diff --git a/apps/landing/.env.example b/apps/landing/.env.example
index 4b73e25..2e688ee 100644
--- a/apps/landing/.env.example
+++ b/apps/landing/.env.example
@@ -1 +1,2 @@
-NEXT_PUBLIC_API_URL=
\ No newline at end of file
+NEXT_PUBLIC_API_URL=
+NEXT_PUBLIC_TURNSTILE_SITEKEY=1x00000000000000000000AA
\ No newline at end of file
diff --git a/apps/landing/src/app/(auth)/signup/_actions/signup-action.ts b/apps/landing/src/app/(auth)/signup/_actions/signup-action.ts
index a43aa4a..35750fd 100644
--- a/apps/landing/src/app/(auth)/signup/_actions/signup-action.ts
+++ b/apps/landing/src/app/(auth)/signup/_actions/signup-action.ts
@@ -2,6 +2,7 @@
 
 import { z } from 'zod';
 import { fetchPostSignin } from '../_http/fetch-post-signup';
+import { fetchPostverifyTurnstile } from '../_http/fetch-post-verify-turnstile';
 import { signupValidationSchema } from '../_validation/signup-validation';
 
 export async function SignupAction(
@@ -9,7 +10,13 @@ export async function SignupAction(
 ) {
   const validRequest = signupValidationSchema.parse(request);
 
-  const data = await fetchPostSignin({ ...validRequest });
+  const isCapchaValidationValid = await fetchPostverifyTurnstile(
+    validRequest.token
+  );
+
+  if (!isCapchaValidationValid) throw new Error('Failed to verify captcha');
+
+  const data = await fetchPostSignin(validRequest);
 
   return data;
 }
diff --git a/apps/landing/src/app/(auth)/signup/_components/signup-form.tsx b/apps/landing/src/app/(auth)/signup/_components/signup-form.tsx
index dcad592..40fe83f 100644
--- a/apps/landing/src/app/(auth)/signup/_components/signup-form.tsx
+++ b/apps/landing/src/app/(auth)/signup/_components/signup-form.tsx
@@ -11,9 +11,10 @@ import {
   Input,
 } from '@components';
 import { zodResolver } from '@hookform/resolvers/zod';
+import { Turnstile, TurnstileInstance } from '@marsidev/react-turnstile';
 import { useMutation } from '@tanstack/react-query';
 import { useRouter } from 'next/navigation';
-import { useState } from 'react';
+import { useRef, useState } from 'react';
 import { useForm } from 'react-hook-form';
 import { LuLoader } from 'react-icons/lu';
 import { z } from 'zod';
@@ -26,11 +27,31 @@ import {
 
 export function SignupForm() {
   const router = useRouter();
+  const ref = useRef<TurnstileInstance | null>(null);
+
   const [step, setStep] = useState(1);
   const [stepOneData, setStepOneData] = useState<z.infer<
     typeof stepOneSignupValidationSchema
   > | null>(null);
 
+  const firstForm = useForm<z.infer<typeof stepOneSignupValidationSchema>>({
+    resolver: zodResolver(stepOneSignupValidationSchema),
+    defaultValues: {
+      email: '',
+      phone_number: '',
+      fullname: '',
+      password: '',
+      confirm_password: '',
+    },
+  });
+
+  const secondForm = useForm<z.infer<typeof stepTwoSignupValidationSchema>>({
+    resolver: zodResolver(stepTwoSignupValidationSchema),
+    defaultValues: {
+      token: '',
+    },
+  });
+
   const { mutate, isPending, error } = useMutation({
     mutationFn: async (data: z.infer<typeof signupValidationSchema>) => {
       const result = await SignupAction(data);
@@ -44,27 +65,8 @@ export function SignupForm() {
       router.push(`/verification?ref=${email}`);
     },
     onError: () => {
-      secondForm.reset();
-    },
-  });
-
-  const firstForm = useForm<z.infer<typeof stepOneSignupValidationSchema>>({
-    resolver: zodResolver(stepOneSignupValidationSchema),
-    defaultValues: {
-      email: '',
-      fullname: '',
-      password: '',
-      confirm_password: '',
-    },
-  });
-
-  const secondForm = useForm<z.infer<typeof stepTwoSignupValidationSchema>>({
-    resolver: zodResolver(stepTwoSignupValidationSchema),
-    defaultValues: {
-      phone_number: '',
-      referral_code: '',
-      referred_by: '',
-      student_type: '',
+      ref.current?.reset();
+      secondForm.resetField('token');
     },
   });
 
@@ -119,6 +121,20 @@ export function SignupForm() {
               )}
             />
 
+            <FormField
+              control={firstForm.control}
+              name="phone_number"
+              render={({ field }) => (
+                <FormItem>
+                  <FormLabel>Nomor Telepon</FormLabel>
+                  <FormControl>
+                    <Input placeholder="08123456789" {...field} />
+                  </FormControl>
+                  <FormMessage />
+                </FormItem>
+              )}
+            />
+
             <FormField
               control={firstForm.control}
               name="password"
@@ -169,62 +185,15 @@ export function SignupForm() {
               </div>
             )}
 
