diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd8af93..1c671d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,47 +10,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.2, 3.1, '3.0', 2.7, 2.6, ruby-head]
-        rails: ['7.0.0', '6.1.0', '6.0.0', '5.2.0', main]
+        ruby: [3.3, 3.2, 3.1, ruby-head]
+        rails: ['7.2.0', '7.1.0', '7.0.0', main]
         exclude:
           - ruby: ruby-head
-            rails: '6.1.0'
-          - ruby: ruby-head
-            rails: '6.0.0'
-          - ruby: ruby-head
-            rails: '5.2.0'
-          - ruby: 3.2
-            rails: '6.0.0'
-          - ruby: 3.2
-            rails: '5.2.0'
-          - ruby: 3.1
-            rails: '6.0.0'
+            rails: '7.0.0'
           - ruby: 3.1
-            rails: '5.2.0'
-          - ruby: 3.0
             rails: main
-          - ruby: 3.0
-            rails: '6.0.0'
-          - ruby: 3.0
-            rails: '5.2.0'
-          - ruby: 2.7
-            rails: main
-          - ruby: 2.7
-            rails: '5.2.0'
-          - ruby: 2.6
-            rails: main
-          - ruby: 2.6
-            rails: '7.0.0'
-          - ruby: 2.6
-            rails: '6.1.0'
-          - ruby: 2.6
-            rails: '6.0.0'
 
     env:
       RAILS_VERSION: ${{ matrix.rails }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby ${{ matrix.ruby }}
       uses: ruby/setup-ruby@v1
       with:
diff --git a/Gemfile b/Gemfile
index fe1f9bc..ac62360 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,16 +1,19 @@
 source 'https://rubygems.org'
 
 rails_version = ENV['RAILS_VERSION'] || "default"
+require_sqlite3_1x = %w[7.0.0].include?(rails_version)
+
 rails =
   case rails_version
   when 'main'
     { github: 'rails/rails' }
   when 'default'
-    '>= 5.0'
+    '>= 7.0'
   else
     "~> #{ENV['RAILS_VERSION']}"
   end
 
 gem 'rails', rails
+gem 'sqlite3', '~> 1.3' if require_sqlite3_1x
 
 gemspec
diff --git a/README.md b/README.md
index 376d036..0ec1ff8 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Rails integration for [jsonapi-rb](http://jsonapi-rb.org).
 ## Status
 
 [![Gem Version](https://badge.fury.io/rb/jsonapi-rails.svg)](https://badge.fury.io/rb/jsonapi-rails)
-[![Build Status](https://github.com/jsonapi-rb/jsonapi-rails/actions/workflows/ci.yml/badge.svg)](https://github.com/jsonapi-rb/jsonapi-rails/actions/workflows/ci.yml/badge.svg)
+[![Build Status](https://github.com/jsonapi-rb/jsonapi-rails/actions/workflows/ci.yml/badge.svg)](https://github.com/jsonapi-rb/jsonapi-rails/actions/workflows/ci.yml)
 [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.svg)](https://gitter.im/jsonapi-rb/Lobby)
 
 ## Resources
diff --git a/jsonapi-rails.gemspec b/jsonapi-rails.gemspec
index 24c4a45..95a510b 100644
--- a/jsonapi-rails.gemspec
+++ b/jsonapi-rails.gemspec
@@ -16,10 +16,12 @@ Gem::Specification.new do |spec|
   spec.files         = Dir['README.md', 'lib/**/*']
   spec.require_path  = 'lib'
 
+  spec.required_ruby_version = '>= 3.1.0'
+
   spec.add_dependency 'jsonapi-rb', '~> 0.5.0'
   spec.add_dependency 'jsonapi-parser', '~> 0.1.0'
 
-  spec.add_development_dependency 'rails', '>= 5.0'
+  spec.add_development_dependency 'rails', '>= 7.0'
   spec.add_development_dependency 'sqlite3', '>= 1.3'
   spec.add_development_dependency 'rake',        '>= 11.3'
   spec.add_development_dependency 'rspec-rails', '>= 4.0'
diff --git a/spec/dummy/config/initializers/new_framework_defaults.rb b/spec/dummy/config/initializers/new_framework_defaults.rb
index 69c499f..9359584 100644
--- a/spec/dummy/config/initializers/new_framework_defaults.rb
+++ b/spec/dummy/config/initializers/new_framework_defaults.rb
@@ -17,10 +17,5 @@
 # Require `belongs_to` associations by default. Previous versions had false.
 Rails.application.config.active_record.belongs_to_required_by_default = true
 
-# Do not halt callback chains when a callback returns false. Previous versions had true.
-if Rails.version < '5.2'
-  ActiveSupport.halt_callback_chains_on_return_false = false
-end
-
 # Configure SSL options to enable HSTS with subdomains. Previous versions had false.
 Rails.application.config.ssl_options = { hsts: { subdomains: true } }
diff --git a/spec/dummy/config/initializers/sqlite3_fix.rb b/spec/dummy/config/initializers/sqlite3_fix.rb
index 53f9423..a09345e 100644
--- a/spec/dummy/config/initializers/sqlite3_fix.rb
+++ b/spec/dummy/config/initializers/sqlite3_fix.rb
@@ -1,3 +1,3 @@
-if Rails.version >= '5.1.0' && Rails.application.config.active_record.sqlite3.present?
+if Rails.application.config.active_record.sqlite3.present?
   Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true
 end
diff --git a/spec/parsed_body_spec.rb b/spec/parsed_body_spec.rb
index 985d582..4ea968b 100644
--- a/spec/parsed_body_spec.rb
+++ b/spec/parsed_body_spec.rb
@@ -1,6 +1,6 @@
 require 'rails_helper'
 
-describe ActionController::Base, type: :controller, if: Rails.version >= '6.0' do
+describe ActionController::Base, type: :controller do
   controller do
     def index
       render jsonapi: nil
diff --git a/spec/render_jsonapi_spec.rb b/spec/render_jsonapi_spec.rb
index a02c10b..eb42a51 100644
--- a/spec/render_jsonapi_spec.rb
+++ b/spec/render_jsonapi_spec.rb
@@ -20,6 +20,8 @@ def index
 
   context 'when using a cache' do
     controller do
+      User = Struct.new(:id, :name, :dob)
+
       def serializer
         Class.new(JSONAPI::Serializable::Resource) do
           type 'users'
@@ -32,17 +34,17 @@ def jsonapi_cache_key(*)
       end
 
       def user
-        OpenStruct.new(id: 1, name: 'Johnny Cache', dob: Time.utc(2021,1,1))
+        User.new(1, 'Johnny Cache', Time.utc(2021,1,1))
       end
 
       def index
         render jsonapi: [user],
-               class: { OpenStruct: serializer }
+               class: { User: serializer }
       end
 
       def index_with_caching
         render jsonapi: [user],
-               class: { OpenStruct: serializer },
+               class: { User: serializer },
                cache: Rails.cache
       end
     end