diff --git a/app/Http/Middleware/SecurityHeaders.php b/app/Http/Middleware/SecurityHeaders.php
new file mode 100644
index 0000000..03d96e3
--- /dev/null
+++ b/app/Http/Middleware/SecurityHeaders.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class SecurityHeaders
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $response = $next($request);
+
+        $response->headers->set('Strict-Transport-Security', 'max-age=31536000; includeSubDomains');
+        $response->headers->set('X-Content-Type-Options', 'nosniff');
+        $response->headers->set('X-Frame-Options', 'DENY');
+        $response->headers->set('Referrer-Policy', 'strict-origin');
+        $response->headers->set('Permissions-Policy', 'geolocation=(), microphone=(), camera=()');
+
+        return $response;
+    }
+}
diff --git a/bootstrap/app.php b/bootstrap/app.php
index 0039474..2d92cd7 100644
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -15,6 +15,7 @@ return Application::configure(basePath: dirname(__DIR__))
     ->withMiddleware(function (Middleware $middleware): void {
         $middleware->web(append: [
             \App\Http\Middleware\LocaleFromUser::class,
+            \App\Http\Middleware\SecurityHeaders::class,
         ]);
 
         $middleware->validateCsrfTokens(except: [
diff --git a/tests/Feature/Security/SecurityHeadersTest.php b/tests/Feature/Security/SecurityHeadersTest.php
new file mode 100644
index 0000000..fb3b8c6
--- /dev/null
+++ b/tests/Feature/Security/SecurityHeadersTest.php
@@ -0,0 +1,9 @@
+<?php
+
+it('sends HSTS header on all requests', function () {
+    $response = $this->get('/');
+    $response->assertHeader('Strict-Transport-Security');
+    $response->assertHeader('X-Content-Type-Options', 'nosniff');
+    $response->assertHeader('X-Frame-Options', 'DENY');
+    $response->assertHeader('Referrer-Policy', 'strict-origin');
+});