diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 102ccf3..9db54a2 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -134,6 +134,10 @@ jobs:
           gemfile: gemfiles/rails_4_1.gemfile
         - ruby: "2.7"
           gemfile: gemfiles/rails_4_2.gemfile
+        - ruby: "2.7"
+          gemfile: Gemfile
+        - ruby: "2.7"
+          gemfile: gemfiles/rails_head.gemfile
         - ruby: "3.0"
           gemfile: gemfiles/rails_3_0.gemfile
         - ruby: "3.0"
@@ -152,6 +156,10 @@ jobs:
           gemfile: gemfiles/rails_5_1.gemfile
         - ruby: "3.0"
           gemfile: gemfiles/rails_5_2.gemfile
+        - ruby: "3.0"
+          gemfile: Gemfile
+        - ruby: "3.0"
+          gemfile: gemfiles/rails_head.gemfile
         - ruby: "3.1"
           gemfile: gemfiles/rails_3_0.gemfile
         - ruby: "3.1"
diff --git a/active_attr.gemspec b/active_attr.gemspec
index 2ee5584..50d0604 100644
--- a/active_attr.gemspec
+++ b/active_attr.gemspec
@@ -22,9 +22,9 @@ Gem::Specification.new do |gem|
 
   gem.required_ruby_version = ">= 2.1.0"
 
-  gem.add_runtime_dependency "actionpack",    ">= 3.0.2", "< 7.3"
-  gem.add_runtime_dependency "activemodel",   ">= 3.0.2", "< 7.3"
-  gem.add_runtime_dependency "activesupport", ">= 3.0.2", "< 7.3"
+  gem.add_runtime_dependency "actionpack",    ">= 3.0.2", "< 8.0"
+  gem.add_runtime_dependency "activemodel",   ">= 3.0.2", "< 8.0"
+  gem.add_runtime_dependency "activesupport", ">= 3.0.2", "< 8.0"
 
   gem.add_development_dependency "bundler"
   gem.add_development_dependency "factory_bot",  "< 7.0"