diff --git a/.circleci/config.yml b/.circleci/config.yml
index 025e27a..6c6e52f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -12,6 +12,7 @@ workflows:
           matrix:
             parameters:
               ruby_version:
+                - '3.4.2'
                 - '3.3.0'
                 - '3.2.1'
                 - '3.1.3'
diff --git a/Appraisals b/Appraisals
index 3c3f4d8..f55420e 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 case RUBY_VERSION
-when '3.1.3', '3.2.1', '3.3.0'
+when '3.1.3', '3.2.1', '3.3.0', '3.4.2'
   appraise "ruby-#{RUBY_VERSION}_activerecord61" do
     source 'https://rubygems.org' do
       gem 'activerecord', '~> 6.1.0'
@@ -25,6 +25,12 @@ when '3.1.3', '3.2.1', '3.3.0'
       gem 'activerecord', '~> 7.2.0'
     end
   end
+
+  appraise "ruby-#{RUBY_VERSION}_activerecord80" do
+  source 'https://rubygems.org' do
+    gem 'activerecord', '~> 8.0.0'
+  end
+end
 else
   raise "Unsupported Ruby version #{RUBY_VERSION}"
 end
diff --git a/Gemfile b/Gemfile
index 953da69..8f6cba5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@
 source 'https://rubygems.org' # global source
 
 source 'https://rubygems.org' do
-  gem 'activesupport', '>= 6.1', '< 7.3'
+  gem 'activesupport', '>= 6.1', '< 8.1'
   gem 'appraisal', '>= 2.5', '< 3'
   gem 'bundler', '>= 2.2', '< 3'
   gem 'debug', '>= 1.9', '< 2'
diff --git a/store_base_sti_class.gemspec b/store_base_sti_class.gemspec
index c20222f..dfc2b80 100644
--- a/store_base_sti_class.gemspec
+++ b/store_base_sti_class.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |spec|
     compatibility.'
   MSG
   spec.summary       = <<~MSG
-    Modifies ActiveRecord 6.1.x - 7.2.x with the ability to store the actual class (instead of the base class) in
+    Modifies ActiveRecord 6.1.x - 8.0.x with the ability to store the actual class (instead of the base class) in
     polymorhic _type columns when using STI.
   MSG
   spec.homepage      = 'https://github.com/appfolio/store_base_sti_class'
@@ -23,8 +23,8 @@ Gem::Specification.new do |spec|
   spec.files         = Dir['**/*'].select { |f| f[%r{^(lib/|LICENSE.txt|.*gemspec)}] }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = Gem::Requirement.new('< 3.4')
+  spec.required_ruby_version = Gem::Requirement.new('< 3.5')
   spec.metadata['allowed_push_host'] = 'https://rubygems.org'
 
-  spec.add_dependency('activerecord', ['>= 6.1', '< 7.3'])
+  spec.add_dependency('activerecord', ['>= 6.1', '< 8.1'])
 end