diff --git a/CI/requirements-mkdocs-material-insider.txt b/CI/requirements-mkdocs-material-insider.txt
index 3767a8bc..fdd3f48e 100644
--- a/CI/requirements-mkdocs-material-insider.txt
+++ b/CI/requirements-mkdocs-material-insider.txt
@@ -1 +1 @@
-git+https://${MKDOCS_GITHUB_USER}:${MKDOCS_GITHUB_TOKEN}@github.com/squidfunk/mkdocs-material-insiders.git@8.3.9-insiders-4.21.0
+git+https://${MKDOCS_GITHUB_USER}:${MKDOCS_GITHUB_TOKEN}@github.com/squidfunk/mkdocs-material-insiders.git@8.5.6-insiders-4.25.4
diff --git a/CI/requirements-mkdocs-material.txt b/CI/requirements-mkdocs-material.txt
index f6118058..6783c52e 100644
--- a/CI/requirements-mkdocs-material.txt
+++ b/CI/requirements-mkdocs-material.txt
@@ -1,2 +1,2 @@
-mkdocs-material==8.3.9
+mkdocs-material==8.5.6
 
diff --git a/custom_theme/main.html b/custom_theme/main.html
index 7f847708..f4d94c20 100644
--- a/custom_theme/main.html
+++ b/custom_theme/main.html
@@ -34,34 +34,6 @@
   {% endif %}
 {% endblock %}
 
-{% block site_nav %}
-  {% if nav %}
-    {% if page.meta and page.meta.hide %}
-      {% set hidden = "hidden" if "navigation" in page.meta.hide %}
-    {% endif %}
-    <div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" {{ hidden }}>
-      <div class="md-sidebar__scrollwrap">
-        <div class="md-sidebar__inner">
-          {% include "partials/nav.html" %}
-        </div>
-        <div id="readthedocs-ethical-ads" class="flat" data-ea-publisher="readthedocs" data-ea-type="image" data-ea-campaign-types="community|house"></div>
-      </div>
-    </div>
-  {% endif %}
-  {% if not "toc.integrate" in features %}
-    {% if page.meta and page.meta.hide %}
-      {% set hidden = "hidden" if "toc" in page.meta.hide %}
-    {% endif %}
-    <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" {{ hidden }}>
-      <div class="md-sidebar__scrollwrap">
-        <div class="md-sidebar__inner">
-          {% include "partials/toc.html" %}
-        </div>
-      </div>
-    </div>
-  {% endif %}
-{% endblock %}
-
 {% block extrahead %}
 <meta name="google-site-verification" content="{{config.extra.analytics.verification}}" />
 {% endblock %}
diff --git a/custom_theme/partials/nav.html b/custom_theme/partials/nav.html
deleted file mode 100644
index 829cd3f7..00000000
--- a/custom_theme/partials/nav.html
+++ /dev/null
@@ -1,27 +0,0 @@
-{% set class = "md-nav md-nav--primary" %}
-{% if "navigation.tabs" in features %}
-  {% set class = class ~ " md-nav--lifted" %}
-{% endif %}
-{% if "toc.integrate" in features %}
-  {% set class = class ~ " md-nav--integrated" %}
-{% endif %}
-<nav class="{{ class }}" aria-label="{{ lang.t('nav.title') }}" data-md-level="0">
-  <label class="md-nav__title" for="__drawer">
-    <a href="{{ config.extra.homepage | d(nav.homepage.url, true) | url }}" title="{{ config.site_name | e }}" class="md-nav__button md-logo" aria-label="{{ config.site_name }}" data-md-component="logo">
-      {% include "partials/logo.html" %}
-    </a>
-    {{ config.site_name }}
-  </label>
-  {% if config.repo_url %}
-    <div class="md-nav__source">
-      {% include "partials/source.html" %}
-    </div>
-  {% endif %}
-  <ul class="md-nav__list" data-md-scrollfix>
-    {% for nav_item in nav %}
-      {% set path = "__nav_" ~ loop.index %}
-      {% set level = 1 %}
-      {% include "partials/nav-item.html" %}
-    {% endfor %}
-  </ul>
-</nav>