diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ead84e164..3374907e76 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,10 +4,15 @@ All changes to Catstodon that aren't Mastodon or glitch-soc Mastodon changes wil
 
 All release dates, as well as most other dates, are intended to be read as "within the day, in UTC time."
 
+## [v4.3.3+cat+1.0.0] - 2025-01-16
+
+- Upstream changes, including security changes. See https://github.com/glitch-soc/mastodon/releases/tag/v4.3.3.
+
 ## [v4.3.2+cat.1.0.1] - 2025-01-04
 
 - The character counter is now always below the text field, not somewhere among the action buttons
-- The standalone share page now has the correct amount of remaining characters. Previously, it would assume a maximum character count of 500.
+- The standalone share page now has the correct amount of remaining characters. Previously, it would assume a maximum
+  character count of 500.
 - Emoji reaction patch changes (removal of old, obsolete migration)
 
 ## [v4.3.2+cat.1.0.0] - 2024-12-30
diff --git a/CHANGELOG_glitch.md b/CHANGELOG_glitch.md
index 02a12cfe5b..0b6d52c376 100644
--- a/CHANGELOG_glitch.md
+++ b/CHANGELOG_glitch.md
@@ -2,6 +2,24 @@
 
 All notable changes to this project will be documented in this file.
 
+## [4.3.3] - 2025-01-16
+
+### Security
+
+- Fix insufficient validation of account URIs ([GHSA-5wxh-3p65-r4g6](https://github.com/mastodon/mastodon/security/advisories/GHSA-5wxh-3p65-r4g6))
+- Update dependencies
+
+### Fixed
+
+- Fix `libyaml` missing from `Dockerfile` build stage (#33591 by @vmstan)
+- Fix incorrect notification settings migration for non-followers (#33348 by @ClearlyClaire)
+- Fix down clause for notification policy v2 migrations (#33340 by @jesseplusplus)
+- Fix error decrementing status count when `FeaturedTags#last_status_at` is `nil` (#33320 by @ClearlyClaire)
+- Fix last paginated notification group only including data on a single notification (#33271 by @ClearlyClaire)
+- Fix processing of mentions for post edits with an existing corresponding silent mention (#33227 by @ClearlyClaire)
+- Fix deletion of unconfirmed users with Webauthn set (#33186 by @ClearlyClaire)
+- Fix empty authors preview card serialization (#33151, #33466 by @mjankowski and @ClearlyClaire)
+
 ## [4.3.2] - 2024-12-03
 
