async-rspec.gemspec in async-rspec-1.4.0 vs async-rspec.gemspec in async-rspec-1.5.0

@@ -17,10 +17,10 @@
 	spec.require_paths = ["lib"]
 
 	spec.add_dependency "rspec", "~> 3.0"
 	
 	# Since we test the shared contexts, we need some bits of async:
-	spec.add_development_dependency "async"
+	spec.add_development_dependency "async", "~> 1.8"
 	spec.add_development_dependency "ruby-prof"
 	
 	spec.add_development_dependency "bundler", "~> 1.13"
 	spec.add_development_dependency "rake", "~> 10.0"
 end