async.gemspec in async-1.6.0 vs async.gemspec in async-1.7.0

@@ -21,10 +21,10 @@
 	spec.require_paths = ["lib"]
 	spec.has_rdoc      = "yard"
 	
 	spec.required_ruby_version = ">= 2.2.7"
 
-	spec.add_runtime_dependency "nio4r", "~> 2.0"
+	spec.add_runtime_dependency "nio4r", "~> 2.3"
 	spec.add_runtime_dependency "timers", "~> 4.1"
 	
 	spec.add_development_dependency "async-rspec", "~> 1.1"
 	
 	spec.add_development_dependency "bundler", "~> 1.3"