diff --git a/.github/workflows/rspec.yml b/.github/workflows/rspec.yml
index ef60cc7..325c5d1 100755
--- a/.github/workflows/rspec.yml
+++ b/.github/workflows/rspec.yml
@@ -12,13 +12,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["2.5.x", "2.6.x"]
+        ruby-version: ['3.1', '3.0', '2.7', '2.6', '2.5']
     steps:
-      - uses: actions/checkout@v1
-      - name: Set up Ruby
-        uses: actions/setup-ruby@v1
+      - uses: actions/checkout@v2
+      - name: Set up Ruby ${{ matrix.ruby-version }}
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: ${{ matrix.ruby-version }}
       - name: Install Bundler
         run: |
           gem install bundler
diff --git a/lib/sniffer/adapters/ethon_adapter.rb b/lib/sniffer/adapters/ethon_adapter.rb
index 2a93d88..7c1bef5 100644
--- a/lib/sniffer/adapters/ethon_adapter.rb
+++ b/lib/sniffer/adapters/ethon_adapter.rb
@@ -93,16 +93,14 @@ def perform
 
 if defined?(::Ethon::Easy)
   if defined?(Sniffer::Adapters::EthonAdapter::PREPEND)
-    Ethon::Easy::Http.prepend Sniffer::Adapters::EthonAdapter::Http::Prepend
-    Ethon::Easy::Operations.prepend Sniffer::Adapters::EthonAdapter::Operations::Prepend
+    Ethon::Easy.prepend Sniffer::Adapters::EthonAdapter::Http::Prepend
+    Ethon::Easy.prepend Sniffer::Adapters::EthonAdapter::Operations::Prepend
   else
-    Ethon::Easy::Http.class_eval do
+    Ethon::Easy.class_eval do
       include Sniffer::Adapters::EthonAdapter::Http
       alias_method :http_request_without_sniffer, :http_request
       alias_method :http_request, :http_request_with_sniffer
-    end
 
-    Ethon::Easy::Operations.class_eval do
       include Sniffer::Adapters::EthonAdapter::Operations
       alias_method :perform_without_sniffer, :perform
       alias_method :perform, :perform_with_sniffer
diff --git a/lib/sniffer/data_item.rb b/lib/sniffer/data_item.rb
index c5d7d5b..059456a 100644
--- a/lib/sniffer/data_item.rb
+++ b/lib/sniffer/data_item.rb
@@ -1,33 +1,23 @@
 # frozen_string_literal: true
 
-require 'active_attr'
+require 'dry-initializer'
 require 'json'
 require_relative 'request_policy'
 
 module Sniffer
   # Sniffer data item stores a request info
   class DataItem
-    include ActiveAttr::MassAssignment
-    attr_accessor :request, :response
+    extend Dry::Initializer
+
+    attr_writer :request, :response
+
+    option :request, optional: true
+    option :response, optional: true
 
     def to_h
       {
-        request: # frozen_string_literal: true
-# Sniffer data item stores a request info
-# