diff --git a/async-dns.gemspec b/async-dns.gemspec
index 7b22dff..e8f8222 100644
--- a/async-dns.gemspec
+++ b/async-dns.gemspec
@@ -25,5 +25,6 @@ Gem::Specification.new do |spec|
 	
 	spec.required_ruby_version = ">= 3.1"
 	
+	spec.add_dependency "async"	
 	spec.add_dependency "io-endpoint"
 end