build.gemspec in build-2.2.0 vs build.gemspec in build-2.3.0

@@ -15,15 +15,16 @@
 	spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
 	spec.require_paths = ["lib"]
 
   spec.required_ruby_version = '>= 2.0'
 	
-	spec.add_dependency "build-graph", "~> 1.2"
+	spec.add_dependency "build-graph", "~> 1.3"
 	spec.add_dependency "build-environment", "~> 1.3"
 	spec.add_dependency "build-dependency", "~> 1.4"
 	spec.add_dependency "build-makefile", "~> 1.0"
 	
-	spec.add_dependency "graphviz"
+	spec.add_dependency "graphviz", "~> 1.0"
+	spec.add_dependency "event", "~> 1.0"
 	
 	spec.add_development_dependency "covered"
 	spec.add_development_dependency "bundler"
 	spec.add_development_dependency "rspec", "~> 3.6"
 	spec.add_development_dependency "rake"