diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3332c5a7f..d3602e398 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ New entries in this file should aim to provide a meaningful amount of informatio
 - Bump rubocop from 1.44.1 to 1.56.3 [PR#3207](https://github.com/ualbertalib/jupiter/pull/3207)
 - Bump rubocop-rails from 2.20.2 to 2.21.0 [PR#3211](https://github.com/ualbertalib/jupiter/pull/3211)
 - Bump Sidekiq and Sidekiq gems to latest version [PR#3217](https://github.com/ualbertalib/jupiter/pull/3217)
+- Bump ransack from 3.2.1 to 4.0.0 [PR#3235](https://github.com/ualbertalib/jupiter/pull/3235)
 
 ## [2.5.2] - 2023-08-16
 
diff --git a/Gemfile b/Gemfile
index 3f11e0cc4..fe048d0f5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,7 +58,7 @@ gem 'flipper-ui', '~> 1.0.0' # UI for feature flags
 gem 'jbuilder' # generate JSON objects
 gem 'kaminari' # Pagination
 gem 'paper_trail' # Track object changes
-gem 'ransack', '3.2.1' # ActiveRecord search/filter
+gem 'ransack', '4.0.0' # ActiveRecord search/filter
 gem 'redcarpet', '~> 3.6', require: ['redcarpet', 'redcarpet/render_strip'] # Markdown to (X)HTML parser
 gem 'uuidtools'
 gem 'voight_kampff', '~> 2.0', require: 'voight_kampff/rails' # bot detection
diff --git a/Gemfile.lock b/Gemfile.lock
index a9c259e21..e0b75fee3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -438,7 +438,7 @@ GEM
       thor (~> 1.0)
     rainbow (3.1.1)
     rake (13.0.6)
-    ransack (3.2.1)
+    ransack (4.0.0)
       activerecord (>= 6.1.5)
       activesupport (>= 6.1.5)
       i18n
@@ -673,7 +673,7 @@ DEPENDENCIES
   puma (~> 6.4)
   pundit (= 1.1.0)
   rails (~> 6.1.7)
-  ransack (= 3.2.1)
+  ransack (= 4.0.0)
   rdf (~> 3.2.9)
   rdf-isomorphic (~> 3.2.1)
   rdf-n3 (~> 3.2.1)
diff --git a/app/models/announcement.rb b/app/models/announcement.rb
index 0d23768c1..5c054c425 100644
--- a/app/models/announcement.rb
+++ b/app/models/announcement.rb
@@ -7,4 +7,12 @@ class Announcement < ApplicationRecord
   scope :current, -> { where(removed_at: nil).order(created_at: :desc) }
   scope :past, -> { where.not(removed_at: nil).order(removed_at: :desc) }
 
+  def self.ransackable_attributes(_auth_object = nil)
+    ['message', 'created_at', 'removed_at']
+  end
+
+  def self.ransackable_associations(_auth_object = nil)
+    ['user']
+  end
+
 end
diff --git a/app/models/batch_ingest.rb b/app/models/batch_ingest.rb
index c520ef749..5bdd5027c 100644
--- a/app/models/batch_ingest.rb
+++ b/app/models/batch_ingest.rb
@@ -16,4 +16,12 @@ class BatchIngest < ApplicationRecord
   validates :batch_ingest_files, presence: true, length: { maximum: 50 }
   validates :title, presence: true, uniqueness: { case_sensitive: false }
 
+  def self.ransackable_attributes(_auth_object = nil)
+    ['created_at', 'status', 'title']
+  end
+
+  def self.ransackable_associations(_auth_object = nil)
+    []
+  end
+
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index e0f528b57..b5c43815d 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -70,4 +70,12 @@ def flipper_id
     "User:#{id}"
   end
 
+  def self.ransackable_attributes(_auth_object = nil)
+    ['admin', 'created_at', 'email', 'last_seen_at', 'name', 'suspended']
+  end
+
+  def self.ransackable_associations(_auth_object = nil)
+    []
+  end
+
 end
diff --git a/app/views/admin/announcements/_past_announcements.html.erb b/app/views/admin/announcements/_past_announcements.html.erb
index 7048fbb86..aec089609 100644
--- a/app/views/admin/announcements/_past_announcements.html.erb
+++ b/app/views/admin/announcements/_past_announcements.html.erb
@@ -3,7 +3,7 @@
     <tr>
       <th><%= sort_link(@search, :message, t('.messsage')) %></th>
       <th><%= sort_link(@search, :user_name, t('.creator')) %></th>
-      <th><%= sort_link(@search, :posted_at, t('.posted_at')) %></th>
+      <th><%= sort_link(@search, :created_at, t('.posted_at')) %></th>
       <th><%= sort_link(@search, :removed_at, t('.removed_at')) %></th>
     </tr>
   </thead>