-            <FormField
-              control={secondForm.control}
-              name="phone_number"
-              render={({ field }) => (
-                <FormItem>
-                  <FormLabel>Nomor Telepon</FormLabel>
-                  <FormControl>
-                    <Input placeholder="081234567890" {...field} />
-                  </FormControl>
-                  <FormMessage />
-                </FormItem>
-              )}
-            />
-
-            <div className="flex gap-x-4">
-              <FormField
-                control={secondForm.control}
-                name="referral_code"
-                render={({ field }) => (
-                  <FormItem>
-                    <FormLabel>Kode Referral</FormLabel>
-                    <FormControl>
-                      <Input placeholder="ABCD" maxLength={4} {...field} />
-                    </FormControl>
-                    <FormMessage />
-                  </FormItem>
-                )}
-              />
-
-              <FormField
-                control={secondForm.control}
-                name="referred_by"
-                render={({ field }) => (
-                  <FormItem>
-                    <FormLabel>Referrer</FormLabel>
-                    <FormControl>
-                      <Input placeholder="Referral ID" {...field} />
-                    </FormControl>
-                    <FormMessage />
-                  </FormItem>
-                )}
-              />
-            </div>
-
-            <FormField
-              control={secondForm.control}
-              name="student_type"
-              render={({ field }) => (
-                <FormItem>
-                  <FormLabel>Status</FormLabel>
-                  <FormControl>
-                    <Input placeholder="e.g., Undergraduate" {...field} />
-                  </FormControl>
-                  <FormMessage />
-                </FormItem>
-              )}
+            <Turnstile
+              ref={ref}
+              siteKey={String(process.env.NEXT_PUBLIC_TURNSTILE_SITEKEY)}
+              onSuccess={(token) => secondForm.setValue('token', token)}
+              options={{
+                theme: 'light',
+                size: 'flexible',
+                language: 'id',
+              }}
             />
 
             <div className="flex justify-between">
@@ -237,8 +206,7 @@ export function SignupForm() {
               </Button>
               <Button
                 type="submit"
-                disabled={isPending}
-                className="flex items-center gap-2 hover:bg-[#5fbaef] bg-[#22a5f1]"
+                disabled={isPending || !secondForm.watch('token')}
               >
                 {isPending ? (
                   <LuLoader className="h-5 w-5 animate-spin" />
diff --git a/apps/landing/src/app/(auth)/signup/_http/fetch-post-signup.ts b/apps/landing/src/app/(auth)/signup/_http/fetch-post-signup.ts
index 3236c49..16e6c16 100644
--- a/apps/landing/src/app/(auth)/signup/_http/fetch-post-signup.ts
+++ b/apps/landing/src/app/(auth)/signup/_http/fetch-post-signup.ts
@@ -6,9 +6,6 @@ export async function fetchPostSignin({
   password,
   fullname,
   phone_number,
-  student_type,
-  referral_code,
-  referred_by,
 }: SignupValidationSchema) {
   const { data, error, response } = await fetcher.POST('/v1/auth/register', {
     body: {
@@ -16,9 +13,6 @@ export async function fetchPostSignin({
       password,
       fullname,
       phone_number,
-      student_type,
-      referral_code,
-      referred_by,
     },
   });
 
diff --git a/apps/landing/src/app/(auth)/signup/_http/fetch-post-verify-turnstile.ts b/apps/landing/src/app/(auth)/signup/_http/fetch-post-verify-turnstile.ts
new file mode 100644
index 0000000..aefeb2d
--- /dev/null
+++ b/apps/landing/src/app/(auth)/signup/_http/fetch-post-verify-turnstile.ts
@@ -0,0 +1,41 @@
+export async function fetchPostverifyTurnstile(
+  token: string,
+  remoteIp?: string
+): Promise<boolean> {
+  const url = 'https://challenges.cloudflare.com/turnstile/v0/siteverify';
+  const params = new URLSearchParams({
+    secret: String(process.env.TURNSTILE_SECRET_KEY),
+    response: token,
+  });
+  if (remoteIp) {
+    params.append('remoteip', remoteIp);
+  }
+
+  const res = await fetch(url, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+    },
+    body: params.toString(),
+  });
+
+  if (!res.ok) {
+    console.error('Turnstile verify HTTP error', res.status);
+    return false;
+  }
+
+  const data = (await res.json()) as TurnstileVerifyResponse;
+  if (!data.success) {
+    console.warn('Turnstile failure', data['error-codes']);
+    return false;
+  }
+
+  return true;
+}
+
+interface TurnstileVerifyResponse {
+  success: boolean;
+  challenge_ts: string;
+  hostname: string;
+  'error-codes'?: string[];
+}
diff --git a/apps/landing/src/app/(auth)/signup/_validation/signup-validation.ts b/apps/landing/src/app/(auth)/signup/_validation/signup-validation.ts
index 1177ab1..65a40a2 100644
--- a/apps/landing/src/app/(auth)/signup/_validation/signup-validation.ts
+++ b/apps/landing/src/app/(auth)/signup/_validation/signup-validation.ts
@@ -37,6 +37,14 @@ export const stepOneSignupValidationSchema = z
         /(?=.*[!@#$%^&*()_\-+={}[\]|\\:;"'<>,.?/~`])/,
         'Password harus mengandung setidaknya satu karakter spesial'
       ),
+    phone_number: z
+      .string({
+        required_error: 'Nomor telepon tidak boleh kosong',
+        invalid_type_error: 'Nomor telepon harus berupa string',
+      })
+      .min(10, 'Nomor telepon tidak boleh kurang dari 10 karakter')
+      .max(15, 'Nomor telepon tidak boleh lebih dari 15 karakter')
+      .regex(/^\d+$/, 'Nomor telepon hanya boleh berisi angka'),
     confirm_password: z
       .string({
         required_error: 'Konfirmasi password tidak boleh kosong',
@@ -50,23 +58,7 @@ export const stepOneSignupValidationSchema = z
   });
 
