diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 395a2a9..759f2da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,9 +8,7 @@ on:
   pull_request:
     branches:
       - master
-concurrency:
-  group: ci-${{ github.head_ref }}
-  cancel-in-progress: true
+
 
 jobs:
   rspec:
@@ -41,26 +39,15 @@ jobs:
       matrix:
         ruby:
           - '3.3'
-          - '3.2'
-          - '3.1'
-          - '3.0'
         rails:
+          - activerecord_8.0
           - activerecord_7.2
           - activerecord_7.1
-          - activerecord_7.0
-          - activerecord_6.1
           - activerecord_edge
         adapter:
           - 'sqlite3:///:memory:'
           - mysql2://root:root@0/closure_tree_test
           - postgres://closure_tree:closure_tree@0/closure_tree_test
-        exclude:
-          - ruby: '3.0'
-            rails: activerecord_edge
-          - ruby: '3.1'
-            rails: activerecord_edge
-          - ruby: '3.0'
-            rails: activerecord_7.2
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/ci_jruby.yml b/.github/workflows/ci_jruby.yml
index c7d0156..d0dec87 100644
--- a/.github/workflows/ci_jruby.yml
+++ b/.github/workflows/ci_jruby.yml
@@ -40,8 +40,7 @@ jobs:
       fail-fast: false
       matrix:
         rails:
-          - activerecord_7.0
-          - activerecord_6.1
+          - activerecord_7.1
         adapter:
           - 'sqlite3:///:memory:'
           - mysql2://root:root@0/closure_tree_test
diff --git a/.github/workflows/ci_truffleruby.yml b/.github/workflows/ci_truffleruby.yml
index b61630f..8429164 100644
--- a/.github/workflows/ci_truffleruby.yml
+++ b/.github/workflows/ci_truffleruby.yml
@@ -42,8 +42,7 @@ jobs:
         ruby:
           - truffleruby
         rails:
-          - activerecord_7.0
-          - activerecord_6.1
+          - activerecord_7.1
         adapter:
           - 'sqlite3:///:memory:'
           - mysql2://root:root@0/closure_tree_test
diff --git a/.tool-versions b/.tool-versions
index f2a971a..ca745c6 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1 +1 @@
-ruby 3.2.2
+ruby 3.4.4
diff --git a/Appraisals b/Appraisals
index ddb9be8..e9e8d95 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,23 +1,8 @@
 # frozen_string_literal: true
 
-appraise 'activerecord-6.1' do
-  gem 'activerecord', '~> 6.1.0'
-  platforms :ruby do
-    gem 'mysql2'
-    gem 'pg'
-    gem 'sqlite3', '< 2.0'
-  end
-
-  platforms :jruby do
-    gem 'activerecord-jdbcmysql-adapter'
-    gem 'activerecord-jdbcpostgresql-adapter'
-    gem 'activerecord-jdbcsqlite3-adapter'
-  end
-end
-
-appraise 'activerecord-7.0' do
-  gem 'activerecord', '~> 7.0.0'
-  platforms :ruby do
+appraise 'activerecord-7.1' do
+  gem 'activerecord', '~> 7.1.0'
+  platforms :ruby, :truffleruby do
     gem 'mysql2'
     gem 'pg'
     gem 'sqlite3', '< 2.0'
@@ -30,12 +15,12 @@ appraise 'activerecord-7.0' do
   end
 end
 
-appraise 'activerecord-7.1' do
-  gem 'activerecord', '~> 7.1.0'
+appraise 'activerecord-7.2' do
+  gem 'activerecord', '~> 7.2.0'
   platforms :ruby do
     gem 'mysql2'
     gem 'pg'
-    gem 'sqlite3', '< 2.0'
+    gem 'sqlite3'
   end
 
   platforms :jruby do
@@ -45,8 +30,8 @@ appraise 'activerecord-7.1' do
   end
 end
 
-appraise 'activerecord-7.2' do
-  gem 'activerecord', '~> 7.2.0'
+appraise 'activerecord-8.0' do
+  gem 'activerecord', '~> 8.0.0'
   platforms :ruby do
     gem 'mysql2'
     gem 'pg'
diff --git a/Gemfile b/Gemfile
index 4c07fb6..61f1b84 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,9 +4,3 @@ source 'https://rubygems.org'
 
 gemspec
 
-platform :mri do
-  group :development do
-    gem 'bump', '~> 0.10.0'
-    gem 'github_changelog_generator', '~> 1.16'
-  end
-end
diff --git a/README.md b/README.md
index a4ce159..2a562d1 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ closure_tree has some great features:
   * 2 SQL INSERTs on node creation
   * 3 SQL INSERT/UPDATEs on node reparenting
 * __Support for [concurrency](#concurrency)__ (using [with_advisory_lock](https://github.com/ClosureTree/with_advisory_lock))
-* __Tested against ActiveRecord 6.0+ with Ruby 2.7+__
+* __Tested against ActiveRecord 7.1+ with Ruby 3.3+__
 * Support for reparenting children (and all their descendants)
 * Support for [single-table inheritance (STI)](#sti) within the hierarchy
 * ```find_or_create_by_path``` for [building out heterogeneous hierarchies quickly and conveniently](#find_or_create_by_path)
@@ -52,7 +52,7 @@ for a description of different tree storage algorithms.
 
 ## Installation
 
-Note that closure_tree only supports ActiveRecord 6.0 and later, and has test coverage for MySQL, PostgreSQL, and SQLite.
+Note that closure_tree only supports ActiveRecord 7.1 and later, and has test coverage for MySQL, PostgreSQL, and SQLite.
 
 1.  Add `gem 'closure_tree'` to your Gemfile
 
@@ -662,8 +662,8 @@ end
 
 Closure tree is [tested under every valid combination](https://github.com/ClosureTree/closure_tree/blob/master/.github/workflows/ci.yml) of
 
-* Ruby 2.7+
-* ActiveRecord 6.0+
+* Ruby 3.3+
+* ActiveRecord 7.1+
 * PostgreSQL, MySQL, and SQLite. Concurrency tests are only run with MySQL and PostgreSQL.
 
