diff --git a/app/javascript/flavours/glitch/features/home_timeline/components/critical_update_banner.tsx b/app/javascript/flavours/glitch/features/home_timeline/components/critical_update_banner.tsx
new file mode 100644
index 0000000000..d0dd2b6acd
--- /dev/null
+++ b/app/javascript/flavours/glitch/features/home_timeline/components/critical_update_banner.tsx
@@ -0,0 +1,26 @@
+import { FormattedMessage } from 'react-intl';
+
+export const CriticalUpdateBanner = () => (
+  <div className='warning-banner'>
+    <div className='warning-banner__message'>
+      <h1>
+        <FormattedMessage
+          id='home.pending_critical_update.title'
+          defaultMessage='Critical security update available!'
+        />
+      </h1>
+      <p>
+        <FormattedMessage
+          id='home.pending_critical_update.body'
+          defaultMessage='Please update your Mastodon server as soon as possible!'
+        />{' '}
+        <a href='/admin/software_updates'>
+          <FormattedMessage
+            id='home.pending_critical_update.link'
+            defaultMessage='See updates'
+          />
+        </a>
+      </p>
+    </div>
+  </div>
+);
diff --git a/app/javascript/flavours/glitch/features/home_timeline/index.jsx b/app/javascript/flavours/glitch/features/home_timeline/index.jsx
index e17680d8bb..80dae5e4d0 100644
--- a/app/javascript/flavours/glitch/features/home_timeline/index.jsx
+++ b/app/javascript/flavours/glitch/features/home_timeline/index.jsx
@@ -14,7 +14,7 @@ import { fetchAnnouncements, toggleShowAnnouncements } from 'flavours/glitch/act
 import { IconWithBadge } from 'flavours/glitch/components/icon_with_badge';
 import { NotSignedInIndicator } from 'flavours/glitch/components/not_signed_in_indicator';
 import AnnouncementsContainer from 'flavours/glitch/features/getting_started/containers/announcements_container';
-import { me } from 'flavours/glitch/initial_state';
+import { me, criticalUpdatesPending } from 'flavours/glitch/initial_state';
 
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import { expandHomeTimeline } from '../../actions/timelines';
@@ -23,6 +23,7 @@ import ColumnHeader from '../../components/column_header';
 import StatusListContainer from '../ui/containers/status_list_container';
 
 import { ColumnSettings } from './components/column_settings';
+import { CriticalUpdateBanner } from './components/critical_update_banner';
 import { ExplorePrompt } from './components/explore_prompt';
 
 const messages = defineMessages({
@@ -158,8 +159,9 @@ class HomeTimeline extends PureComponent {
     const { intl, hasUnread, columnId, multiColumn, tooSlow, hasAnnouncements, unreadAnnouncements, showAnnouncements } = this.props;
     const pinned = !!columnId;
     const { signedIn } = this.context.identity;
+    const banners = [];
 
-    let announcementsButton, banner;
+    let announcementsButton;
 
     if (hasAnnouncements) {
       announcementsButton = (
@@ -174,8 +176,12 @@ class HomeTimeline extends PureComponent {
       );
     }
 
+    if (criticalUpdatesPending) {
+      banners.push(<CriticalUpdateBanner key='critical-update-banner' />);
+    }
+
     if (tooSlow) {
-      banner = <ExplorePrompt />;
+      banners.push(<ExplorePrompt key='explore-prompt' />);
     }
 
     return (
@@ -197,7 +203,7 @@ class HomeTimeline extends PureComponent {
 
         {signedIn ? (
           <StatusListContainer
-            prepend={banner}
+            prepend={banners}
             alwaysPrepend
             trackScroll={!pinned}
             scrollKey={`home_timeline-${columnId}`}
diff --git a/app/javascript/flavours/glitch/initial_state.js b/app/javascript/flavours/glitch/initial_state.js
index 46228c3306..8d277f8c18 100644
--- a/app/javascript/flavours/glitch/initial_state.js
+++ b/app/javascript/flavours/glitch/initial_state.js
@@ -100,6 +100,7 @@ export const hasMultiColumnPath = initialPath === '/'
  * @typedef InitialState
  * @property {Record<string, Account>} accounts
  * @property {InitialStateLanguage[]} languages
+ * @property {boolean=} critical_updates_pending
  * @property {InitialStateMeta} meta
  * @property {object} local_settings
  * @property {number} max_toot_chars
@@ -160,6 +161,7 @@ export const useBlurhash = getMeta('use_blurhash');
 export const usePendingItems = getMeta('use_pending_items');
 export const version = getMeta('version');
 export const languages = initialState?.languages;
+export const criticalUpdatesPending = initialState?.critical_updates_pending;
 export const statusPageUrl = getMeta('status_page_url');
 export const sso_redirect = getMeta('sso_redirect');
 
diff --git a/app/javascript/flavours/glitch/styles/admin.scss b/app/javascript/flavours/glitch/styles/admin.scss
index 7adeaeee01..2f4027b03f 100644
--- a/app/javascript/flavours/glitch/styles/admin.scss
+++ b/app/javascript/flavours/glitch/styles/admin.scss
@@ -143,6 +143,11 @@ $content-width: 840px;
         }
       }
 
+      .warning a {
+        color: $gold-star;
+        font-weight: 700;
+      }
+
       .simple-navigation-active-leaf a {
         color: $primary-text-color;
         background-color: $ui-highlight-color;
diff --git a/app/javascript/flavours/glitch/styles/components/columns.scss b/app/javascript/flavours/glitch/styles/components/columns.scss
index 6c97137964..39b9bd291d 100644
--- a/app/javascript/flavours/glitch/styles/components/columns.scss
+++ b/app/javascript/flavours/glitch/styles/components/columns.scss
@@ -977,7 +977,8 @@ $ui-header-height: 55px;
   }
 }
 
-.dismissable-banner {
+.dismissable-banner,
+.warning-banner {
   position: relative;
   margin: 10px;
   margin-bottom: 5px;
@@ -1055,6 +1056,21 @@ $ui-header-height: 55px;
   }
 }
 
+.warning-banner {
+  border: 1px solid $warning-red;
+  background: rgba($warning-red, 0.15);
+
+  &__message {
+    h1 {
+      color: $warning-red;
+    }
+
+    a {
+      color: $primary-text-color;
+    }
+  }
+}
+
 .hashtag-header {
   border-bottom: 1px solid lighten($ui-base-color, 8%);
   padding: 15px;
diff --git a/app/javascript/flavours/glitch/styles/tables.scss b/app/javascript/flavours/glitch/styles/tables.scss
index b583d3d8ea..44ef00ba73 100644
--- a/app/javascript/flavours/glitch/styles/tables.scss
+++ b/app/javascript/flavours/glitch/styles/tables.scss
@@ -12,6 +12,11 @@
     border-top: 1px solid $ui-base-color;
     text-align: start;
     background: darken($ui-base-color, 4%);
+
+    &.critical {
+      font-weight: 700;
+      color: $gold-star;
+    }
   }
 
   & > thead > tr > th {