diff --git a/content/newsletter.en.html b/content/newsletter.en.html
index 9c309a6..c7418d1 100644
--- a/content/newsletter.en.html
+++ b/content/newsletter.en.html
@@ -25,7 +25,7 @@ title = "Subscribe to our newsletter"
         <input type="hidden" name="lang" value="en" />
         <input type="email" name="email" required placeholder="j.postel@isi.edu" class="form-control mb-3">
         <input type="text" name="name" placeholder="Name (optional)" class="form-control mb-3">
-        <div class="mb-2 mx-auto h-captcha" data-sitekey="12a1e811-7f34-44ca-9e7c-fb1e9ade6b00"></div>
+        <altcha-widget floating class="mb-2 mx-auto" challengeurl="https://lists.happydomain.org/api/public/captcha/altcha"></altcha-widget>
         <button type="submit" class="btn btn-lg btn-primary py-2" data-umami-event="cta-newsletter-join">
           Join our newsletter
         </button>
diff --git a/content/newsletter.fr.html b/content/newsletter.fr.html
index b5b6fd6..3b7e483 100644
--- a/content/newsletter.fr.html
+++ b/content/newsletter.fr.html
@@ -25,7 +25,7 @@ title = "Rejoindre notre newsletter"
         <input type="hidden" name="lang" value="en" />
         <input type="email" name="email" required placeholder="j.postel@isi.edu" class="form-control mb-3">
         <input type="text" name="name" placeholder="Nom (optionnel)" class="form-control mb-3">
-        <div class="mb-2 mx-auto h-captcha" data-sitekey="12a1e811-7f34-44ca-9e7c-fb1e9ade6b00"></div>
+        <altcha-widget floating class="mb-2 mx-auto" challengeurl="https://lists.happydomain.org/api/public/captcha/altcha"></altcha-widget>
         <button type="submit" class="btn btn-lg btn-primary py-2" data-umami-event="cta-newsletter-join">
           Rejoindre notre newsletter
         </button>
diff --git a/layouts/partials/cta-newsletter.html b/layouts/partials/cta-newsletter.html
index 23ea987..a8f879b 100644
--- a/layouts/partials/cta-newsletter.html
+++ b/layouts/partials/cta-newsletter.html
@@ -39,10 +39,11 @@
                             placeholder="j.postel@isi.edu"
                             class="form-control my-3"
                         />
-                        <div
-                            class="my-2 mx-auto h-captcha"
-                            data-sitekey="12a1e811-7f34-44ca-9e7c-fb1e9ade6b00"
-                        ></div>
+                        <altcha-widget
+                            floating
+                            class="my-2 mx-auto"
+                            challengeurl="https://lists.happydomain.org/api/public/captcha/altcha"
+                        ></altcha-widget>
                         <button
                             type="submit"
                             class="btn btn-lg btn-primary py-2"
diff --git a/layouts/partials/jumbo.html b/layouts/partials/jumbo.html
index b0c59ce..1ada856 100644
--- a/layouts/partials/jumbo.html
+++ b/layouts/partials/jumbo.html
@@ -172,6 +172,10 @@
                         placeholder="j.postel@isi.edu"
                         class="form-control"
                     />
+                    <altcha-widget
+                        floating
+                        challengeurl="https://lists.happydomain.org/api/public/captcha/altcha"
+                    ></altcha-widget>
                     <button
                         type="submit"
                         class="btn btn-primary text-nowrap"
diff --git a/layouts/partials/scripts.html b/layouts/partials/scripts.html
index e1e935f..730f2cf 100644
--- a/layouts/partials/scripts.html
+++ b/layouts/partials/scripts.html
@@ -1,5 +1,5 @@
 <script src="/js/bootstrap.bundle.min.js"></script>
-<script src="https://js.hcaptcha.com/1/api.js" async defer></script>
+<script src="https://lists.happydomain.org/public/static/altcha.umd.js" async defer></script>
 <script>
     window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function(e) {
         document.documentElement.setAttribute('data-bs-theme', e.matches ? 'dark' : 'light');