 export const stepTwoSignupValidationSchema = z.object({
-  phone_number: z
-    .string({
-      required_error: 'Nomor telepon tidak boleh kosong',
-      invalid_type_error: 'Nomor telepon harus berupa string',
-    })
-    .min(10, 'Nomor telepon tidak boleh kurang dari 10 karakter')
-    .max(15, 'Nomor telepon tidak boleh lebih dari 15 karakter')
-    .regex(/^\d+$/, 'Nomor telepon hanya boleh berisi angka'),
-  referral_code: z
-    .string()
-    .max(4, 'Kode referral tidak boleh lebih dari 4 karakter')
-    .optional(),
-  referred_by: z
-    .string()
-    .max(50, 'Kode referral tidak boleh lebih dari 50 karakter')
-    .optional(),
-  student_type: z.string(),
+  token: z.string(),
 });
 
 export const signupValidationSchema = stepOneSignupValidationSchema.and(
diff --git a/apps/landing/src/lib/fetcher.ts b/apps/landing/src/lib/fetcher.ts
index f01c78f..41264c1 100644
--- a/apps/landing/src/lib/fetcher.ts
+++ b/apps/landing/src/lib/fetcher.ts
@@ -2,5 +2,5 @@ import type { paths } from '@/openapi-types';
 import createClient from 'openapi-fetch';
 
 export const fetcher = createClient<paths>({
-  baseUrl: process.env.NEXT_PUBLIC_API_URL ?? 'https://api.imphnen.dev',
+  baseUrl: process.env.NEXT_PUBLIC_API_URL,
 });
diff --git a/apps/landing/src/lib/rpc.ts b/apps/landing/src/lib/rpc.ts
index b045826..96f1b19 100644
--- a/apps/landing/src/lib/rpc.ts
+++ b/apps/landing/src/lib/rpc.ts
@@ -3,6 +3,6 @@ import createFetchClient from 'openapi-fetch';
 import createClient from 'openapi-react-query';
 
 const fetchClient = createFetchClient<paths>({
-  baseUrl: process.env.NEXT_PUBLIC_API_URL ?? 'https://api.imphnen.dev',
+  baseUrl: process.env.NEXT_PUBLIC_API_URL,
 });
 export const rpc = createClient(fetchClient);
diff --git a/package-lock.json b/package-lock.json
index aa37d5e..4f94a5f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "@ant-design/icons": "^6.0.0",
         "@hookform/resolvers": "^5.0.1",
         "@iconify/react": "^6.0.0",
+        "@marsidev/react-turnstile": "^1.1.0",
         "@radix-ui/react-slot": "^1.2.0",
         "@redocly/ajv": "^8.11.2",
         "@tanstack/react-query": "^5.74.4",
@@ -4161,6 +4162,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@marsidev/react-turnstile": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@marsidev/react-turnstile/-/react-turnstile-1.1.0.tgz",
+      "integrity": "sha512-X7bP9ZYutDd+E+klPYF+/BJHqEyyVkN4KKmZcNRr84zs3DcMoftlMAuoKqNSnqg0HE7NQ1844+TLFSJoztCdSA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^17.0.2 || ^18.0.0 || ^19.0",
+        "react-dom": "^17.0.2 || ^18.0.0 || ^19.0"
+      }
+    },
     "node_modules/@mdx-js/react": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/@mdx-js/react/-/react-3.1.0.tgz",
diff --git a/package.json b/package.json
index d9dc304..fbd2264 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
     "@ant-design/icons": "^6.0.0",
     "@hookform/resolvers": "^5.0.1",
     "@iconify/react": "^6.0.0",
+    "@marsidev/react-turnstile": "^1.1.0",
     "@radix-ui/react-slot": "^1.2.0",
     "@redocly/ajv": "^8.11.2",
     "@tanstack/react-query": "^5.74.4",