diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index aacbf431..a387a253 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,8 +24,10 @@ jobs:
     strategy:
       matrix:
         ruby: ["3.2", "3.3"]
-        activemodel: ["7.1"]
+        activemodel: ["7.1", "8.0"]
         include:
+          - activemodel: "8.0"
+            ruby: "3.3"
           - activemodel: "7.0"
             ruby: "3.2"
           - activemodel: "6.1"
diff --git a/active_interaction.gemspec b/active_interaction.gemspec
index 4278e003..630e1579 100644
--- a/active_interaction.gemspec
+++ b/active_interaction.gemspec
@@ -36,8 +36,8 @@ Gem::Specification.new do |spec| # rubocop:disable Metrics/BlockLength
     Dir.glob(File.join('lib', 'active_interaction', 'locale', '*.yml'))
   spec.test_files = Dir.glob(File.join('spec', '**', '*.rb'))
 
-  spec.add_dependency 'activemodel', '>= 5.2', '< 8'
-  spec.add_dependency 'activesupport', '>= 5.2', '< 8'
+  spec.add_dependency 'activemodel', '>= 5.2', '< 9'
+  spec.add_dependency 'activesupport', '>= 5.2', '< 9'
 
   {
     'actionpack' => [],
diff --git a/gemfiles/rails-8.0.gemfile b/gemfiles/rails-8.0.gemfile
new file mode 100644
index 00000000..034476be
--- /dev/null
+++ b/gemfiles/rails-8.0.gemfile
@@ -0,0 +1,7 @@
+source 'https://rubygems.org'
+
+gemspec path: '..'
+
+gem 'activemodel', '~> 8.0.0'
+gem 'activerecord', '~> 8.0.0'
+gem 'sqlite3', '>= 2.1'