diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 00000000..4e7020ea
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,76 @@
+---
+name: Tests
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+
+    services:
+      postgres:
+        image: "postgres:13"
+        ports: ["5432:5432"]
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: closure_tree
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - "3.2.5"
+        rails:
+          - activerecord_7.0
+        adapter:
+          - sqlite3
+          - mysql2
+          - postgresql
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+
+      - name: Set DB Adapter
+        env:
+          RAILS_VERSION: ${{ matrix.rails }}
+          DB_ADAPTER: ${{ matrix.adapter }}
+
+        # See: https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-README.md#mysql
+        run: |
+          if [ "${DB_ADAPTER}" = "mysql2" ]; then
+            sudo systemctl start mysql.service
+            mysql -u root -proot -e "create database closure_tree;"
+          fi
+
+      - name: Bundle
+        env:
+          RAILS_VERSION: ${{ matrix.rails }}
+          DB_ADAPTER: ${{ matrix.adapter }}
+          BUNDLE_GEMFILE: gemfiles/${{ matrix.rails }}.gemfile
+        run: |
+          gem install bundler
+          bundle config path vendor/bundle
+          bundle install --jobs 4 --retry 3
+
+      - name: RSpec
+        env:
+          RAILS_VERSION: ${{ matrix.rails }}
+          DB_ADAPTER: ${{ matrix.adapter }}
+          BUNDLE_GEMFILE: gemfiles/${{ matrix.rails }}.gemfile
+          WITH_ADVISORY_LOCK_PREFIX: ${{ github.run_id }}
+        run: bin/rake --trace spec:all
\ No newline at end of file
diff --git a/Appraisals b/Appraisals
index 98d02c51..a88f6246 100644
--- a/Appraisals
+++ b/Appraisals
@@ -89,6 +89,21 @@ appraise 'activerecord-6.1' do
   end
 end
 
+appraise 'activerecord-7.0' do
+  gem 'activerecord', '~> 7.0'
+  platforms :ruby do
+    gem 'mysql2'
+    gem 'pg'
+    gem 'sqlite3'
+  end
+
+  platforms :jruby do
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'activerecord-jdbcsqlite3-adapter'
+  end
+end
+
 appraise 'activerecord-edge' do
   gem 'activerecord', github: 'rails/rails'
   platforms :ruby do
diff --git a/Rakefile b/Rakefile
index 58751bf1..bb87ad7c 100644
--- a/Rakefile
+++ b/Rakefile
@@ -26,12 +26,3 @@ namespace :spec do
     task.pattern = 'spec/generators/*_spec.rb'
   end
 end
-
-require 'github_changelog_generator/task'
-GitHubChangelogGenerator::RakeTask.new :changelog do |config|
-  config.user = 'ClosureTree'
-  config.project = 'closure_tree'
-  config.issues = false
-  config.future_release = '5.2.0'
-  config.since_tag = 'v7.3.0'
-end
diff --git a/gemfiles/activerecord_7.0.gemfile b/gemfiles/activerecord_7.0.gemfile
new file mode 100644
index 00000000..f50ebabc
--- /dev/null
+++ b/gemfiles/activerecord_7.0.gemfile
@@ -0,0 +1,21 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "bump", "~> 0.10.0"
+gem "github_changelog_generator", "~> 1.16"
+gem "activerecord", "~> 7.0"
+
+platforms :ruby do
+  gem "mysql2"
+  gem "pg"
+  gem "sqlite3"
+end
+
+platforms :jruby do
+  gem "activerecord-jdbcmysql-adapter"
+  gem "activerecord-jdbcpostgresql-adapter"
+  gem "activerecord-jdbcsqlite3-adapter"
+end
+
+gemspec path: "../"
diff --git a/spec/support/models.rb b/spec/support/models.rb
index b9b45d7a..7c51aac1 100644
--- a/spec/support/models.rb
+++ b/spec/support/models.rb
@@ -78,7 +78,7 @@ class ContractType < ActiveRecord::Base
   has_many :contracts, inverse_of: :contract_type
 end
 
-class Block < ApplicationRecord
+class Block < ActiveRecord::Base
   acts_as_tree order: :column_whereby_ordering_is_inferred, # <- symbol, and not "sort_order"
                numeric_order: true,
                dependent: :destroy,
diff --git a/spec/support/schema.rb b/spec/support/schema.rb
index cf6a0331..5346a791 100644
--- a/spec/support/schema.rb
+++ b/spec/support/schema.rb
@@ -30,7 +30,7 @@
   add_foreign_key(:tag_hierarchies, :tags, :column => 'descendant_id')
 
   create_table "uuid_tags", :id => false do |t|
-    t.string "uuid", :unique => true
+    t.string "uuid"
     t.string "name"
     t.string "title"
     t.string "parent_uuid"
@@ -38,6 +38,8 @@
     t.timestamps null: false
   end
 
+  add_index "uuid_tags", :uuid, unique: true
+
   create_table "uuid_tag_hierarchies", :id => false do |t|
     t.string "ancestor_id", :null => false
     t.string "descendant_id", :null => false