 ### Added
@@ -135,7 +153,7 @@ The following changelog entries focus on changes visible to users, administrator
 - **Add notifications of severed relationships** (#27511, #29665, #29668, #29670, #29700, #29714, #29712, and #29731 by @ClearlyClaire and @Gargron)\
   Notify local users when they lose relationships as a result of a local moderator blocking a remote account or server, allowing the affected user to retrieve the list of broken relationships.\
   Note that this does not notify remote users.\
-  This adds the `severed_relationships` notification type to the REST API and streaming, with a new [`relationship_severance_event` attribute](https://docs.joinmastodon.org/entities/Notification/#relationship_severance_event).
+  This adds the `severed_relationships` notification type to the REST API and streaming, with a new [`event` attribute](https://docs.joinmastodon.org/entities/Notification/#relationship_severance_event).
 - **Add hover cards in web UI** (#30754, #30864, #30850, #30879, #30928, #30949, #30948, #30931, and #31300 by @ClearlyClaire, @Gargron, and @renchap)\
   Hovering over an avatar or username will now display a hover card with the first two lines of the user's description and their first two profile fields.\
   This can be disabled in the “Animations and accessibility” section of the preferences.
diff --git a/Dockerfile b/Dockerfile
index c7c02d9b46..8d50458132 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -150,6 +150,7 @@ RUN \
     libpq-dev \
     libssl-dev \
     libtool \
+    libyaml-dev \
     meson \
     nasm \
     pkg-config \
diff --git a/Gemfile.lock b/Gemfile.lock
index 0236bf3770..cd07706f93 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,35 +10,35 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.1.4.1)
-      actionpack (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    actioncable (7.1.5.1)
+      actionpack (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
       zeitwerk (~> 2.6)
-    actionmailbox (7.1.4.1)
-      actionpack (= 7.1.4.1)
-      activejob (= 7.1.4.1)
-      activerecord (= 7.1.4.1)
-      activestorage (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    actionmailbox (7.1.5.1)
+      actionpack (= 7.1.5.1)
+      activejob (= 7.1.5.1)
+      activerecord (= 7.1.5.1)
+      activestorage (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       mail (>= 2.7.1)
       net-imap
       net-pop
       net-smtp
-    actionmailer (7.1.4.1)
-      actionpack (= 7.1.4.1)
-      actionview (= 7.1.4.1)
-      activejob (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    actionmailer (7.1.5.1)
+      actionpack (= 7.1.5.1)
+      actionview (= 7.1.5.1)
+      activejob (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       mail (~> 2.5, >= 2.5.4)
       net-imap
       net-pop
       net-smtp
       rails-dom-testing (~> 2.2)
-    actionpack (7.1.4.1)
-      actionview (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    actionpack (7.1.5.1)
+      actionview (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       nokogiri (>= 1.8.5)
       racc
       rack (>= 2.2.4)
@@ -46,15 +46,15 @@ GEM
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    actiontext (7.1.4.1)
-      actionpack (= 7.1.4.1)
-      activerecord (= 7.1.4.1)
-      activestorage (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    actiontext (7.1.5.1)
+      actionpack (= 7.1.5.1)
+      activerecord (= 7.1.5.1)
+      activestorage (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.1.4.1)
-      activesupport (= 7.1.4.1)
+    actionview (7.1.5.1)
+      activesupport (= 7.1.5.1)
       builder (~> 3.1)
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
@@ -64,30 +64,33 @@ GEM
       activemodel (>= 4.1)
       case_transform (>= 0.2)
       jsonapi-renderer (>= 0.1.1.beta1, < 0.3)
-    activejob (7.1.4.1)
-      activesupport (= 7.1.4.1)
+    activejob (7.1.5.1)
+      activesupport (= 7.1.5.1)
       globalid (>= 0.3.6)
-    activemodel (7.1.4.1)
-      activesupport (= 7.1.4.1)
-    activerecord (7.1.4.1)
-      activemodel (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    activemodel (7.1.5.1)
+      activesupport (= 7.1.5.1)
+    activerecord (7.1.5.1)
+      activemodel (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       timeout (>= 0.4.0)
-    activestorage (7.1.4.1)
-      actionpack (= 7.1.4.1)
-      activejob (= 7.1.4.1)
-      activerecord (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    activestorage (7.1.5.1)
+      actionpack (= 7.1.5.1)
+      activejob (= 7.1.5.1)
+      activerecord (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       marcel (~> 1.0)
-    activesupport (7.1.4.1)
+    activesupport (7.1.5.1)
       base64
+      benchmark (>= 0.3)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
       minitest (>= 5.1)
       mutex_m
+      securerandom (>= 0.3)
       tzinfo (~> 2.0)
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
@@ -126,6 +129,7 @@ GEM
     base64 (0.2.0)
     bcp47_spec (0.2.1)
     bcrypt (3.1.20)
+    benchmark (0.4.0)
     better_errors (2.10.1)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
@@ -454,7 +458,7 @@ GEM
     net-smtp (0.5.0)
       net-protocol
     nio4r (2.7.3)
-    nokogiri (1.16.7)
+    nokogiri (1.16.8)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     oj (3.16.6)
@@ -638,20 +642,20 @@ GEM
     rackup (1.0.0)
       rack (< 3)
       webrick
-    rails (7.1.4.1)
-      actioncable (= 7.1.4.1)
-      actionmailbox (= 7.1.4.1)
-      actionmailer (= 7.1.4.1)
-      actionpack (= 7.1.4.1)
-      actiontext (= 7.1.4.1)
-      actionview (= 7.1.4.1)
-      activejob (= 7.1.4.1)
-      activemodel (= 7.1.4.1)
-      activerecord (= 7.1.4.1)
-      activestorage (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    rails (7.1.5.1)
+      actioncable (= 7.1.5.1)
+      actionmailbox (= 7.1.5.1)
+      actionmailer (= 7.1.5.1)
+      actionpack (= 7.1.5.1)
+      actiontext (= 7.1.5.1)
+      actionview (= 7.1.5.1)
+      activejob (= 7.1.5.1)
+      activemodel (= 7.1.5.1)
+      activerecord (= 7.1.5.1)
+      activestorage (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       bundler (>= 1.15.0)
-      railties (= 7.1.4.1)
+      railties (= 7.1.5.1)
     rails-controller-testing (1.0.5)
       actionpack (>= 5.0.1.rc1)
       actionview (>= 5.0.1.rc1)
@@ -660,15 +664,15 @@ GEM
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.6.0)
+    rails-html-sanitizer (1.6.2)
       loofah (~> 2.21)
-      nokogiri (~> 1.14)
+      nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
     rails-i18n (7.0.9)
       i18n (>= 0.7, < 2)
       railties (>= 6.0.0, < 8)
-    railties (7.1.4.1)
-      actionpack (= 7.1.4.1)
-      activesupport (= 7.1.4.1)
+    railties (7.1.5.1)
+      actionpack (= 7.1.5.1)
+      activesupport (= 7.1.5.1)
       irb
       rackup (>= 1.0.0)
       rake (>= 12.2)
@@ -781,6 +785,7 @@ GEM
     scenic (1.8.0)
       activerecord (>= 4.0.0)
       railties (>= 4.0.0)
+    securerandom (0.4.1)
     selenium-webdriver (4.25.0)
       base64 (~> 0.2)
       logger (~> 1.4)
diff --git a/app/controllers/api/v2/notifications_controller.rb b/app/controllers/api/v2/notifications_controller.rb
index c070c0e5e7..cc38b95114 100644
--- a/app/controllers/api/v2/notifications_controller.rb
+++ b/app/controllers/api/v2/notifications_controller.rb
@@ -80,10 +80,31 @@ class Api::V2::NotificationsController < Api::BaseController
     return [] if @notifications.empty?
 
