diff --git a/CHANGES.txt b/CHANGES.txt
index 93eaeefda..5ef6e3de6 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -22,6 +22,7 @@ Other
   promising support for versions supported by the Python core team,
   Ubuntu LTS, or Debian stable, and taking into consideration
   Debian oldstable and PyPy.
+* Remove polyfill from `polyfill.io`.
 
 New in v8.3.0
 =============
diff --git a/docs/manual.rst b/docs/manual.rst
index 0f8f00ea5..57b7b0757 100644
--- a/docs/manual.rst
+++ b/docs/manual.rst
@@ -1690,10 +1690,6 @@ For Mako:
 .. code:: html
 
     % if date_fanciness != 0:
-    %if date_fanciness == 2:
-        <!-- Polyfill for relative dates in Safari -- best handled with a CDN -->
-        <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.${luxon_locales[lang]}"></script>
-    %endif
     <!-- required scripts -- best handled with bundles -->
     <script src="/assets/js/luxon.min.js"></script>
     <script src="/assets/js/fancydates.js"></script>
@@ -1712,10 +1708,6 @@ For Jinja2:
 .. code:: html
 
     {% if date_fanciness != 0 %}
-    {% if date_fanciness == 2 %}
-        <!-- Polyfill for relative dates in Safari -- best handled with a CDN -->
-        <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.{{ luxon_locales[lang] }}"></script>
-    {% endif %}
     <!-- required scripts -- best handled with bundles -->
     <script src="/assets/js/luxon.min.js"></script>
     <script src="/assets/js/fancydates.js"></script>
diff --git a/nikola/data/themes/base-jinja/templates/base_helper.tmpl b/nikola/data/themes/base-jinja/templates/base_helper.tmpl
index 30faac67b..d3fd15337 100644
--- a/nikola/data/themes/base-jinja/templates/base_helper.tmpl
+++ b/nikola/data/themes/base-jinja/templates/base_helper.tmpl
@@ -78,9 +78,6 @@ lang="{{ lang }}">
         {% endif %}
     {% endif %}
     {% if date_fanciness != 0 %}
-        {% if date_fanciness == 2 %}
-            <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.{{ luxon_locales[lang] }}"></script>
-        {% endif %}
         {% if use_cdn %}
             <script src="https://cdn.jsdelivr.net/npm/luxon@3.3.0/build/global/luxon.min.js" integrity="sha256-Nn+JGDrq3PuTxcDfJmmI0Srj5LpfOFlKqEiPwQK7y40=" crossorigin="anonymous"></script>
         {% else %}
diff --git a/nikola/data/themes/base/templates/base_helper.tmpl b/nikola/data/themes/base/templates/base_helper.tmpl
index a03ae5070..a89478ea0 100644
--- a/nikola/data/themes/base/templates/base_helper.tmpl
+++ b/nikola/data/themes/base/templates/base_helper.tmpl
@@ -78,9 +78,6 @@ lang="${lang}">
         % endif
     % endif
     % if date_fanciness != 0:
-        % if date_fanciness == 2:
-            <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.${luxon_locales[lang]}"></script>
-        % endif
         % if use_cdn:
             <script src="https://cdn.jsdelivr.net/npm/luxon@3.3.0/build/global/luxon.min.js" integrity="sha256-Nn+JGDrq3PuTxcDfJmmI0Srj5LpfOFlKqEiPwQK7y40=" crossorigin="anonymous"></script>
         % else:
diff --git a/nikola/data/themes/bootblog4-jinja/templates/base_helper.tmpl b/nikola/data/themes/bootblog4-jinja/templates/base_helper.tmpl
index be879131f..69c31c799 100644
--- a/nikola/data/themes/bootblog4-jinja/templates/base_helper.tmpl
+++ b/nikola/data/themes/bootblog4-jinja/templates/base_helper.tmpl
@@ -82,9 +82,6 @@ lang="{{ lang }}">
         {% endif %}
     {% endif %}
     {% if date_fanciness != 0 %}
-        {% if date_fanciness == 2 %}
-            <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.{{ luxon_locales[lang] }}"></script>
-        {% endif %}
         {% if use_cdn %}
             <script src="https://cdn.jsdelivr.net/npm/luxon@3.3.0/build/global/luxon.min.js" integrity="sha256-Nn+JGDrq3PuTxcDfJmmI0Srj5LpfOFlKqEiPwQK7y40=" crossorigin="anonymous"></script>
         {% else %}
diff --git a/nikola/data/themes/bootblog4/templates/base_helper.tmpl b/nikola/data/themes/bootblog4/templates/base_helper.tmpl
index 7ba4e9256..83b4ce17c 100644
--- a/nikola/data/themes/bootblog4/templates/base_helper.tmpl
+++ b/nikola/data/themes/bootblog4/templates/base_helper.tmpl
@@ -82,9 +82,6 @@ lang="${lang}">
         %endif
     %endif
     %if date_fanciness != 0:
-        %if date_fanciness == 2:
-            <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.${luxon_locales[lang]}"></script>
-        %endif
         %if use_cdn:
             <script src="https://cdn.jsdelivr.net/npm/luxon@3.3.0/build/global/luxon.min.js" integrity="sha256-Nn+JGDrq3PuTxcDfJmmI0Srj5LpfOFlKqEiPwQK7y40=" crossorigin="anonymous"></script>
         %else:
diff --git a/nikola/data/themes/bootstrap4-jinja/templates/base_helper.tmpl b/nikola/data/themes/bootstrap4-jinja/templates/base_helper.tmpl
index 167e8df1f..4c6a12783 100644
--- a/nikola/data/themes/bootstrap4-jinja/templates/base_helper.tmpl
+++ b/nikola/data/themes/bootstrap4-jinja/templates/base_helper.tmpl
@@ -82,9 +82,6 @@ lang="{{ lang }}">
         {% endif %}
     {% endif %}
     {% if date_fanciness != 0 %}
-        {% if date_fanciness == 2 %}
-            <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.{{ luxon_locales[lang] }}"></script>
-        {% endif %}
         {% if use_cdn %}
             <script src="https://cdn.jsdelivr.net/npm/luxon@3.3.0/build/global/luxon.min.js" integrity="sha256-Nn+JGDrq3PuTxcDfJmmI0Srj5LpfOFlKqEiPwQK7y40=" crossorigin="anonymous"></script>
         {% else %}
diff --git a/nikola/data/themes/bootstrap4/templates/base_helper.tmpl b/nikola/data/themes/bootstrap4/templates/base_helper.tmpl
index c5895cd2b..f34a5d8d7 100644
--- a/nikola/data/themes/bootstrap4/templates/base_helper.tmpl
+++ b/nikola/data/themes/bootstrap4/templates/base_helper.tmpl
@@ -82,9 +82,6 @@ lang="${lang}">
         %endif
     %endif
     %if date_fanciness != 0:
-        %if date_fanciness == 2:
-            <script src="https://polyfill.io/v3/polyfill.js?features=Intl.RelativeTimeFormat.%7Elocale.${luxon_locales[lang]}"></script>
-        %endif
         %if use_cdn:
             <script src="https://cdn.jsdelivr.net/npm/luxon@3.3.0/build/global/luxon.min.js" integrity="sha256-Nn+JGDrq3PuTxcDfJmmI0Srj5LpfOFlKqEiPwQK7y40=" crossorigin="anonymous"></script>
         %else: