diff --git a/__tests__/actions/auth.test.ts b/__tests__/actions/auth.test.ts
index 424e31b..a5a9be7 100644
--- a/__tests__/actions/auth.test.ts
+++ b/__tests__/actions/auth.test.ts
@@ -1,10 +1,19 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest'
 
-const { redirectMock, verifyUserMock, headerGetMock, sessionSaveMock } = vi.hoisted(() => ({
+const {
+  redirectMock,
+  verifyUserMock,
+  headerGetMock,
+  sessionSaveMock,
+  requireSessionMock,
+  prismaUserUpdateMock,
+} = vi.hoisted(() => ({
   redirectMock: vi.fn((path: string) => { throw new Error(`REDIRECT:${path}`) }),
   verifyUserMock: vi.fn(),
   headerGetMock: vi.fn(),
   sessionSaveMock: vi.fn(),
+  requireSessionMock: vi.fn(),
+  prismaUserUpdateMock: vi.fn(),
 }))
 
 vi.mock('next/navigation', () => ({ redirect: redirectMock }))
@@ -23,10 +32,15 @@ vi.mock('@/lib/session', () => ({ sessionOptions: { cookieName: 't', password: '
 vi.mock('@/lib/auth', () => ({
   verifyUser: verifyUserMock,
   registerUser: vi.fn(),
+  hashPassword: vi.fn().mockResolvedValue('hashed'),
+}))
+vi.mock('@/lib/auth-guard', () => ({ requireSession: requireSessionMock }))
+vi.mock('@/lib/prisma', () => ({
+  prisma: { user: { update: prismaUserUpdateMock } },
 }))
 vi.mock('@/lib/rate-limit', () => ({ checkRateLimit: vi.fn().mockReturnValue(true) }))
 
-import { loginAction } from '@/actions/auth'
+import { loginAction, resetPasswordAction } from '@/actions/auth'
 
 const IPHONE_UA = 'Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) Mobile/15E148 Safari/604.1'
 const IPAD_UA = 'Mozilla/5.0 (iPad; CPU OS 17_4 like Mac OS X) Safari/604.1'
@@ -44,6 +58,8 @@ beforeEach(() => {
   verifyUserMock.mockReset()
   headerGetMock.mockReset()
   sessionSaveMock.mockReset()
+  requireSessionMock.mockReset()
+  prismaUserUpdateMock.mockReset()
 })
 
 describe('loginAction UA-redirect', () => {
@@ -83,3 +99,37 @@ describe('loginAction UA-redirect', () => {
     await expect(loginAction(undefined, fd('demo', 'demo123pw'))).rejects.toThrow('REDIRECT:/m/products/p1/solo')
   })
 })
+
+describe('resetPasswordAction', () => {
+  function fdReset(password: string, confirm: string) {
+    const f = new FormData()
+    f.set('password', password)
+    f.set('confirm', confirm)
+    return f
+  }
+
+  it('redirect /dashboard na succesvolle reset', async () => {
+    requireSessionMock.mockResolvedValue({ userId: 'u1' })
+    prismaUserUpdateMock.mockResolvedValue({})
+    await expect(resetPasswordAction(undefined, fdReset('nieuwpass1', 'nieuwpass1'))).rejects.toThrow('REDIRECT:/dashboard')
+    expect(prismaUserUpdateMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: { id: 'u1' },
+        data: expect.objectContaining({ password_hash: 'hashed', must_reset_password: false }),
+      })
+    )
+  })
+
+  it('fout als wachtwoorden niet overeenkomen', async () => {
+    requireSessionMock.mockResolvedValue({ userId: 'u1' })
+    const result = await resetPasswordAction(undefined, fdReset('nieuwpass1', 'anderpass1'))
+    expect(result).toMatchObject({ error: expect.objectContaining({ confirm: expect.any(Array) }) })
+    expect(prismaUserUpdateMock).not.toHaveBeenCalled()
+  })
+
+  it('fout als wachtwoord te kort is', async () => {
+    requireSessionMock.mockResolvedValue({ userId: 'u1' })
+    const result = await resetPasswordAction(undefined, fdReset('kort', 'kort'))
+    expect(result).toMatchObject({ error: expect.objectContaining({ password: expect.any(Array) }) })
+  })
+})
diff --git a/actions/auth.ts b/actions/auth.ts
index 575178e..d40d188 100644
--- a/actions/auth.ts
+++ b/actions/auth.ts
@@ -4,10 +4,12 @@ import { redirect } from 'next/navigation'
 import { cookies, headers } from 'next/headers'
 import { getIronSession } from 'iron-session'
 import { z } from 'zod'
-import { registerUser, verifyUser } from '@/lib/auth'
+import { prisma } from '@/lib/prisma'
+import { registerUser, verifyUser, hashPassword } from '@/lib/auth'
 import { SessionData, sessionOptions } from '@/lib/session'
 import { checkRateLimit } from '@/lib/rate-limit'
 import { isPhoneUA } from '@/lib/user-agent'
+import { requireSession } from '@/lib/auth-guard'
 