     MastodonOTELTracer.in_span('Api::V2::NotificationsController#load_grouped_notifications') do
-      NotificationGroup.from_notifications(@notifications, pagination_range: (@notifications.last.id)..(@notifications.first.id), grouped_types: params[:grouped_types])
+      pagination_range = (@notifications.last.id)..@notifications.first.id
+
+      # If the page is incomplete, we know we are on the last page
+      if incomplete_page?
+        if paginating_up?
+          pagination_range = @notifications.last.id...(params[:max_id]&.to_i)
+        else
+          range_start = params[:since_id]&.to_i
+          range_start += 1 unless range_start.nil?
+          pagination_range = range_start..(@notifications.first.id)
+        end
+      end
+
+      NotificationGroup.from_notifications(@notifications, pagination_range: pagination_range, grouped_types: params[:grouped_types])
     end
   end
 
+  def incomplete_page?
+    @notifications.size < limit_param(DEFAULT_NOTIFICATIONS_LIMIT)
+  end
+
+  def paginating_up?
+    params[:min_id].present?
+  end
+
   def browserable_account_notifications
     current_account.notifications.without_suspended.browserable(
       types: Array(browserable_params[:types]),
diff --git a/app/lib/delivery_failure_tracker.rb b/app/lib/delivery_failure_tracker.rb
index 6ec339665c..eb9172f108 100644
--- a/app/lib/delivery_failure_tracker.rb
+++ b/app/lib/delivery_failure_tracker.rb
@@ -46,6 +46,8 @@ class DeliveryFailureTracker
       urls.reject do |url|
         host = Addressable::URI.parse(url).normalized_host
         unavailable_domains_map[host]
+      rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
+        true
       end
     end
 
diff --git a/app/models/featured_tag.rb b/app/models/featured_tag.rb
index 529056f9c6..dfc700649c 100644
--- a/app/models/featured_tag.rb
+++ b/app/models/featured_tag.rb
@@ -47,7 +47,7 @@ class FeaturedTag < ApplicationRecord
   def decrement(deleted_status)
     if statuses_count <= 1
       update(statuses_count: 0, last_status_at: nil)
-    elsif last_status_at > deleted_status.created_at
+    elsif last_status_at.present? && last_status_at > deleted_status.created_at
       update(statuses_count: statuses_count - 1)
     else
       # Fetching the latest status creation time can be expensive, so only perform it
diff --git a/app/models/notification_group.rb b/app/models/notification_group.rb
index b6aa4d309c..0201657f1b 100644
--- a/app/models/notification_group.rb
+++ b/app/models/notification_group.rb
@@ -63,21 +63,31 @@ class NotificationGroup < ActiveModelSerializers::Model
         binds = [
           account_id,
           SAMPLE_ACCOUNTS_SIZE,
-          pagination_range.begin,
-          pagination_range.end,
           ActiveRecord::Relation::QueryAttribute.new('group_keys', group_keys, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Array.new(ActiveModel::Type::String.new)),
+          pagination_range.begin || 0,
         ]
+        binds << pagination_range.end unless pagination_range.end.nil?
+
+        upper_bound_cond = begin
+          if pagination_range.end.nil?
+            ''
+          elsif pagination_range.exclude_end?
+            'AND id < $5'
+          else
+            'AND id <= $5'
+          end
+        end
 
         ActiveRecord::Base.connection.select_all(<<~SQL.squish, 'grouped_notifications', binds).cast_values.to_h { |k, *values| [k, values] }
           SELECT
             groups.group_key,
-            (SELECT id FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key AND id <= $4 ORDER BY id DESC LIMIT 1),
-            array(SELECT from_account_id FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key AND id <= $4 ORDER BY id DESC LIMIT $2),
-            (SELECT count(*) FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key AND id <= $4) AS notifications_count,
-            (SELECT id FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key AND id >= $3 ORDER BY id ASC LIMIT 1) AS min_id,
-            (SELECT created_at FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key AND id <= $4 ORDER BY id DESC LIMIT 1)
+            (SELECT id FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key #{upper_bound_cond} ORDER BY id DESC LIMIT 1),
+            array(SELECT from_account_id FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key #{upper_bound_cond} ORDER BY id DESC LIMIT $2),
+            (SELECT count(*) FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key #{upper_bound_cond}) AS notifications_count,
+            (SELECT id FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key AND id >= $4 ORDER BY id ASC LIMIT 1) AS min_id,
+            (SELECT created_at FROM notifications WHERE notifications.account_id = $1 AND notifications.group_key = groups.group_key #{upper_bound_cond} ORDER BY id DESC LIMIT 1)
           FROM
-            unnest($5::text[]) AS groups(group_key);
+            unnest($3::text[]) AS groups(group_key);
         SQL
       else
         binds = [
diff --git a/app/models/preview_card.rb b/app/models/preview_card.rb
index 7579178f83..56fe483635 100644
--- a/app/models/preview_card.rb
+++ b/app/models/preview_card.rb
@@ -134,7 +134,7 @@ class PreviewCard < ApplicationRecord
   end
 
