diff --git a/fluent-plugin-sqs.gemspec b/fluent-plugin-sqs.gemspec
deleted file mode 100644
index bba77f8..0000000
--- a/fluent-plugin-sqs.gemspec
+++ /dev/null
@@ -1,55 +0,0 @@
-# -*- encoding: utf-8 -*-
-
-Gem::Specification.new do |s|
-  s.name = 'fluent-plugin-sqs'
-  s.version = '3.0.0'
-
-  s.required_rubygems_version = Gem::Requirement.new('>= 0') if s.respond_to? :required_rubygems_version=
-  s.authors = ['Yuri Odagiri']
-  s.date = '2018-04-24'
-  s.email = 'ixixizko@gmail.com'
-  s.license = 'Apache-2.0'
-  s.extra_rdoc_files = [
-    'README.rdoc'
-  ]
-  s.files = [
-    'AUTHORS',
-    'Rakefile',
-    'VERSION',
-    'lib/fluent/plugin/in_sqs.rb',
-    'lib/fluent/plugin/out_sqs.rb',
-    'spec/lib/fluent/plugin/in_sqs_spec.rb',
-    'spec/lib/fluent/plugin/out_sqs_spec.rb',
-    'spec/spec_helper.rb'
-  ]
-  s.homepage = 'https://github.com/ixixi/fluent-plugin-sqs'
-  s.require_paths = ['lib']
-  s.rubygems_version = '1.8.23'
-  s.summary = 'Amazon SQS input/output plugin for Fluent event collector'
-  s.test_files = ['spec/lib/fluent/plugin/in_sqs_spec.rb', 'spec/lib/fluent/plugin/out_sqs_spec.rb', 'spec/spec_helper.rb']
-
-  if s.respond_to? :specification_version
-    s.specification_version = 3
-
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0')
-      s.add_runtime_dependency('fluentd', ['>= 0.12.0', '< 2'])
-      s.add_runtime_dependency('aws-sdk-sqs', ['~> 1'])
-      s.add_runtime_dependency('yajl-ruby', ['~> 1.0'])
-    else
-      s.add_dependency('fluentd', ['>= 0.12.0', '< 2'])
-      s.add_dependency('aws-sdk-sqs', ['~> 1'])
-      s.add_dependency('yajl-ruby', ['~> 1.0'])
-    end
-  else
-    s.add_dependency('fluentd', ['>= 0.14.15', '< 2'])
-    s.add_dependency('aws-sdk-sqs', ['~> 1'])
-    s.add_dependency('yajl-ruby', ['~> 1.0'])
-  end
-  s.add_development_dependency 'bundler'
-  s.add_development_dependency 'rake'
-  s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rr'
-  s.add_development_dependency 'pry'
-  s.add_development_dependency 'jeweler'
-  s.add_development_dependency 'test-unit', '>= 3.0.0'
-end