diff --git a/active_model_serializers.gemspec b/active_model_serializers.gemspec
index a57b8d9a..a6353ff9 100644
--- a/active_model_serializers.gemspec
+++ b/active_model_serializers.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.1'
 
-  rails_versions = ['>= 4.1', '< 6.1']
+  rails_versions = ['>= 4.1']
   spec.add_runtime_dependency 'activemodel', rails_versions
   # 'activesupport', rails_versions
   # 'builder'