   def authors
-    @authors ||= [PreviewCard::Author.new(self)]
+    @authors ||= Array(serialized_authors)
   end
 
   class Author < ActiveModelSerializers::Model
@@ -169,6 +169,13 @@ class PreviewCard < ApplicationRecord
 
   private
 
+  def serialized_authors
+    if author_name? || author_url? || author_account_id?
+      PreviewCard::Author
+        .new(self)
+    end
+  end
+
   def extract_dimensions
     file = image.queued_for_write[:original]
 
diff --git a/app/services/activitypub/process_account_service.rb b/app/services/activitypub/process_account_service.rb
index a7422b5d02..f9b7789aec 100644
--- a/app/services/activitypub/process_account_service.rb
+++ b/app/services/activitypub/process_account_service.rb
@@ -9,6 +9,8 @@ class ActivityPub::ProcessAccountService < BaseService
   SUBDOMAINS_RATELIMIT = 10
   DISCOVERIES_PER_REQUEST = 400
 
+  VALID_URI_SCHEMES = %w(http https).freeze
+
   # Should be called with confirmed valid JSON
   # and WebFinger-resolved username and domain
   def call(username, domain, json, options = {})
@@ -96,16 +98,28 @@ class ActivityPub::ProcessAccountService < BaseService
   end
 
   def set_immediate_protocol_attributes!
-    @account.inbox_url               = @json['inbox'] || ''
-    @account.outbox_url              = @json['outbox'] || ''
-    @account.shared_inbox_url        = (@json['endpoints'].is_a?(Hash) ? @json['endpoints']['sharedInbox'] : @json['sharedInbox']) || ''
-    @account.followers_url           = @json['followers'] || ''
+    @account.inbox_url               = valid_collection_uri(@json['inbox'])
+    @account.outbox_url              = valid_collection_uri(@json['outbox'])
+    @account.shared_inbox_url        = valid_collection_uri(@json['endpoints'].is_a?(Hash) ? @json['endpoints']['sharedInbox'] : @json['sharedInbox'])
+    @account.followers_url           = valid_collection_uri(@json['followers'])
     @account.url                     = url || @uri
     @account.uri                     = @uri
     @account.actor_type              = actor_type
     @account.created_at              = @json['published'] if @json['published'].present?
   end
 
+  def valid_collection_uri(uri)
+    uri = uri.first if uri.is_a?(Array)
+    uri = uri['id'] if uri.is_a?(Hash)
+    return '' unless uri.is_a?(String)
+
+    parsed_uri = Addressable::URI.parse(uri)
+
+    VALID_URI_SCHEMES.include?(parsed_uri.scheme) && parsed_uri.host.present? ? parsed_uri : ''
+  rescue Addressable::URI::InvalidURIError
+    ''
+  end
+
   def set_immediate_attributes!
     @account.featured_collection_url = @json['featured'] || ''
     @account.display_name            = @json['name'] || ''
@@ -268,10 +282,11 @@ class ActivityPub::ProcessAccountService < BaseService
   end
 
   def collection_info(type)
-    return [nil, nil] if @json[type].blank?
+    collection_uri = valid_collection_uri(@json[type])
+    return [nil, nil] if collection_uri.blank?
     return @collections[type] if @collections.key?(type)
 
-    collection = fetch_resource_without_id_validation(@json[type])
+    collection = fetch_resource_without_id_validation(collection_uri)
 
     total_items = collection.is_a?(Hash) && collection['totalItems'].present? && collection['totalItems'].is_a?(Numeric) ? collection['totalItems'] : nil
     has_first_page = collection.is_a?(Hash) && collection['first'].present?
diff --git a/app/services/activitypub/process_status_update_service.rb b/app/services/activitypub/process_status_update_service.rb
index e2b752227d..e68abe9728 100644
--- a/app/services/activitypub/process_status_update_service.rb
+++ b/app/services/activitypub/process_status_update_service.rb
@@ -188,40 +188,30 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
   end
 
   def update_mentions!
-    previous_mentions = @status.active_mentions.includes(:account).to_a
-    current_mentions  = []
     unresolved_mentions = []
 
-    @raw_mentions.each do |href|
+    currently_mentioned_account_ids = @raw_mentions.filter_map do |href|
       next if href.blank?
 
