diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c5ea9a1..2b0fcad 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,6 +23,8 @@ jobs:
         include:
           - ruby-version: '3.0'
             gemfile: gemfiles/rails_6.x_active_admin_2.x.gemfile
+          - ruby-version: '3.0'
+            gemfile: gemfiles/rails_6.x_active_admin_3.x.gemfile
 
     env:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
diff --git a/Appraisals b/Appraisals
index 16ac6de..a4df4a4 100644
--- a/Appraisals
+++ b/Appraisals
@@ -16,4 +16,9 @@ end
 appraise 'rails-6.x-active-admin-2.x' do
   gem 'rails', '~> 6.1'
   gem 'activeadmin', '~> 2.0'
-end
\ No newline at end of file
+end
+
+appraise 'rails-6.x-active-admin-3.x' do
+  gem 'rails', '~> 6.1'
+  gem 'activeadmin', '~> 3.0'
+end
diff --git a/activeadmin-searchable_select.gemspec b/activeadmin-searchable_select.gemspec
index c3a3f61..66b28c4 100644
--- a/activeadmin-searchable_select.gemspec
+++ b/activeadmin-searchable_select.gemspec
@@ -35,7 +35,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'semmy', '~> 1.0'
   spec.add_development_dependency 'sprockets', '~> 3.7'
 
-  spec.add_runtime_dependency 'activeadmin', ['>= 1.x', '< 3']
+  spec.add_runtime_dependency 'activeadmin', ['>= 1.x', '< 4']
   spec.add_runtime_dependency 'jquery-rails', ['>= 3.0', '< 5']
   spec.add_runtime_dependency 'select2-rails', '~> 4.0'
 end
diff --git a/gemfiles/rails_6.x_active_admin_3.x.gemfile b/gemfiles/rails_6.x_active_admin_3.x.gemfile
new file mode 100644
index 0000000..b86b845
--- /dev/null
+++ b/gemfiles/rails_6.x_active_admin_3.x.gemfile
@@ -0,0 +1,9 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "sass-rails"
+gem "rails", "~> 6.1"
+gem "activeadmin", "~> 3.0"
+
+gemspec path: "../"
diff --git a/spec/support/models.rb b/spec/support/models.rb
index cd1414e..8bf5d8e 100644
--- a/spec/support/models.rb
+++ b/spec/support/models.rb
@@ -4,6 +4,10 @@ class User < ActiveRecord::Base; end
 
 class Category < ActiveRecord::Base
   belongs_to :created_by, class_name: 'User'
+
+  def self.ransackable_attributes(_auth_object = nil)
+    ['name']
+  end
 end
 
 class Post < ActiveRecord::Base
@@ -11,6 +15,10 @@ class Post < ActiveRecord::Base
   belongs_to :user
 
   scope(:published, -> { where(published: true) })
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w(category_id title)
+  end
 end
 
 module RGB
@@ -24,6 +32,10 @@ module Internal
   class TagName < ActiveRecord::Base
     self.table_name = :internal_tag_names
     belongs_to :color, class_name: 'RGB::Color', foreign_key: :color_id
+
+    def self.ransackable_attributes(_auth_object = nil)
+      ['color_id']
+    end
   end
 end
 
@@ -31,6 +43,10 @@ class OptionType < ActiveRecord::Base; end
 
 class OptionValue < ActiveRecord::Base
   belongs_to :option_type
+
+  def self.ransackable_attributes(_auth_object = nil)
+    ['value']
+  end
 end
 
 class Product < ActiveRecord::Base