diff --git a/package.json b/package.json
index d5678c25..a0016825 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "packageManager": "pnpm@11.10.0",
   "scripts": {
-    "dev": "pnpm --filter '@tinyrack/tinyauth-*' --parallel dev",
+    "dev": "pnpm --filter \"@tinyrack/tinyauth-*\" --parallel dev",
     "test": "node packages/tools/src/scripts/run-validation-tests.ts",
     "build": "pnpm -r --workspace-concurrency=Infinity build",
     "biome": "biome",
diff --git a/packages/frontend/src/i18n/locales/en.json b/packages/frontend/src/i18n/locales/en.json
index bb1e87a5..96cbcb21 100644
--- a/packages/frontend/src/i18n/locales/en.json
+++ b/packages/frontend/src/i18n/locales/en.json
@@ -91,6 +91,7 @@
   "register.submitting": "Creating account...",
   "register.subtitle": "Create a new account to get started",
   "register.title": "Create account",
+  "validation.email.required": "Please enter your email address",
   "validation.email.invalid": "Invalid email format",
   "validation.password.max": "Password must be at most {{count}} characters",
   "validation.password.min": "Password must be at least {{count}} characters",
diff --git a/packages/frontend/src/i18n/locales/ja.json b/packages/frontend/src/i18n/locales/ja.json
index 4d909d15..73cee52e 100644
--- a/packages/frontend/src/i18n/locales/ja.json
+++ b/packages/frontend/src/i18n/locales/ja.json
@@ -91,6 +91,7 @@
   "register.submitting": "アカウント作成中...",
   "register.subtitle": "新しいアカウントを作成して始めましょう",
   "register.title": "アカウント作成",
+  "validation.email.required": "メールアドレスを入力してください",
   "validation.email.invalid": "正しいメールアドレスの形式ではありません",
   "validation.password.max": "パスワードは{{count}}文字以下である必要があります",
   "validation.password.min": "パスワードは{{count}}文字以上である必要があります",
diff --git a/packages/frontend/src/i18n/locales/ko.json b/packages/frontend/src/i18n/locales/ko.json
index 9ee96973..49624fbc 100644
--- a/packages/frontend/src/i18n/locales/ko.json
+++ b/packages/frontend/src/i18n/locales/ko.json
@@ -91,6 +91,7 @@
   "register.submitting": "회원가입 중...",
   "register.subtitle": "새 계정을 만들어 시작하세요",
   "register.title": "계정 만들기",
+  "validation.email.required": "이메일 주소를 입력해주세요",
   "validation.email.invalid": "올바른 이메일 형식이 아닙니다",
   "validation.password.max": "비밀번호는 최대 {{count}}자까지 가능합니다",
   "validation.password.min": "비밀번호는 최소 {{count}}자 이상이어야 합니다",
diff --git a/packages/frontend/src/routes/login/password/index.tsx b/packages/frontend/src/routes/login/password/index.tsx
index c9040e9e..451e7f69 100644
--- a/packages/frontend/src/routes/login/password/index.tsx
+++ b/packages/frontend/src/routes/login/password/index.tsx
@@ -87,7 +87,10 @@ function LoginPassword() {
   const loginSchema = useMemo(
     () =>
       z.object({
-        email: z.email(t('validation.email.invalid')),
+        email: z
+          .string()
+          .min(1, t('validation.email.required'))
+          .pipe(z.email(t('validation.email.invalid'))),
         password: z.string().min(1, t('validation.password.required')),
       }),
     [t],
diff --git a/packages/frontend/src/routes/password/forgot/index.tsx b/packages/frontend/src/routes/password/forgot/index.tsx
index 02469a02..0b7a6f78 100644
--- a/packages/frontend/src/routes/password/forgot/index.tsx
+++ b/packages/frontend/src/routes/password/forgot/index.tsx
@@ -55,7 +55,10 @@ function ForgotPassword() {
   const forgotPasswordSchema = useMemo(
     () =>
       z.object({
-        email: z.email({ error: t('validation.email.invalid') }),
+        email: z
+          .string()
+          .min(1, t('validation.email.required'))
+          .pipe(z.email(t('validation.email.invalid'))),
       }),
     [t],
   );
diff --git a/packages/frontend/src/routes/register/index.tsx b/packages/frontend/src/routes/register/index.tsx
index 254f4244..ea510cf0 100644
--- a/packages/frontend/src/routes/register/index.tsx
+++ b/packages/frontend/src/routes/register/index.tsx
@@ -116,7 +116,10 @@ function Register() {
   const registerSchema = useMemo(
     () =>
       z.object({
-        email: z.email(t('validation.email.invalid')),
+        email: z
+          .string()
+          .min(1, t('validation.email.required'))
+          .pipe(z.email(t('validation.email.invalid'))),
         password: z
           .string()
           .min(