       account   = ActivityPub::TagManager.instance.uri_to_resource(href, Account)
       account ||= ActivityPub::FetchRemoteAccountService.new.call(href, request_id: @request_id)
 
-      next if account.nil?
-
-      mention   = previous_mentions.find { |x| x.account_id == account.id }
-      mention ||= account.mentions.new(status: @status)
-
-      current_mentions << mention
-    rescue Mastodon::UnexpectedResponseError, *Mastodon::HTTP_CONNECTION_ERRORS
+      account&.id
+    rescue Mastodon::UnexpectedResponseError, HTTP::TimeoutError, HTTP::ConnectionError, OpenSSL::SSL::SSLError
       # Since previous mentions are about already-known accounts,
       # they don't try to resolve again and won't fall into this case.
       # In other words, this failure case is only for new mentions and won't
       # affect `removed_mentions` so they can safely be retried asynchronously
       unresolved_mentions << href
+      nil
     end
 
-    current_mentions.each do |mention|
-      mention.save if mention.new_record?
-    end
+    @status.mentions.upsert_all(currently_mentioned_account_ids.map { |id| { account_id: id, silent: false } }, unique_by: %w(status_id account_id))
 
     # If previous mentions are no longer contained in the text, convert them
     # to silent mentions, since withdrawing access from someone who already
     # received a notification might be more confusing
-    removed_mentions = previous_mentions - current_mentions
-
-    Mention.where(id: removed_mentions.map(&:id)).update_all(silent: true) unless removed_mentions.empty?
+    @status.mentions.where.not(account_id: currently_mentioned_account_ids).update_all(silent: true)
 
     # Queue unresolved mentions for later
     unresolved_mentions.uniq.each do |uri|
diff --git a/app/services/process_mentions_service.rb b/app/services/process_mentions_service.rb
index 1c4c7805f1..06777bee95 100644
--- a/app/services/process_mentions_service.rb
+++ b/app/services/process_mentions_service.rb
@@ -13,7 +13,7 @@ class ProcessMentionsService < BaseService
 
     return unless @status.local?
 
-    @previous_mentions = @status.active_mentions.includes(:account).to_a
+    @previous_mentions = @status.mentions.includes(:account).to_a
     @current_mentions  = []
 
     Status.transaction do
@@ -57,6 +57,8 @@ class ProcessMentionsService < BaseService
       mention ||= @current_mentions.find  { |x| x.account_id == mentioned_account.id }
       mention ||= @status.mentions.new(account: mentioned_account)
 
+      mention.silent = false
+
       @current_mentions << mention
 
       "@#{mentioned_account.acct}"
@@ -78,7 +80,7 @@ class ProcessMentionsService < BaseService
     end
 
     @current_mentions.each do |mention|
-      mention.save if mention.new_record? && @save_records
+      mention.save if (mention.new_record? || mention.silent_changed?) && @save_records
     end
 
     # If previous mentions are no longer contained in the text, convert them
@@ -86,7 +88,7 @@ class ProcessMentionsService < BaseService
     # received a notification might be more confusing
     removed_mentions = @previous_mentions - @current_mentions
 
-    Mention.where(id: removed_mentions.map(&:id)).update_all(silent: true) unless removed_mentions.empty?
+    Mention.where(id: removed_mentions.map(&:id), silent: false).update_all(silent: true) unless removed_mentions.empty?
   end
 
   def mention_undeliverable?(mentioned_account)
diff --git a/app/workers/mention_resolve_worker.rb b/app/workers/mention_resolve_worker.rb
index 72dcd9633f..8c5938aeaf 100644
--- a/app/workers/mention_resolve_worker.rb
+++ b/app/workers/mention_resolve_worker.rb
@@ -16,7 +16,7 @@ class MentionResolveWorker
 
     return if account.nil?
 
