diff --git a/grape-active_model_serializers.gemspec b/grape-active_model_serializers.gemspec
index fc68ea4..ea6f8b0 100644
--- a/grape-active_model_serializers.gemspec
+++ b/grape-active_model_serializers.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.licenses      = ['MIT']
 
   gem.add_dependency "grape", "~> 0.3"
-  gem.add_dependency "active_model_serializers", ">= 0.9.0.alpha1"
+  gem.add_dependency "active_model_serializers", ">= 0.9.0"
 
   gem.add_development_dependency "rspec"
   gem.add_development_dependency "rack-test"
diff --git a/spec/grape-active_model_serializers/endpoint_extension_spec.rb b/spec/grape-active_model_serializers/endpoint_extension_spec.rb
index 04ddf17..e296dd3 100644
--- a/spec/grape-active_model_serializers/endpoint_extension_spec.rb
+++ b/spec/grape-active_model_serializers/endpoint_extension_spec.rb
@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe 'Grape::EndpointExtension' do
 
-  subject { Grape::Endpoint.new(nil, {path: '/', method: 'foo'}) }
+  subject { Grape::Endpoint.new({}, {path: '/', method: 'foo'}) }
 
   let(:serializer) { Grape::Formatter::ActiveModelSerializers }