diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 81b99e10..c9550555 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,11 +9,16 @@ permissions:
 
 jobs:
   test:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        ruby_version: ['3.1', '3.0', '2.7']
-        rails_version: ['6.0.x', '6.1.x', '7.0.x', 'edge']
+        ruby_version: ['3.4', '3.3', '3.2', '3.1']
+        rails_version: ['7.0.x', '7.1.x', '7.2.x', '8.0.x', 'edge']
+        exclude:
+          - ruby_version: '3.1'
+            rails_version: '8.0.x'
+          - ruby_version: '3.1'
+            rails_version: 'edge'
     name: Ruby ${{ matrix.ruby_version }} on Rails ${{ matrix.rails_version }}
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/Gemfile-rails.${{ matrix.rails_version }}
@@ -22,7 +27,7 @@ jobs:
       run: |
         sudo apt-get update -qq
         sudo apt-get install -qq graphviz
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby_version }}
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index ed2c60cd..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,56 +0,0 @@
-language: ruby
-rvm:
-  - 2.2
-  - 2.3
-  - 2.4
-  - 2.5
-  - 2.6
-  - 2.7
-  - 3.0
-  - 3.1
-  - jruby
-gemfile:
-  - gemfiles/Gemfile-rails.4.2.x
-  - gemfiles/Gemfile-rails.5.0.x
-  - gemfiles/Gemfile-rails.5.1.x
-  - gemfiles/Gemfile-rails.5.2.x
-  - gemfiles/Gemfile-rails.6.0.x
-  - gemfiles/Gemfile-rails.6.1.x
-  - gemfiles/Gemfile-rails.7.0.x
-  - gemfiles/Gemfile-rails.edge
-before_install:
-  - gem install bundler -v '< 2'
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq graphviz
-script: bundle exec rake
-matrix:
-  allow_failures:
-    - rvm: jruby
-    - gemfile: gemfiles/Gemfile-rails.edge
-  fast_finish: true
-  exclude:
-    - rvm: 2.2
-      gemfile: gemfiles/Gemfile-rails.6.0.x
-    - rvm: 2.2
-      gemfile: gemfiles/Gemfile-rails.6.1.x
-    - rvm: 2.2
-      gemfile: gemfiles/Gemfile-rails.7.0.x
-    - rvm: 2.2
-      gemfile: gemfiles/Gemfile-rails.edge
-    - rvm: 2.3
-      gemfile: gemfiles/Gemfile-rails.6.0.x
-    - rvm: 2.3
-      gemfile: gemfiles/Gemfile-rails.6.1.x
-    - rvm: 2.3
-      gemfile: gemfiles/Gemfile-rails.7.0.x
-    - rvm: 2.3
-      gemfile: gemfiles/Gemfile-rails.edge
-    - rvm: 2.4
-      gemfile: gemfiles/Gemfile-rails.6.0.x
-    - rvm: 2.4
-      gemfile: gemfiles/Gemfile-rails.6.1.x
-    - rvm: 2.4
-      gemfile: gemfiles/Gemfile-rails.7.0.x
-    - rvm: 2.4
-      gemfile: gemfiles/Gemfile-rails.edge
-cache: bundler
diff --git a/README.md b/README.md
index afa4bafc..42a2ec3f 100644
--- a/README.md
+++ b/README.md
@@ -22,8 +22,8 @@ Browse the [gallery](https://voormedia.github.io/rails-erd/gallery.html) for mor
 Requirements
 ---------------
 
-* Ruby 1.9.3+
-* ActiveRecord 3.x - 5.0.x
+* Ruby 2.2+
+* ActiveRecord 4.2+
 
 Getting started
 ---------------
diff --git a/gemfiles/Gemfile-rails.4.2.x b/gemfiles/Gemfile-rails.4.2.x
deleted file mode 100644
index 6c0bb7b7..00000000
--- a/gemfiles/Gemfile-rails.4.2.x
+++ /dev/null
@@ -1,22 +0,0 @@
-source "http://rubygems.org"
-
-gemspec :path => ".."
-
-gem "activerecord", "~> 4.2.0"
-
-group :development do
-  gem 'minitest', '5.10.1'
-  gem 'mocha'
-  gem "rake"
-  gem "yard"
-
-  platforms :ruby do
-    gem "sqlite3", '~> 1.3.13'
-    gem "redcarpet"
-  end
-
-  platforms :jruby do
-    gem "activerecord-jdbcsqlite3-adapter"
-    gem "jruby-openssl", :require => false # Silence openssl warnings.
-  end
-end
diff --git a/gemfiles/Gemfile-rails.5.0.x b/gemfiles/Gemfile-rails.5.0.x
deleted file mode 100644
index fa75b47c..00000000
--- a/gemfiles/Gemfile-rails.5.0.x
+++ /dev/null
@@ -1,22 +0,0 @@
-source "http://rubygems.org"
-
-gemspec :path => ".."
-
-gem "activerecord", "~> 5.0.2"
-
-group :development do
-  gem 'minitest', '5.10.1'
-  gem 'mocha'
-  gem "rake"
-  gem "yard"
-
-  platforms :ruby do
-    gem "sqlite3", '~> 1.3.13'
-    gem "redcarpet"
-  end
-
-  platforms :jruby do
-    gem "activerecord-jdbcsqlite3-adapter"
-    gem "jruby-openssl", :require => false # Silence openssl warnings.
-  end
-end
diff --git a/gemfiles/Gemfile-rails.5.1.x b/gemfiles/Gemfile-rails.5.1.x
deleted file mode 100644
index b49f845b..00000000
--- a/gemfiles/Gemfile-rails.5.1.x
+++ /dev/null
@@ -1,21 +0,0 @@
-source "http://rubygems.org"
-
-gemspec :path => ".."
-
-gem "activerecord", "~> 5.1.0"
-
-group :development do
-  gem 'mocha'
-  gem "rake"
-  gem "yard"
-
-  platforms :ruby do
-    gem "sqlite3", '~> 1.3.13'
-    gem "redcarpet"
-  end
-
-  platforms :jruby do
-    gem "activerecord-jdbcsqlite3-adapter"
-    gem "jruby-openssl", :require => false # Silence openssl warnings.
-  end
-end
diff --git a/gemfiles/Gemfile-rails.7.0.x b/gemfiles/Gemfile-rails.7.0.x
index 61f08e2c..be4e5090 100644
--- a/gemfiles/Gemfile-rails.7.0.x
+++ b/gemfiles/Gemfile-rails.7.0.x
@@ -2,6 +2,11 @@ source "http://rubygems.org"
 
