diff --git a/turnip_formatter.gemspec b/turnip_formatter.gemspec
index 0dfa520..3206ad5 100644
--- a/turnip_formatter.gemspec
+++ b/turnip_formatter.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'rspec', [">=3.3", "<4.0"]
 
   # For ruby >= 2.1
-  spec.add_dependency 'activesupport', '>= 4.2.7', '< 7.0'
+  spec.add_dependency 'activesupport', '>= 4.2.7', '< 8.0'
 
   spec.add_development_dependency 'test-unit'
   spec.add_development_dependency 'test-unit-rr'