diff --git a/lib/zerobounce/configuration.rb b/lib/zerobounce/configuration.rb
index efc5a17..8a75e12 100644
--- a/lib/zerobounce/configuration.rb
+++ b/lib/zerobounce/configuration.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'faraday'
-require 'faraday_middleware'
 require 'zerobounce/middleware/raise_error'
 
 module Zerobounce
@@ -48,7 +47,7 @@ def initialize
         builder.response(:json, content_type: /\bjson$/, parser_options: { symbolize_names: true })
         builder.response(:logger) { |l| l.filter(/(api_?key=)(\w+)/, '\1[REMOVED]') } if ENV['ZEROBOUNCE_API_DEBUG']
         builder.use(Zerobounce::Middleware::RaiseError)
-        builder.adapter(Faraday.default_adapter)
+        builder.adapter(:net_http)
       end
     end
   end
diff --git a/spec/zerobounce/configuration_spec.rb b/spec/zerobounce/configuration_spec.rb
index e44b48a..018e96d 100644
--- a/spec/zerobounce/configuration_spec.rb
+++ b/spec/zerobounce/configuration_spec.rb
@@ -34,9 +34,9 @@
       expect(builder).to have_received(:use).with(Zerobounce::Middleware::RaiseError)
     end
 
-    it 'uses Faraday default adapter' do
+    it 'uses net_http adapter' do
       described_class.new.middleware.call(builder)
-      expect(builder).to have_received(:adapter).with(Faraday.default_adapter)
+      expect(builder).to have_received(:adapter).with(:net_http)
     end
   end
 end
diff --git a/zerobounce.gemspec b/zerobounce.gemspec
index ad784b3..bc284e9 100644
--- a/zerobounce.gemspec
+++ b/zerobounce.gemspec
@@ -14,18 +14,18 @@ Gem::Specification.new do |spec| # rubocop:disable Metrics/BlockLength
   spec.description   = 'A Ruby client for Zerobounce.net.'
   spec.homepage      = 'https://github.com/afrase/zerobounce'
   spec.license       = 'MIT'
+  spec.required_ruby_version = '>= 2.5.0'
 
-  spec.files = `git ls-files -z`.split("\x0").reject do |f|
-    f.match(%r{^(test|spec|features)/})
-  end
+  spec.files = Dir.glob('{lib,exe}/**/*', File::FNM_DOTMATCH).reject do |f|
+    File.directory?(f) || f.match(%r{^(test|spec|features)/})
+  end + %w[README.md LICENSE.txt CHANGELOG.md].select { |f| File.exist?(f) }
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
   spec.metadata['yard.run'] = 'yri' # use "yard" to build full HTML docs.
 
-  spec.add_dependency 'faraday', '>= 0.14', '< 2.0'
-  spec.add_dependency 'faraday_middleware', '>= 0.12', '< 2.0'
+  spec.add_dependency 'faraday', '>= 0.14', '< 3.0'
 
   spec.add_development_dependency 'bundler', '~> 1.16'
   spec.add_development_dependency 'pry', '~> 0.13.0'