-    status.mentions.create!(account: account, silent: false)
+    status.mentions.upsert({ account_id: account.id, silent: false }, unique_by: %w(status_id account_id))
   rescue ActiveRecord::RecordNotFound
     # Do nothing
   rescue Mastodon::UnexpectedResponseError => e
diff --git a/app/workers/scheduler/user_cleanup_scheduler.rb b/app/workers/scheduler/user_cleanup_scheduler.rb
index f755128332..03544e2e98 100644
--- a/app/workers/scheduler/user_cleanup_scheduler.rb
+++ b/app/workers/scheduler/user_cleanup_scheduler.rb
@@ -19,6 +19,7 @@ class Scheduler::UserCleanupScheduler
     User.unconfirmed.where(confirmation_sent_at: ..UNCONFIRMED_ACCOUNTS_MAX_AGE_DAYS.days.ago).find_in_batches do |batch|
       # We have to do it separately because of missing database constraints
       AccountModerationNote.where(target_account_id: batch.map(&:account_id)).delete_all
+      WebauthnCredential.where(user_id: batch.map(&:id)).delete_all
       Account.where(id: batch.map(&:account_id)).delete_all
       User.where(id: batch.map(&:id)).delete_all
     end
diff --git a/db/migrate/20240808124338_migrate_notifications_policy_v2.rb b/db/migrate/20240808124338_migrate_notifications_policy_v2.rb
index 2e0684826a..ed1642d6b8 100644
--- a/db/migrate/20240808124338_migrate_notifications_policy_v2.rb
+++ b/db/migrate/20240808124338_migrate_notifications_policy_v2.rb
@@ -9,7 +9,7 @@ class MigrateNotificationsPolicyV2 < ActiveRecord::Migration[7.1]
   def up
     NotificationPolicy.in_batches.update_all(<<~SQL.squish)
       for_not_following = CASE filter_not_following WHEN true THEN 1 ELSE 0 END,
-      for_not_followers = CASE filter_not_following WHEN true THEN 1 ELSE 0 END,
+      for_not_followers = CASE filter_not_followers WHEN true THEN 1 ELSE 0 END,
       for_new_accounts = CASE filter_new_accounts WHEN true THEN 1 ELSE 0 END,
       for_private_mentions = CASE filter_private_mentions WHEN true THEN 1 ELSE 0 END
     SQL
@@ -18,7 +18,7 @@ class MigrateNotificationsPolicyV2 < ActiveRecord::Migration[7.1]
   def down
     NotificationPolicy.in_batches.update_all(<<~SQL.squish)
       filter_not_following = CASE for_not_following WHEN 0 THEN false ELSE true END,
-      filter_not_following = CASE for_not_followers WHEN 0 THEN false ELSE true END,
+      filter_not_followers = CASE for_not_followers WHEN 0 THEN false ELSE true END,
       filter_new_accounts = CASE for_new_accounts WHEN 0 THEN false ELSE true END,
       filter_private_mentions = CASE for_private_mentions WHEN 0 THEN false ELSE true END
     SQL
diff --git a/db/post_migrate/20240808124339_post_deployment_migrate_notifications_policy_v2.rb b/db/post_migrate/20240808124339_post_deployment_migrate_notifications_policy_v2.rb
index eb0c909729..5daf646643 100644
--- a/db/post_migrate/20240808124339_post_deployment_migrate_notifications_policy_v2.rb
+++ b/db/post_migrate/20240808124339_post_deployment_migrate_notifications_policy_v2.rb
@@ -9,7 +9,7 @@ class PostDeploymentMigrateNotificationsPolicyV2 < ActiveRecord::Migration[7.1]
   def up
     NotificationPolicy.in_batches.update_all(<<~SQL.squish)
       for_not_following = CASE filter_not_following WHEN true THEN 1 ELSE 0 END,
-      for_not_followers = CASE filter_not_following WHEN true THEN 1 ELSE 0 END,
+      for_not_followers = CASE filter_not_followers WHEN true THEN 1 ELSE 0 END,
       for_new_accounts = CASE filter_new_accounts WHEN true THEN 1 ELSE 0 END,
       for_private_mentions = CASE filter_private_mentions WHEN true THEN 1 ELSE 0 END
     SQL
@@ -18,7 +18,7 @@ class PostDeploymentMigrateNotificationsPolicyV2 < ActiveRecord::Migration[7.1]
   def down
     NotificationPolicy.in_batches.update_all(<<~SQL.squish)
       filter_not_following = CASE for_not_following WHEN 0 THEN false ELSE true END,
-      filter_not_following = CASE for_not_followers WHEN 0 THEN false ELSE true END,
+      filter_not_followers = CASE for_not_followers WHEN 0 THEN false ELSE true END,
       filter_new_accounts = CASE for_new_accounts WHEN 0 THEN false ELSE true END,
       filter_private_mentions = CASE for_private_mentions WHEN 0 THEN false ELSE true END
     SQL
diff --git a/docker-compose.yml b/docker-compose.yml
index 6048129318..636d1b3a40 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -59,7 +59,7 @@ services:
   web:
     # You can uncomment the following line if you want to not use the prebuilt image, for example if you have local code changes
     # build: .
-    image: ghcr.io/mastodon/mastodon:v4.3.2
+    image: ghcr.io/mastodon/mastodon:v4.3.3
     restart: always
     env_file: .env.production
     command: bundle exec puma -C config/puma.rb
@@ -83,7 +83,7 @@ services:
     # build:
     #   dockerfile: ./streaming/Dockerfile
     #   context: .
-    image: ghcr.io/mastodon/mastodon-streaming:v4.3.2
+    image: ghcr.io/mastodon/mastodon-streaming:v4.3.3
     restart: always
     env_file: .env.production
     command: node ./streaming/index.js
@@ -101,7 +101,7 @@ services:
 
   sidekiq:
     build: .
-    image: ghcr.io/mastodon/mastodon:v4.3.2
+    image: ghcr.io/mastodon/mastodon:v4.3.3
     restart: always
     env_file: .env.production
     command: bundle exec sidekiq
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index 89f2f635ab..10d230ae3f 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -13,7 +13,7 @@ module Mastodon
     end
 
