diff --git a/app/javascript/styles/mastodon/tables.scss b/app/javascript/styles/mastodon/tables.scss
index ff2935a46a6..2e2d1bd41fe 100644
--- a/app/javascript/styles/mastodon/tables.scss
+++ b/app/javascript/styles/mastodon/tables.scss
@@ -15,10 +15,14 @@
     text-align: start;
     background: var(--color-bg-primary);
 
-    &.critical {
+    .critical {
       font-weight: 700;
       color: var(--color-text-warning);
     }
+
+    .unsupported {
+      color: var(--color-text-error);
+    }
   }
 
   .align-end {
diff --git a/app/models/software_update.rb b/app/models/software_update.rb
index 58b8342742b..2af760885ad 100644
--- a/app/models/software_update.rb
+++ b/app/models/software_update.rb
@@ -4,13 +4,14 @@
 #
 # Table name: software_updates
 #
-#  id            :bigint(8)        not null, primary key
-#  release_notes :string           default(""), not null
-#  type          :integer          default("patch"), not null
-#  urgent        :boolean          default(FALSE), not null
-#  version       :string           not null
-#  created_at    :datetime         not null
-#  updated_at    :datetime         not null
+#  id             :bigint(8)        not null, primary key
+#  end_of_support :date
+#  release_notes  :string           default(""), not null
+#  type           :integer          default("patch"), not null
+#  urgent         :boolean          default(FALSE), not null
+#  version        :string           not null
+#  created_at     :datetime         not null
+#  updated_at     :datetime         not null
 #
 
 class SoftwareUpdate < ApplicationRecord
@@ -32,6 +33,10 @@ class SoftwareUpdate < ApplicationRecord
     gem_version > runtime_version
   end
 
+  def unsupported?
+    end_of_support&.past?
+  end
+
   class << self
     def check_enabled?
       Rails.configuration.x.mastodon.software_update_url.present?
diff --git a/app/services/software_update_check_service.rb b/app/services/software_update_check_service.rb
index aa2eadd94c8..353a9a6c203 100644
--- a/app/services/software_update_check_service.rb
+++ b/app/services/software_update_check_service.rb
@@ -47,9 +47,11 @@ class SoftwareUpdateCheckService < BaseService
     new_update_notices = update_notices['updatesAvailable'].filter { |notice| known_versions.exclude?(notice['version']) }
     return if new_update_notices.blank?
 
-    new_updates = new_update_notices.map do |notice|
-      SoftwareUpdate.create!(version: notice['version'], urgent: notice['urgent'], type: notice['type'], release_notes: notice['releaseNotes'])
-    end
+    SoftwareUpdate.upsert_all(update_notices['updatesAvailable'].map do |notice|
+      { version: notice['version'], urgent: notice['urgent'], type: notice['type'], release_notes: notice['releaseNotes'], end_of_support: notice['endOfSupport']&.to_date }
+    end, unique_by: :version)
+
+    new_updates = SoftwareUpdate.where(version: new_update_notices.pluck('version')).to_a
 
     notify_devops!(new_updates)
   end
diff --git a/app/views/admin/software_updates/_software_update.html.haml b/app/views/admin/software_updates/_software_update.html.haml
index 9eb270e4974..98578d9125a 100644
--- a/app/views/admin/software_updates/_software_update.html.haml
+++ b/app/views/admin/software_updates/_software_update.html.haml
@@ -1,9 +1,14 @@
 %tr{ id: dom_id(software_update) }
   %td= software_update.version
   %td= t("admin.software_updates.types.#{software_update.type}")
-  %td{ class: class_names(critical: software_update.urgent?) }
+  %td
     - if software_update.urgent?
-      = t('admin.software_updates.critical_update')
+      .critical= t('admin.software_updates.critical_update')
+    - if software_update.end_of_support.present?
+      - if software_update.unsupported?
+        .unsupported= t('admin.software_updates.unsupported_since', date: software_update.end_of_support)
+      - else
+        %div= t('admin.software_updates.supported_until', date: software_update.end_of_support)
   %td.release-notes
     = table_link_to 'link',
                     t('admin.software_updates.release_notes'),
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 09ce9d210a7..410e54980a3 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1014,12 +1014,14 @@ en:
       description: It is recommended to keep your Mastodon installation up to date to benefit from the latest fixes and features. Moreover, it is sometimes critical to update Mastodon in a timely manner to avoid security issues. For these reasons, Mastodon checks for updates every 30 minutes, and will notify you according to your email notification preferences.
       documentation_link: Learn more
       release_notes: Release notes
+      supported_until: Support ends on %{date}
       title: Available updates
       type: Type
       types:
         major: Major release
         minor: Minor release
         patch: Patch release — bugfixes and easy to apply changes
+      unsupported_since: Unsupported since %{date}
       version: Version
     statuses:
       account: Author
diff --git a/db/migrate/20260706122112_add_end_of_support_to_software_updates.rb b/db/migrate/20260706122112_add_end_of_support_to_software_updates.rb
new file mode 100644
index 00000000000..451e4f91fef
--- /dev/null
+++ b/db/migrate/20260706122112_add_end_of_support_to_software_updates.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddEndOfSupportToSoftwareUpdates < ActiveRecord::Migration[8.1]
+  def change
+    add_column :software_updates, :end_of_support, :date
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 6a753c72f9f..1b24c81b3fe 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_07_02_144128) do
+ActiveRecord::Schema[8.1].define(version: 2026_07_06_122112) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -1159,6 +1159,7 @@ ActiveRecord::Schema[8.1].define(version: 2026_07_02_144128) do
 
   create_table "software_updates", force: :cascade do |t|
     t.datetime "created_at", null: false
+    t.date "end_of_support"
     t.string "release_notes", default: "", null: false
     t.integer "type", default: 0, null: false
     t.datetime "updated_at", null: false
diff --git a/spec/services/software_update_check_service_spec.rb b/spec/services/software_update_check_service_spec.rb
index 581e494ada5..ea72c52734a 100644
--- a/spec/services/software_update_check_service_spec.rb
+++ b/spec/services/software_update_check_service_spec.rb
@@ -68,18 +68,23 @@ RSpec.describe SoftwareUpdateCheckService do
     context 'when the server returns new versions' do
       let(:server_json) do
         {
+          currentVersion: {
+            endOfSupport: nil,
+          },
           updatesAvailable: [
             {
               version: '4.2.1',
               urgent: false,
               type: 'patch',
               releaseNotes: 'https://github.com/mastodon/mastodon/releases/v4.2.1',
+              endOfSupport: '2026-01-08',
             },
             {
               version: '4.3.0',
               urgent: false,
               type: 'minor',
               releaseNotes: 'https://github.com/mastodon/mastodon/releases/v4.3.0',
+              endOfSupport: '2026-05-06',
             },
             {
               version: '5.0.0',
@@ -111,6 +116,9 @@ RSpec.describe SoftwareUpdateCheckService do
       context 'when an update is urgent' do
         let(:server_json) do
           {
+            currentVersion: {
+              endOfSupport: nil,
+            },
             updatesAvailable: [
               {
                 version: '5.0.0',