diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 03ca12e..7f7241a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,23 +5,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7.8
-          rubygems: latest
-
-      - name: Cache gem dependencies
-        uses: actions/cache@v1
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-bundler-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: ${{ runner.os }}-bundler-
-
-      - name: Install dependencies
-        run: gem install bundler && bundle install --jobs 4 --retry 3 --path vendor/bundle
+          ruby-version: 3.2
+          bundler-cache: true
 
       - name: Run tests
         run: bundle exec rake test
diff --git a/Gemfile.lock b/Gemfile.lock
index d9df3cd..aa887a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,83 +1,138 @@
 GIT
   remote: https://github.com/basecamp/house-style.git
-  revision: b3ad65254828e8e8019a0d9a6205aff9ad206a77
+  revision: 6f73ca5c3fd5002b48aeede2d980f9b8fe047d55
   branch: main
   specs:
-    rubocop-37signals (1.0.0)
-      rubocop
-      rubocop-minitest
-      rubocop-performance
-      rubocop-rails
+    rubocop-37signals (1.2.1)
+      rubocop (>= 1.72)
+      rubocop-minitest (>= 0.37.0)
+      rubocop-performance (>= 1.24)
+      rubocop-rails (>= 2.30)
 
 PATH
   remote: .
   specs:
     rspamd-ruby (1.0.0)
+      activesupport (>= 6.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (7.0.7.2)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
+    activesupport (8.1.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
       i18n (>= 1.6, < 2)
+      json
+      logger (>= 1.4.2)
       minitest (>= 5.1)
-      tzinfo (~> 2.0)
-    addressable (2.8.1)
-      public_suffix (>= 2.0.2, < 6.0)
-    ast (2.4.2)
-    concurrent-ruby (1.2.2)
-    crack (0.4.3)
-      safe_yaml (~> 1.0.0)
-    debug (1.7.1)
-      irb (>= 1.5.0)
-      reline (>= 0.3.1)
-    hashdiff (1.0.0)
-    i18n (1.14.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
+    addressable (2.8.9)
+      public_suffix (>= 2.0.2, < 8.0)
+    ast (2.4.3)
+    base64 (0.3.0)
+    bigdecimal (4.0.1)
+    concurrent-ruby (1.3.6)
+    connection_pool (3.0.2)
+    crack (1.0.1)
+      bigdecimal
+      rexml
+    date (3.5.1)
+    debug (1.11.1)
+      irb (~> 1.10)
+      reline (>= 0.3.8)
+    drb (2.2.3)
+    erb (6.0.2)
+    hashdiff (1.2.1)
+    i18n (1.14.8)
       concurrent-ruby (~> 1.0)
-    io-console (0.6.0)
-    irb (1.6.2)
-      reline (>= 0.3.0)
-    json (2.6.3)
-    minitest (5.17.0)
-    parallel (1.22.1)
-    parser (3.2.1.0)
+    io-console (0.8.2)
+    irb (1.17.0)
+      pp (>= 0.6.0)
+      prism (>= 1.3.0)
+      rdoc (>= 4.0.0)
+      reline (>= 0.4.2)
+    json (2.18.1)
+    json-schema (6.1.0)
+      addressable (~> 2.8)
+      bigdecimal (>= 3.1, < 5)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
+    logger (1.7.0)
+    mcp (0.8.0)
+      json-schema (>= 4.1)
+    minitest (6.0.2)
+      drb (~> 2.0)
+      prism (~> 1.5)
+    parallel (1.27.0)
+    parser (3.3.10.2)
       ast (~> 2.4.1)
-    public_suffix (5.0.0)
-    rack (3.0.8)
+      racc
+    pp (0.6.3)
+      prettyprint
+    prettyprint (0.2.0)
+    prism (1.9.0)
+    psych (5.3.1)
+      date
+      stringio
+    public_suffix (7.0.5)
+    racc (1.8.1)
+    rack (3.2.5)
     rainbow (3.1.1)
-    rake (13.0.1)
-    regexp_parser (2.7.0)
-    reline (0.3.2)
+    rake (13.3.1)
+    rdoc (7.2.0)
+      erb
+      psych (>= 4.0.0)
+      tsort
+    regexp_parser (2.11.3)
+    reline (0.6.3)
       io-console (~> 0.5)
-    rexml (3.2.5)
-    rubocop (1.45.1)
+    rexml (3.4.4)
+    rubocop (1.85.1)
       json (~> 2.3)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
+      mcp (~> 0.6)
       parallel (~> 1.10)
-      parser (>= 3.2.0.0)
+      parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8, < 3.0)
-      rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.24.1, < 2.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.49.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.26.0)
-      parser (>= 3.2.1.0)
-    rubocop-minitest (0.27.0)
-      rubocop (>= 0.90, < 2.0)
-    rubocop-performance (1.16.0)
-      rubocop (>= 1.7.0, < 2.0)
-      rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.19.1)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.49.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.7)
+    rubocop-minitest (0.39.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.38.0, < 2.0)
+    rubocop-performance (1.26.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
+    rubocop-rails (2.34.3)
       activesupport (>= 4.2.0)
+      lint_roller (~> 1.1)
       rack (>= 1.1)
-      rubocop (>= 1.33.0, < 2.0)
-    ruby-progressbar (1.11.0)
-    safe_yaml (1.0.5)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.44.0, < 2.0)
+    ruby-progressbar (1.13.0)
+    securerandom (0.4.1)
+    stringio (3.2.0)
+    tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.4.2)
-    webmock (3.8.0)
-      addressable (>= 2.3.6)
+    unicode-display_width (3.2.0)
+      unicode-emoji (~> 4.1)
+    unicode-emoji (4.2.0)
+    uri (1.1.1)
+    webmock (3.26.1)
+      addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
 