 ```shell
diff --git a/Rakefile b/Rakefile
index e93b025..f9642db 100644
--- a/Rakefile
+++ b/Rakefile
@@ -29,14 +29,4 @@ Rake::TestTask.new do |t|
   t.verbose = true
 end
 
-if RUBY_ENGINE == 'ruby'
-  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 = 'v7.4.0'
-  end
-end
 task default: 'spec:all'
diff --git a/closure_tree.gemspec b/closure_tree.gemspec
index 8ddf51d..fdd2ffb 100644
--- a/closure_tree.gemspec
+++ b/closure_tree.gemspec
@@ -25,10 +25,10 @@ Gem::Specification.new do |gem|
   end
 
   gem.test_files  = gem.files.grep(%r{^spec/})
-  gem.required_ruby_version = '>= 3.0.0'
+  gem.required_ruby_version = '>= 3.3.0'
 
-  gem.add_runtime_dependency 'activerecord', '>= 6.1.0'
-  gem.add_runtime_dependency 'with_advisory_lock', '>= 5.0.0'
+  gem.add_runtime_dependency 'activerecord', '>= 7.1.0'
+  gem.add_runtime_dependency 'with_advisory_lock', '>= 5.0.0', '< 6.0.0'
 
   gem.add_development_dependency 'appraisal'
   gem.add_development_dependency 'database_cleaner'
diff --git a/gemfiles/activerecord_7.0.gemfile b/gemfiles/activerecord_7.0.gemfile
deleted file mode 100644
index 33e9a64..0000000
--- a/gemfiles/activerecord_7.0.gemfile
+++ /dev/null
@@ -1,26 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "activerecord", "~> 7.0.0"
-
-platforms :mri do
-  group :development do
-    gem "bump", "~> 0.10.0"
-    gem "github_changelog_generator", "~> 1.16"
-  end
-end
-
-platforms :ruby do
-  gem "mysql2"
-  gem "pg"
-  gem "sqlite3", "< 2.0"
-end
-
-platforms :jruby do
-  gem "activerecord-jdbcmysql-adapter"
-  gem "activerecord-jdbcpostgresql-adapter"
-  gem "activerecord-jdbcsqlite3-adapter"
-end
-
-gemspec path: "../"
diff --git a/gemfiles/activerecord_7.1.gemfile b/gemfiles/activerecord_7.1.gemfile
index 2d3953a..cd1ce6e 100644
--- a/gemfiles/activerecord_7.1.gemfile
+++ b/gemfiles/activerecord_7.1.gemfile
@@ -4,14 +4,7 @@ source "https://rubygems.org"
 
 gem "activerecord", "~> 7.1.0"
 
-platforms :mri do
-  group :development do
-    gem "bump", "~> 0.10.0"
-    gem "github_changelog_generator", "~> 1.16"
-  end
-end
-
-platforms :ruby do
+platforms :ruby, :truffleruby do
   gem "mysql2"
   gem "pg"
   gem "sqlite3", "< 2.0"
diff --git a/gemfiles/activerecord_7.2.gemfile b/gemfiles/activerecord_7.2.gemfile
index 8fe5958..8d8d9f0 100644
--- a/gemfiles/activerecord_7.2.gemfile
+++ b/gemfiles/activerecord_7.2.gemfile
@@ -4,13 +4,6 @@ source "https://rubygems.org"
 
 gem "activerecord", "~> 7.2.0"
 
-platforms :mri do
-  group :development do
-    gem "bump", "~> 0.10.0"
-    gem "github_changelog_generator", "~> 1.16"
-  end
-end
-
 platforms :ruby do
   gem "mysql2"
   gem "pg"
diff --git a/gemfiles/activerecord_6.1.gemfile b/gemfiles/activerecord_8.0.gemfile
similarity index 61%
rename from gemfiles/activerecord_6.1.gemfile
rename to gemfiles/activerecord_8.0.gemfile
index 4acb82a..64c0379 100644
--- a/gemfiles/activerecord_6.1.gemfile
+++ b/gemfiles/activerecord_8.0.gemfile
@@ -2,19 +2,12 @@
 
 source "https://rubygems.org"
 
-gem "activerecord", "~> 6.1.0"
-
-platforms :mri do
-  group :development do
-    gem "bump", "~> 0.10.0"
-    gem "github_changelog_generator", "~> 1.16"
-  end
-end
+gem "activerecord", "~> 8.0.0"
 
 platforms :ruby do
   gem "mysql2"
   gem "pg"
-  gem "sqlite3", "< 2.0"
+  gem "sqlite3"
 end
 
 platforms :jruby do
diff --git a/gemfiles/activerecord_edge.gemfile b/gemfiles/activerecord_edge.gemfile
index 2473814..2ba4cb7 100644
--- a/gemfiles/activerecord_edge.gemfile
+++ b/gemfiles/activerecord_edge.gemfile
@@ -4,13 +4,6 @@ source "https://rubygems.org"
 
 gem "activerecord", github: "rails/rails"
 
-platforms :mri do
-  group :development do
-    gem "bump", "~> 0.10.0"
-    gem "github_changelog_generator", "~> 1.16"
-  end
-end
-
 platforms :ruby do
   gem "mysql2"
   gem "pg"