides?: {
       weekStart?: number;
@@ -281,7 +247,7 @@ export const ConnectedDayjsProvider = ({
   return (
     <DayjsProvider
       config={{
-        locale: i18n.language,
+        locale: i18n.language as SupportedLocale,
         timeZone: preferences.timeZone ?? undefined,
         localeOverrides: {
           weekStart: preferences.weekStart ?? undefined,
diff --git a/packages/languages/src/index.ts b/packages/languages/src/index.ts
index 0260c39f3..b6e1484b3 100644
--- a/packages/languages/src/index.ts
+++ b/packages/languages/src/index.ts
@@ -1,4 +1,6 @@
-import languages from "./languages.json";
+import { languages } from "./languages";
+
+export type SupportedLocale = keyof typeof languages;
 
 export const supportedLngs = Object.keys(languages);
 
diff --git a/packages/languages/src/languages.json b/packages/languages/src/languages.json
deleted file mode 100644
index 83674960e..000000000
--- a/packages/languages/src/languages.json
+++ /dev/null
@@ -1,25 +0,0 @@
-{
-  "eu": "Basque",
-  "ca": "Català",
-  "cs": "Česky",
-  "da": "Dansk",
-  "de": "Deutsch",
-  "en": "English",
-  "en-GB": "English (UK)",
-  "es": "Español",
-  "fr": "Français",
-  "hr": "Hrvatski",
-  "it": "Italiano",
-  "hu": "Magyar",
-  "nl": "Nederlands",
-  "no": "Norsk",
-  "pl": "Polski",
-  "pt-BR": "Português - Brasil",
-  "ru": "Русский",
-  "sk": "Slovenčina",
-  "fi": "Suomi",
-  "sv": "Svenska",
-  "tr": "Türkçe",
-  "zh": "简体中文",
-  "zh-Hant": "繁體中文"
-}
diff --git a/packages/languages/src/languages.ts b/packages/languages/src/languages.ts
new file mode 100644
index 000000000..b3730e3b9
--- /dev/null
+++ b/packages/languages/src/languages.ts
@@ -0,0 +1,20 @@
+export const languages = {
+  cs: "Česky",
+  da: "Dansk",
+  de: "Deutsch",
+  en: "English",
+  "en-GB": "English (UK)",
+  es: "Español",
+  fr: "Français",
+  it: "Italiano",
+  hu: "Magyar",
+  nl: "Nederlands",
+  no: "Norsk",
+  pl: "Polski",
+  pt: "Português",
+  "pt-BR": "Português - Brasil",
+  ru: "Русский",
+  fi: "Suomi",
+  sv: "Svenska",
+  zh: "简体中文",
+};