diff --git a/lib/rspamd-ruby.rb b/lib/rspamd-ruby.rb
index 4617b9b..7787779 100644
--- a/lib/rspamd-ruby.rb
+++ b/lib/rspamd-ruby.rb
@@ -1,2 +1,37 @@
+require "active_support/core_ext/hash/keys"
 require "rspamd/client"
+require "rspamd/client_stub"
 require "rspamd/errors"
+require "rspamd/railtie" if defined?(::Rails::Railtie)
+
+module Rspamd
+  class << self
+    def setup(config)
+      @config = config.deep_symbolize_keys
+      @clients = {}
+    end
+
+    def client_for(name)
+      clients[name] ||= enabled? ? build_client(name) : ClientStub.new
+    end
+
+    def reset!
+      @config = nil
+      @clients = {}
+    end
+
+    private
+      def clients
+        @clients ||= {}
+      end
+
+      def enabled?
+        @config&.dig(:enabled)
+      end
+
+      def build_client(name)
+        settings = @config.fetch(name) { raise ArgumentError, "No rspamd configuration for #{name.inspect}" }
+        Client.new(**settings.slice(:host, :port, :password))
+      end
+  end
+end
diff --git a/lib/rspamd/client_stub.rb b/lib/rspamd/client_stub.rb
new file mode 100644
index 0000000..2eaa72c
--- /dev/null
+++ b/lib/rspamd/client_stub.rb
@@ -0,0 +1,39 @@
+require "rspamd/check/result"
+
+module Rspamd
+  class ClientStub
+    HAM_RESULT = Check::Result.new(
+      "score" => 0.0,
+      "required_score" => 15.0,
+      "action" => "no action",
+      "is_skipped" => false,
+      "symbols" => {},
+      "urls" => [],
+      "emails" => []
+    ).freeze
+
+    def ping
+      true
+    end
+
+    def check(message, headers: {})
+      HAM_RESULT
+    end
+
+    def spam!(message)
+      true
+    end
+
+    def ham!(message)
+      true
+    end
+
+    def add_fuzzy(message, flag: 1, weight: 1)
+      true
+    end
+
+    def delete_fuzzy(message, flag: 1)
+      true
+    end
+  end
+end
diff --git a/lib/rspamd/railtie.rb b/lib/rspamd/railtie.rb
new file mode 100644
index 0000000..f5b711e
--- /dev/null
+++ b/lib/rspamd/railtie.rb
@@ -0,0 +1,11 @@
+module Rspamd
+  class Railtie < ::Rails::Railtie
+    initializer "rspamd.setup" do
+      config_path = ::Rails.root.join("config/rspamd.yml")
+
+      if config_path.exist?
+        Rspamd.setup(::Rails.application.config_for(:rspamd))
+      end
+    end
+  end
+end
diff --git a/rspamd-ruby.gemspec b/rspamd-ruby.gemspec
index e7074f3..7512866 100644
--- a/rspamd-ruby.gemspec
+++ b/rspamd-ruby.gemspec
@@ -8,7 +8,9 @@ Gem::Specification.new do |s|
   s.summary  = "Client for Rspamd's HTTP API"
   s.homepage = "https://github.com/basecamp/rspamd-ruby"
 
