diff --git a/Gemfile.lock b/Gemfile.lock
index 5cc42de..333e0e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,8 +49,6 @@ GEM
     erubi (1.7.0)
     i18n (0.9.1)
       concurrent-ruby (~> 1.0)
-    jsonapi-renderer (0.2.0)
-    json (1.8.6)
     jsonapi-deserializable (0.2.0)
     jsonapi-rb (0.5.0)
       jsonapi-deserializable (~> 0.2.0)
@@ -58,17 +56,6 @@ GEM
     jsonapi-renderer (0.2.0)
     jsonapi-serializable (0.3.0)
       jsonapi-renderer (~> 0.2.0)
-    juwelier (2.1.3)
-      builder
-      bundler (>= 1.13)
-      git (>= 1.2.5)
-      github_api
-      highline (>= 1.6.15)
-      nokogiri (>= 1.5.10)
-      rake
-      rdoc
-      semver
-    jwt (1.5.6)
     loofah (2.1.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -119,12 +106,11 @@ DEPENDENCIES
   byebug
   fast_jsonapi!
   jsonapi-rb (~> 0.5.0)
-  juwelier (~> 2.1.0)
-  rdoc (~> 3.12)
+  oj (~> 3.3)
   rspec (~> 3.5.0)
   rspec-benchmark (~> 0.3.0)
   skylight (~> 1.3)
   sqlite3 (~> 1.3)
 
 BUNDLED WITH
-   1.16.0
+   1.16.1
diff --git a/fast_jsonapi.gemspec b/fast_jsonapi.gemspec
index 00cff64..ee2ccfc 100644
--- a/fast_jsonapi.gemspec
+++ b/fast_jsonapi.gemspec
@@ -20,57 +20,16 @@ Gem::Specification.new do |gem|
   gem.rubygems_version = "2.5.1"
   gem.summary = "fast JSON API(jsonapi.org) serializer"
 
-  if s.respond_to? :specification_version then
-    s.specification_version = 4
-
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<activesupport>, ["~> 5.0"])
-      s.add_runtime_dependency(%q<multi_json>, ["~> 1.12"])
-      s.add_runtime_dependency(%q<oj>, ["~> 3.3"])
-      s.add_runtime_dependency(%q<activerecord>, ["~> 5.0"])
-      s.add_development_dependency(%q<skylight>, ["~> 1.3"])
-      s.add_development_dependency(%q<rspec>, ["~> 3.5.0"])
-      s.add_development_dependency(%q<rspec-benchmark>, ["~> 0.3.0"])
-      s.add_development_dependency(%q<rdoc>, ["~> 3.12"])
-      s.add_development_dependency(%q<bundler>, ["~> 1.0"])
-      s.add_development_dependency(%q<juwelier>, ["~> 2.1.0"])
-      s.add_development_dependency(%q<simplecov>, [">= 0"])
-      s.add_development_dependency(%q<byebug>, [">= 0"])
-      s.add_development_dependency(%q<active_model_serializers>, ["~> 0.10.4"])
-      s.add_development_dependency(%q<sqlite3>, ["~> 1.3"])
-      s.add_development_dependency(%q<jsonapi-rb>, ["~> 0.5.0"])
-    else
-      s.add_dependency(%q<activesupport>, ["~> 5.0"])
-      s.add_dependency(%q<multi_json>, ["~> 1.12"])
-      s.add_dependency(%q<oj>, ["~> 3.3"])
-      s.add_dependency(%q<skylight>, ["~> 1.3"])
-      s.add_dependency(%q<activerecord>, ["~> 5.0"])
-      s.add_dependency(%q<rspec>, ["~> 3.5.0"])
-      s.add_dependency(%q<rspec-benchmark>, ["~> 0.3.0"])
-      s.add_dependency(%q<rdoc>, ["~> 3.12"])
-      s.add_dependency(%q<bundler>, ["~> 1.0"])
-      s.add_dependency(%q<juwelier>, ["~> 2.1.0"])
-      s.add_dependency(%q<simplecov>, [">= 0"])
-      s.add_dependency(%q<byebug>, [">= 0"])
-      s.add_dependency(%q<active_model_serializers>, ["~> 0.10.4"])
-      s.add_dependency(%q<sqlite3>, ["~> 1.3"])
-      s.add_dependency(%q<jsonapi-rb>, ["~> 0.5.0"])
-    end
-  else
-    s.add_dependency(%q<activesupport>, ["~> 5.0"])
-    s.add_dependency(%q<multi_json>, ["~> 1.12"])
-    s.add_dependency(%q<oj>, ["~> 3.3"])
-    s.add_dependency(%q<skylight>, ["~> 1.3"])
-    s.add_dependency(%q<activerecord>, ["~> 5.0"])
-    s.add_dependency(%q<rspec>, ["~> 3.5.0"])
-    s.add_dependency(%q<rspec-benchmark>, ["~> 0.3.0"])
-    s.add_dependency(%q<rdoc>, ["~> 3.12"])
-    s.add_dependency(%q<bundler>, ["~> 1.0"])
-    s.add_dependency(%q<juwelier>, ["~> 2.1.0"])
-    s.add_dependency(%q<simplecov>, [">= 0"])
-    s.add_dependency(%q<byebug>, [">= 0"])
-    s.add_dependency(%q<active_model_serializers>, ["~> 0.10.4"])
-    s.add_dependency(%q<sqlite3>, ["~> 1.3"])
-    s.add_dependency(%q<jsonapi-rb>, ["~> 0.5.0"])
-  end
+  gem.add_runtime_dependency(%q<activesupport>, ["~> 5.0"])
+  gem.add_runtime_dependency(%q<multi_json>, ["~> 1.12"])
+  gem.add_development_dependency(%q<activerecord>, ["~> 5.0"])
+  gem.add_development_dependency(%q<skylight>, ["~> 1.3"])
+  gem.add_development_dependency(%q<rspec>, ["~> 3.5.0"])
+  gem.add_development_dependency(%q<oj>, ["~> 3.3"])
+  gem.add_development_dependency(%q<rspec-benchmark>, ["~> 0.3.0"])
+  gem.add_development_dependency(%q<bundler>, ["~> 1.0"])
+  gem.add_development_dependency(%q<byebug>, [">= 0"])
+  gem.add_development_dependency(%q<active_model_serializers>, ["~> 0.10.4"])
+  gem.add_development_dependency(%q<sqlite3>, ["~> 1.3"])
+  gem.add_development_dependency(%q<jsonapi-rb>, ["~> 0.5.0"])
 end