diff --git a/hdbt.info.yml b/hdbt.info.yml
index dfaf27a95..ee7008aa4 100644
--- a/hdbt.info.yml
+++ b/hdbt.info.yml
@@ -3,7 +3,7 @@ description: Base theme for Helsinki Drupal instances.
 type: theme
 base theme: stable9
 tags: sub-theme
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^9 || ^10
 'interface translation project': hdbt
 'interface translation server pattern': themes/contrib/hdbt/translations/%language.po
 
diff --git a/hdbt.theme b/hdbt.theme
index 137cca329..f028ac029 100644
--- a/hdbt.theme
+++ b/hdbt.theme
@@ -1600,9 +1600,12 @@ function hdbt_preprocess_paragraph__event_list(&$variables): void {
     $variables['#attached']['drupalSettings']['helfi_events']['data'][$paragraph->id()] = $settings;
   }
 
+  /** @var \Drupal\Core\Extension\ExtensionPathResolver $extensionPathResolver */
+  $extensionPathResolver = \Drupal::service('extension.path.resolver');
+
   // Render image placeholder for use in frontend.
   $variables['#attached']['drupalSettings']['helfi_events']['imagePlaceholder'] = twig_render_template(
-    drupal_get_path('theme', 'hdbt') . '/templates/misc/image-placeholder.twig',
+    $extensionPathResolver->getPath('theme', 'hdbt') . '/templates/misc/image-placeholder.twig',
     [
       'image_placeholder' => 'calendar-clock',
       'theme_hook_original' => '',
diff --git a/templates/media/media--remote-video.html.twig b/templates/media/media--remote-video.html.twig
index f95bf68b6..235488858 100644
--- a/templates/media/media--remote-video.html.twig
+++ b/templates/media/media--remote-video.html.twig
@@ -52,7 +52,7 @@
           'src': media_attributes.src,
           'height': media_attributes.height,
           'width': media_attributes.width,
-          'title': iframe_title,
+          'title': 'Video: ' ~ iframe_title,
           'type': 'video',
         }
       }
diff --git a/templates/navigation/menu--external-menu--fallback.html.twig b/templates/navigation/menu--external-menu--fallback.html.twig
index bcf7c84c2..789c8ae94 100644
--- a/templates/navigation/menu--external-menu--fallback.html.twig
+++ b/templates/navigation/menu--external-menu--fallback.html.twig
@@ -29,18 +29,18 @@
 
     {# Render "back" menu link. #}
     {% if menu_link_back %}
-      {% spaceless %}
+      {% apply spaceless %}
         {% set menu_link_back_title %}
           <span class="mmenu__back-wrapper">{{ menu_link_back.title }}</span>
         {% endset %}
         {% set link_attributes = {'class': [ 'mmenu__back mmenu__back--in-path' ]} %}
         {{ link(menu_link_back_title, menu_link_back.url, link_attributes) }}
-      {% endspaceless %}
+      {% endapply %}
     {% endif %}
 
     {# Current page link #}
     {% if menu_link_current_or_parent %}
-      {% spaceless %}
+      {% apply spaceless %}
         {% set menu_link_current_or_parent_title %}
           {{ menu_link_current_or_parent.title }}
         {% endset %}
@@ -52,7 +52,7 @@
           'aria-current': menu_link_current_or_parent.is_currentPage ? 'page': null,
         } %}
         {{ link(menu_link_current_or_parent_title, menu_link_current_or_parent.url, link_attributes) }}
-      {% endspaceless %}
+      {% endapply %}
     {% endif %}
 
     {% if items %}
@@ -78,7 +78,7 @@
             {% endset %}
 
             {% if not item.is_nolink %}
-              {% spaceless %}
+              {% apply spaceless %}
                 {% set link_attributes = {
                   'class': [
                     'mmenu__item-link',
@@ -87,7 +87,7 @@
                   'aria-current': item.is_currentPage ? 'page': null,
                 } %}
                 {{ link(item_title, item.url, link_attributes) }}
-              {% endspaceless %}
+              {% endapply %}
             {% else %}
               <span{{ create_attribute({'class': 'mmenu__item__nolink'} ) }}>{{ item_title }}</span>
             {% endif %}
@@ -96,10 +96,10 @@
               {% set next_item_title %}
                 <span class="visually-hidden">{{ 'Open submenu:'|t({}, {'context': 'Mobile navigation submenu prefix'}) }} {{ item_title }}</span>
               {% endset %}
-              {% spaceless %}
+              {% apply spaceless %}
                 {% set link_attributes = { 'class': [ 'mmenu__forward' ] } %}
                 {{ link(next_item_title, item.next_url, link_attributes) }}
-              {% endspaceless %}
+              {% endapply %}
             {% endif %}
           </li>
         {% endfor %}
diff --git a/templates/navigation/menu--external-menu--mega-menu.html.twig b/templates/navigation/menu--external-menu--mega-menu.html.twig
index ebd5ed810..95f4ed54b 100644
--- a/templates/navigation/menu--external-menu--mega-menu.html.twig
+++ b/templates/navigation/menu--external-menu--mega-menu.html.twig
@@ -73,7 +73,7 @@
             {% endset %}
 
             {% if not item.is_nolink %}
-              {% spaceless %}
+              {% apply spaceless %}
 
                 {% set icon_name = (item.url.getOption('attributes')).icon %}
                 {% if icon_name %}
@@ -94,7 +94,7 @@
 
                 {{ link(item_title, item.url, link_attributes) }}
 
-              {% endspaceless %}
+              {% endapply %}
             {% else %}
               <span{{ create_attribute({'class': 'megamenu__item__nolink'} ) }}>{{ item.title }}</span>
             {% endif %}
diff --git a/templates/navigation/menu--mobile.html.twig b/templates/navigation/menu--mobile.html.twig
index 4c42c41ad..8740fb935 100644
--- a/templates/navigation/menu--mobile.html.twig
+++ b/templates/navigation/menu--mobile.html.twig
@@ -68,7 +68,7 @@
 
             {% set item_title = item.title %}
             {% if not item.is_nolink %}
-              {% spaceless %}
+              {% apply spaceless %}
 
                 {% set icon_name = (item.url.getOption('attributes')).icon %}
                 {% if icon_name %}
@@ -89,7 +89,7 @@
 
                 {{ link(item_title, item.url, link_attributes) }}
 
-              {% endspaceless %}
+              {% endapply %}
             {% else %}
               <span{{ create_attribute({'class': 'cssnav__item__nolink'} ) }}>{{ item.title }}</span>
             {% endif %}
diff --git a/templates/navigation/menu.html.twig b/templates/navigation/menu.html.twig
index de50e302f..d6c0b161a 100644
--- a/templates/navigation/menu.html.twig
+++ b/templates/navigation/menu.html.twig
@@ -74,7 +74,7 @@
       <li{{ item.attributes.removeAttribute('class', 'lang').addClass(item_classes) }}>
         <span class="menu__link-wrapper">
           {% if not item.is_nolink %}
-            {% spaceless %}
+            {% apply spaceless %}
 
               {% set item_title %}
                 {% set icon_name = (item.url.getOption('attributes')).icon %}
@@ -95,7 +95,7 @@
 
               {{ link(item_title, item.url, link_attributes) }}
 
-            {% endspaceless %}
+            {% endapply %}
           {% else %}
             <span{{ create_attribute({'class': item_classes|merge(['menu__nolink'])}) }}><span class="menu__link__text" id="{{ item_is_collabsible ? link_id }}"{{ item_lang }}>{{ item.title }}</span></span>
           {% endif %}