     def patch
-      2
+      3
     end
 
     def default_prerelease
@@ -25,7 +25,7 @@ module Mastodon
     end
 
     def catstodon_revision
-      '1.0.1'
+      '1.0.0'
     end
 
     def build_metadata
diff --git a/spec/lib/delivery_failure_tracker_spec.rb b/spec/lib/delivery_failure_tracker_spec.rb
index 5fc17df589..18aef49dac 100644
--- a/spec/lib/delivery_failure_tracker_spec.rb
+++ b/spec/lib/delivery_failure_tracker_spec.rb
@@ -42,8 +42,8 @@ RSpec.describe DeliveryFailureTracker do
       Fabricate(:unavailable_domain, domain: 'foo.bar')
     end
 
-    it 'removes URLs that are unavailable' do
-      results = described_class.without_unavailable(['http://example.com/good/inbox', 'http://foo.bar/unavailable/inbox'])
+    it 'removes URLs that are bogus or unavailable' do
+      results = described_class.without_unavailable(['http://example.com/good/inbox', 'http://foo.bar/unavailable/inbox', '{foo:'])
 
       expect(results).to include('http://example.com/good/inbox')
       expect(results).to_not include('http://foo.bar/unavailable/inbox')
diff --git a/spec/requests/api/v2/notifications_spec.rb b/spec/requests/api/v2/notifications_spec.rb
index ffa0a71c77..aa4a861557 100644
--- a/spec/requests/api/v2/notifications_spec.rb
+++ b/spec/requests/api/v2/notifications_spec.rb
@@ -143,6 +143,55 @@ RSpec.describe 'Notifications' do
       end
     end
 
+    context 'when there are numerous notifications for the same final group' do
+      before do
+        user.account.notifications.destroy_all
+        5.times.each { FavouriteService.new.call(Fabricate(:account), user.account.statuses.first) }
+      end
+
+      context 'with no options' do
+        it 'returns a notification group covering all notifications' do
+          subject
+
+          notification_ids = user.account.notifications.reload.pluck(:id)
+
+          expect(response).to have_http_status(200)
+          expect(response.content_type)
+            .to start_with('application/json')
+          expect(response.parsed_body[:notification_groups]).to contain_exactly(
+            a_hash_including(
+              type: 'favourite',
+              sample_account_ids: have_attributes(size: 5),
+              page_min_id: notification_ids.first.to_s,
+              page_max_id: notification_ids.last.to_s
+            )
+          )
+        end
+      end
+
+      context 'with min_id param' do
+        let(:params) { { min_id: user.account.notifications.reload.first.id - 1 } }
+
+        it 'returns a notification group covering all notifications' do
+          subject
+
+          notification_ids = user.account.notifications.reload.pluck(:id)
+
+          expect(response).to have_http_status(200)
+          expect(response.content_type)
+            .to start_with('application/json')
+          expect(response.parsed_body[:notification_groups]).to contain_exactly(
+            a_hash_including(
+              type: 'favourite',
+              sample_account_ids: have_attributes(size: 5),
+              page_min_id: notification_ids.first.to_s,
+              page_max_id: notification_ids.last.to_s
+            )
+          )
+        end
+      end
+    end
+
     context 'with no options' do
       it 'returns expected notification types', :aggregate_failures do
         subject
diff --git a/spec/serializers/rest/preview_card_serializer_spec.rb b/spec/serializers/rest/preview_card_serializer_spec.rb
new file mode 100644
index 0000000000..41ba305b7c
--- /dev/null
+++ b/spec/serializers/rest/preview_card_serializer_spec.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe REST::PreviewCardSerializer do
+  subject do
+    serialized_record_json(
+      preview_card,
+      described_class
+    )
+  end
+
+  context 'when preview card does not have author data' do
+    let(:preview_card) { Fabricate.build :preview_card }
+
+    it 'includes empty authors array' do
+      expect(subject.deep_symbolize_keys)
+        .to include(
+          authors: be_an(Array).and(be_empty)
+        )
+    end
+  end
+
+  context 'when preview card has fediverse author data' do
+    let(:preview_card) { Fabricate.build :preview_card, author_account: Fabricate(:account) }
+
+    it 'includes populated authors array' do
+      expect(subject.deep_symbolize_keys)
+        .to include(
+          authors: be_an(Array).and(
+            contain_exactly(
+              include(
+                account: be_present
+              )
+            )
+          )
+        )
+    end
+  end
+
+  context 'when preview card has non-fediverse author data' do
+    let(:preview_card) { Fabricate.build :preview_card, author_name: 'Name', author_url: 'https://host.example/123' }
+
+    it 'includes populated authors array' do
+      expect(subject.deep_symbolize_keys)
+        .to include(
+          authors: be_an(Array).and(
+            contain_exactly(
+              include(
+                name: 'Name',
+                url: 'https://host.example/123'
+              )
+            )
+          )
+        )
+    end
+  end
+end
diff --git a/spec/services/activitypub/process_status_update_service_spec.rb b/spec/services/activitypub/process_status_update_service_spec.rb
index b6ceba374f..ed6e8e3167 100644
--- a/spec/services/activitypub/process_status_update_service_spec.rb
+++ b/spec/services/activitypub/process_status_update_service_spec.rb
@@ -6,6 +6,7 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService do
   subject { described_class.new }
 