 gemspec :path => ".."
 
+gem "bigdecimal" # is a bundled gem since Ruby 3.4
+gem "concurrent-ruby", "< 1.3.5" # https://github.com/rails/rails/issues/54260
+gem "drb" # is a bundled gem since Ruby 3.4
+gem "mutex_m" # is a bundled gem since Ruby 3.4
+
 gem "activerecord", "~> 7.0.0"
 
 group :development do
@@ -10,7 +15,7 @@ group :development do
   gem "yard"
 
   platforms :ruby do
-    gem "sqlite3", '~> 1.4'
+    gem "sqlite3", "~> 1.4"
     gem "redcarpet"
   end
 
diff --git a/gemfiles/Gemfile-rails.6.1.x b/gemfiles/Gemfile-rails.7.1.x
similarity index 84%
rename from gemfiles/Gemfile-rails.6.1.x
rename to gemfiles/Gemfile-rails.7.1.x
index f686f7bc..da8b2706 100644
--- a/gemfiles/Gemfile-rails.6.1.x
+++ b/gemfiles/Gemfile-rails.7.1.x
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 gemspec :path => ".."
 
-gem "activerecord", "~> 6.1.1"
+gem "activerecord", "~> 7.1.0"
 
 group :development do
   gem 'mocha'
@@ -10,7 +10,7 @@ group :development do
   gem "yard"
 
   platforms :ruby do
-    gem "sqlite3", '~> 1.4'
+    gem "sqlite3"
     gem "redcarpet"
   end
 
diff --git a/gemfiles/Gemfile-rails.5.2.x b/gemfiles/Gemfile-rails.7.2.x
similarity index 83%
rename from gemfiles/Gemfile-rails.5.2.x
rename to gemfiles/Gemfile-rails.7.2.x
index 8cc48395..d278eca8 100644
--- a/gemfiles/Gemfile-rails.5.2.x
+++ b/gemfiles/Gemfile-rails.7.2.x
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 gemspec :path => ".."
 
-gem "activerecord", "~> 5.2.0"
+gem "activerecord", "~> 7.2.0"
 
 group :development do
   gem 'mocha'
@@ -10,7 +10,7 @@ group :development do
   gem "yard"
 
   platforms :ruby do
-    gem "sqlite3", '~> 1.3.13'
+    gem "sqlite3"
     gem "redcarpet"
   end
 
diff --git a/gemfiles/Gemfile-rails.6.0.x b/gemfiles/Gemfile-rails.8.0.x
similarity index 83%
rename from gemfiles/Gemfile-rails.6.0.x
rename to gemfiles/Gemfile-rails.8.0.x
index dcc5e727..447abdb1 100644
--- a/gemfiles/Gemfile-rails.6.0.x
+++ b/gemfiles/Gemfile-rails.8.0.x
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 gemspec :path => ".."
 
-gem "activerecord", "~> 6.0.0rc1"
+gem "activerecord", "~> 8.0.0"
 
 group :development do
   gem 'mocha'
@@ -10,7 +10,7 @@ group :development do
   gem "yard"
 
   platforms :ruby do
-    gem "sqlite3", '~> 1.4'
+    gem "sqlite3"
     gem "redcarpet"
   end
 
diff --git a/test/unit/rake_task_test.rb b/test/unit/rake_task_test.rb
index 790d284c..63d9ab68 100644
--- a/test/unit/rake_task_test.rb
+++ b/test/unit/rake_task_test.rb
@@ -113,7 +113,7 @@ def teardown
     rescue => e
       message = e.message
     end
-    assert_match(/#{Regexp.escape(<<-MSG.strip).gsub("xxx", ".*?")}/, message
+    assert_match(/#{Regexp.escape(<<-MSG.strip).gsub("`xxx'", "(`|').*?")}/, message
 Loading models failed!
 Error occurred while loading application: FooBar (RuntimeError)
     test/unit/rake_task_test.rb:#{l1}:in `xxx'