diff --git a/sensu-plugins-network-checks.gemspec b/sensu-plugins-network-checks.gemspec
index cc296dc..2b5416d 100644
--- a/sensu-plugins-network-checks.gemspec
+++ b/sensu-plugins-network-checks.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
 
   s.add_runtime_dependency 'sensu-plugin',  '~> 4.0'
 
-  s.add_runtime_dependency 'activesupport', '~> 4.2'
+  s.add_runtime_dependency 'activesupport', '>= 4.2', '< 7.0'
   s.add_runtime_dependency 'dnsbl-client',  '1.0.2'
   s.add_runtime_dependency 'net-ping',      '1.7.8'
   s.add_runtime_dependency 'whois',         '>= 4.0'