-  s.required_ruby_version = ">= 2.7.8"
+  s.required_ruby_version = ">= 3.2"
+
+  s.add_dependency "activesupport", ">= 6.0"
 
   s.add_development_dependency "rake",     "~> 13.0"
   s.add_development_dependency "minitest", "> 5.11"
diff --git a/test/client_stub_test.rb b/test/client_stub_test.rb
new file mode 100644
index 0000000..e5dc8ef
--- /dev/null
+++ b/test/client_stub_test.rb
@@ -0,0 +1,46 @@
+require "test_helper"
+
+class Rspamd::ClientStubTest < Minitest::Test
+  def setup
+    @stub = Rspamd::ClientStub.new
+  end
+
+  def test_ping_returns_true
+    assert @stub.ping
+  end
+
+  def test_check_returns_ham_result
+    result = @stub.check("message body")
+    assert result.ham?
+    assert_not result.spam?
+    assert_equal 0.0, result.score
+    assert_equal 15.0, result.required_score
+    assert_equal "no action", result.action
+  end
+
+  def test_check_accepts_headers
+    result = @stub.check("message body", headers: { "Settings-Id" => "outbound" })
+    assert result.ham?
+  end
+
+  def test_spam_returns_true
+    assert @stub.spam!("message body")
+  end
+
+  def test_ham_returns_true
+    assert @stub.ham!("message body")
+  end
+
+  def test_add_fuzzy_returns_true
+    assert @stub.add_fuzzy("message body")
+  end
+
+  def test_delete_fuzzy_returns_true
+    assert @stub.delete_fuzzy("message body")
+  end
+
+  private
+    def assert_not(value)
+      assert !value
+    end
+end
diff --git a/test/setup_test.rb b/test/setup_test.rb
new file mode 100644
index 0000000..a47ec44
--- /dev/null
+++ b/test/setup_test.rb
@@ -0,0 +1,64 @@
+require "test_helper"
+
+class Rspamd::SetupTest < Minitest::Test
+  def teardown
+    Rspamd.reset!
+  end
+
+  def test_returns_stub_when_disabled
+    Rspamd.setup("enabled" => false, "outbound" => { "host" => "localhost", "port" => 11334 })
+
+    client = Rspamd.client_for(:outbound)
+    assert_instance_of Rspamd::ClientStub, client
+  end
+
+  def test_returns_client_when_enabled
+    Rspamd.setup("enabled" => true, "outbound" => { "host" => "rspamd.example.com", "port" => 11334 })
+
+    client = Rspamd.client_for(:outbound)
+    assert_instance_of Rspamd::Client, client
+  end
+
+  def test_caches_client_instances
+    Rspamd.setup("enabled" => true, "outbound" => { "host" => "localhost", "port" => 11334 })
+
+    client1 = Rspamd.client_for(:outbound)
+    client2 = Rspamd.client_for(:outbound)
+    assert_same client1, client2
+  end
+
+  def test_returns_stub_when_not_configured
+    client = Rspamd.client_for(:outbound)
+    assert_instance_of Rspamd::ClientStub, client
+  end
+
+  def test_raises_for_unknown_client_name
+    Rspamd.setup("enabled" => true, "outbound" => { "host" => "localhost", "port" => 11334 })
+
+    assert_raises(ArgumentError) { Rspamd.client_for(:nonexistent) }
+  end
+
+  def test_reset_clears_config_and_clients
+    Rspamd.setup("enabled" => true, "outbound" => { "host" => "localhost", "port" => 11334 })
+    Rspamd.client_for(:outbound)
+    Rspamd.reset!
+
+    # After reset, should return stub (no config = disabled)
+    client = Rspamd.client_for(:outbound)
+    assert_instance_of Rspamd::ClientStub, client
+  end
+
+  def test_accepts_symbol_keys
+    Rspamd.setup(enabled: true, outbound: { host: "localhost", port: 11334 })
+
+    client = Rspamd.client_for(:outbound)
+    assert_instance_of Rspamd::Client, client
+  end
+
+  def test_passes_password_to_client
+    Rspamd.setup("enabled" => true, "outbound" => { "host" => "localhost", "port" => 11334, "password" => "secret" })
+
+    client = Rspamd.client_for(:outbound)
+    assert_equal "secret", client.configuration.password
+  end
+end