   let!(:status) { Fabricate(:status, text: 'Hello world', account: Fabricate(:account, domain: 'example.com')) }
+  let(:bogus_mention) { 'https://example.com/users/erroringuser' }
   let(:payload) do
     {
       '@context': 'https://www.w3.org/ns/activitystreams',
@@ -17,6 +18,7 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService do
       tag: [
         { type: 'Hashtag', name: 'hoge' },
         { type: 'Mention', href: ActivityPub::TagManager.instance.uri_for(alice) },
+        { type: 'Mention', href: bogus_mention },
       ],
     }
   end
@@ -30,19 +32,21 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService do
   let(:media_attachments) { [] }
 
   before do
-    mentions.each { |a| Fabricate(:mention, status: status, account: a) }
+    mentions.each { |(account, silent)| Fabricate(:mention, status: status, account: account, silent: silent) }
     tags.each { |t| status.tags << t }
     media_attachments.each { |m| status.media_attachments << m }
+    stub_request(:get, bogus_mention).to_raise(HTTP::ConnectionError)
   end
 
   describe '#call' do
-    it 'updates text and content warning' do
+    it 'updates text and content warning, and schedules re-fetching broken mention' do
       subject.call(status, json, json)
       expect(status.reload)
         .to have_attributes(
           text: eq('Hello universe'),
           spoiler_text: eq('Show more')
         )
+      expect(MentionResolveWorker).to have_enqueued_sidekiq_job(status.id, bogus_mention, anything)
     end
 
     context 'when the changes are only in sanitized-out HTML' do
@@ -276,7 +280,19 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService do
     end
 
     context 'when originally with mentions' do
-      let(:mentions) { [alice, bob] }
+      let(:mentions) { [[alice, false], [bob, false]] }
+
+      before do
+        subject.call(status, json, json)
+      end
+
+      it 'updates mentions' do
+        expect(status.active_mentions.reload.map(&:account_id)).to eq [alice.id]
+      end
+    end
+
+    context 'when originally with silent mentions' do
+      let(:mentions) { [[alice, true], [bob, true]] }
 
       before do
         subject.call(status, json, json)
diff --git a/spec/services/update_status_service_spec.rb b/spec/services/update_status_service_spec.rb
index 7c92adeffd..463605dd22 100644
--- a/spec/services/update_status_service_spec.rb
+++ b/spec/services/update_status_service_spec.rb
@@ -150,6 +150,14 @@ RSpec.describe UpdateStatusService do
         .to eq [bob.id]
       expect(status.mentions.pluck(:account_id))
         .to contain_exactly(alice.id, bob.id)
+
+      # Going back when a mention was switched to silence should still be possible
+      subject.call(status, status.account_id, text: 'Hello @alice')
+
+      expect(status.active_mentions.pluck(:account_id))
+        .to eq [alice.id]
+      expect(status.mentions.pluck(:account_id))
+        .to contain_exactly(alice.id, bob.id)
     end
   end
 
diff --git a/spec/workers/scheduler/user_cleanup_scheduler_spec.rb b/spec/workers/scheduler/user_cleanup_scheduler_spec.rb
index b1be7c4611..604f528586 100644
--- a/spec/workers/scheduler/user_cleanup_scheduler_spec.rb
+++ b/spec/workers/scheduler/user_cleanup_scheduler_spec.rb
@@ -9,6 +9,7 @@ RSpec.describe Scheduler::UserCleanupScheduler do
   let!(:old_unconfirmed_user) { Fabricate(:user) }
   let!(:confirmed_user)       { Fabricate(:user) }
   let!(:moderation_note)      { Fabricate(:account_moderation_note, account: Fabricate(:account), target_account: old_unconfirmed_user.account) }
+  let!(:webauthn_credential)  { Fabricate(:webauthn_credential, user_id: old_unconfirmed_user.id) }
 
   describe '#perform' do
     before do
@@ -26,6 +27,8 @@ RSpec.describe Scheduler::UserCleanupScheduler do
         .from(true).to(false)
       expect { moderation_note.reload }
         .to raise_error(ActiveRecord::RecordNotFound)
+      expect { webauthn_credential.reload }
+        .to raise_error(ActiveRecord::RecordNotFound)
       expect_preservation_of(new_unconfirmed_user)
       expect_preservation_of(confirmed_user)
     end