 async function getClientIp(): Promise<string> {
   const h = await headers()
@@ -90,3 +92,39 @@ export async function logoutAction() {
   session.destroy()
   redirect('/login')
 }
+
+const resetPasswordSchema = z
+  .object({
+    password: z.string().min(8, 'Wachtwoord moet minimaal 8 tekens bevatten'),
+    confirm: z.string(),
+  })
+  .superRefine((data, ctx) => {
+    if (data.password !== data.confirm) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: 'Wachtwoorden komen niet overeen',
+        path: ['confirm'],
+      })
+    }
+  })
+
+export async function resetPasswordAction(_prevState: unknown, formData: FormData) {
+  const session = await requireSession()
+
+  const parsed = resetPasswordSchema.safeParse({
+    password: formData.get('password'),
+    confirm: formData.get('confirm'),
+  })
+
+  if (!parsed.success) {
+    return { error: parsed.error.flatten().fieldErrors }
+  }
+
+  const hash = await hashPassword(parsed.data.password)
+  await prisma.user.update({
+    where: { id: session.userId },
+    data: { password_hash: hash, must_reset_password: false },
+  })
+
+  redirect('/dashboard')
+}
diff --git a/app/(auth)/reset-password/page.tsx b/app/(auth)/reset-password/page.tsx
new file mode 100644
index 0000000..c38ec5f
--- /dev/null
+++ b/app/(auth)/reset-password/page.tsx
@@ -0,0 +1,37 @@
+import { redirect } from 'next/navigation'
+import { getSession } from '@/lib/auth'
+import { prisma } from '@/lib/prisma'
+import { ResetPasswordForm } from './reset-form'
+
+export default async function ResetPasswordPage() {
+  const session = await getSession()
+  if (!session.userId) {
+    redirect('/login')
+  }
+
+  const user = await prisma.user.findUnique({
+    where: { id: session.userId },
+    select: { must_reset_password: true },
+  })
+
+  if (!user?.must_reset_password) {
+    redirect('/dashboard')
+  }
+
+  return (
+    <main className="min-h-screen bg-background flex items-center justify-center p-4">
+      <div className="w-full max-w-sm space-y-6">
+        <div className="text-center space-y-1">
+          <h1 className="text-2xl font-medium text-foreground">Wachtwoord wijzigen</h1>
+          <p className="text-sm text-muted-foreground">
+            Kies een nieuw wachtwoord om verder te gaan.
+          </p>
+        </div>
+
+        <div className="bg-surface-container-low rounded-xl p-6 space-y-4 border border-border">
+          <ResetPasswordForm />
+        </div>
+      </div>
+    </main>
+  )
+}
diff --git a/app/(auth)/reset-password/reset-form.tsx b/app/(auth)/reset-password/reset-form.tsx
new file mode 100644
index 0000000..85f44f2
--- /dev/null
+++ b/app/(auth)/reset-password/reset-form.tsx
@@ -0,0 +1,74 @@
+'use client'
+
+import { useActionState } from 'react'
+import { useFormStatus } from 'react-dom'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { resetPasswordAction } from '@/actions/auth'
+
+type ActionResult = { error: string | Record<string, string[]> } | undefined
+
+function SubmitButton() {
+  const { pending } = useFormStatus()
+  return (
+    <Button type="submit" className="w-full" disabled={pending}>
+      {pending ? 'Even wachten…' : 'Wachtwoord opslaan'}
+    </Button>
+  )
+}
+
+function getErrorMessage(error: ActionResult): string | null {
+  if (!error) return null
+  if (typeof error.error === 'string') return error.error
+  const first = Object.values(error.error).flat()[0]
+  return first ?? null
+}
+
+export function ResetPasswordForm() {
+  const [state, formAction] = useActionState(resetPasswordAction, undefined)
+  const errorMessage = getErrorMessage(state)
+
+  return (
+    <form action={formAction} className="space-y-4">
+      <div className="space-y-2">
+        <label htmlFor="password" className="text-sm font-medium text-foreground">
+          Nieuw wachtwoord
+        </label>
+        <Input
+          id="password"
+          name="password"
+          type="password"
+          autoComplete="new-password"
+          required
+          minLength={8}
+          placeholder="••••••••"
+          className="bg-input-background border-border focus-visible:ring-primary"
+        />
+      </div>
+
+      <div className="space-y-2">
+        <label htmlFor="confirm" className="text-sm font-medium text-foreground">
+          Bevestig wachtwoord
+        </label>
+        <Input
+          id="confirm"
+          name="confirm"
+          type="password"
+          autoComplete="new-password"
+          required
+          minLength={8}
+          placeholder="••••••••"
+          className="bg-input-background border-border focus-visible:ring-primary"
+        />
+      </div>
+
+      {errorMessage && (
+        <div className="bg-error-container text-error-container-foreground rounded-lg px-3 py-2 text-sm border-l-4 border-error">
+          {errorMessage}
+        </div>
+      )}
+
+      <SubmitButton />
+    </form>
+  )
+}
diff --git a/lib/auth.ts b/lib/auth.ts
index 52cede1..027e9aa 100644
--- a/lib/auth.ts
+++ b/lib/auth.ts
@@ -66,3 +66,7 @@ export async function verifyUser(username: string, password: string) {
 
   return user
 }
+
+export async function hashPassword(password: string): Promise<string> {
+  return bcrypt.hash(password, 12)
+}