diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 943a8d4..75eadb7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [ '3.0', '3.1', '3.2', '3.3', 'head' ]
+        # TODO: we should test only supported versions: https://endoflife.date/ruby
+        ruby-version: [ '2.7', '3.0', '3.1', '3.2', '3.3', 'head' ]
 
     steps:
     - uses: actions/checkout@v3
diff --git a/.rubocop.yml b/.rubocop.yml
index 9f8c0a8..2626d82 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,23 +1,21 @@
 inherit_from: .rubocop_todo.yml
 
 require:
+  - standard
+  - standard-custom
+  - standard-performance
   - rubocop-performance
   - rubocop-rspec
   - rubocop-rake
-  - standard
 
 inherit_gem:
-  standard:
-    - config/base.yml
-    - config/ruby-2.5.yml
-    - config/ruby-2.6.yml
-    - config/ruby-2.7.yml
-    - config/ruby-3.0.yml
+  standard: config/ruby-3.0.yml
+  standard-custom: config/base.yml
+  standard-performance: config/base.yml
 
 AllCops:
-  # Last supported version before EOL
-  # See: https://endoflife.date/ruby
   TargetRubyVersion: 3.0
   NewCops: enable
   Exclude:
+    - '**/tmp/**/*'
     - '**/vendor/**/*'
diff --git a/Appraisals b/Appraisals
index 9cd36d9..4372820 100644
--- a/Appraisals
+++ b/Appraisals
@@ -15,3 +15,31 @@ end
 appraise "elasticsearch-8.9" do
   gem "elasticsearch", "~> 8.9.0"
 end
+
+appraise "elasticsearch-8.15" do
+  gem "elasticsearch", "~> 8.15.0"
+end
+
+# Supported versions of Rails:
+# https://endoflife.date/rails
+#
+if Gem::Version.new(RUBY_VERSION) <= Gem::Version.new("3.0")
+  appraise "rails-6.1" do
+    gem "activesupport", "~> 6.1.x"
+    gem "sqlite3", "~> 1.4.0"
+  end
+end
+
+appraise "rails-7.0" do
+  gem "activesupport", "~> 7.0.x"
+end
+
+if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.1")
+  appraise "rails-7.1" do
+    gem "activesupport", "~> 7.1.x"
+  end
+
+  appraise "rails-7.2" do
+    gem "activesupport", "~> 7.2.x"
+  end
+end
diff --git a/Gemfile b/Gemfile
index d9151c2..53b0876 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,9 @@ gemspec
 
 gem "gem-release"
 gem "simplecov_json_formatter"
-gem "sqlite3", "~> 1.4.0"
+
+if Gem::Version.new(RUBY_VERSION) < Gem::Version.new("3.1")
+  gem "activesupport", ">= 5.0", "< 7.1"
+  gem "activerecord", ">= 5.0", "< 7.1"
+  gem "sqlite3", "~> 1.4.0"
+end
diff --git a/caoutsearch.gemspec b/caoutsearch.gemspec
index a45a541..1e694da 100644
--- a/caoutsearch.gemspec
+++ b/caoutsearch.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.files = Dir["lib/**/*"] + %w[LICENSE README.md]
   s.require_paths = ["lib"]
 
-  s.add_dependency "activesupport", ">= 5.0"
+  s.add_dependency "activesupport", ">= 6.1"
   s.add_dependency "elasticsearch", "~> 8.x"
   s.add_dependency "hashie", "~> 5.0"
   s.add_dependency "multi_json", "~> 1.15"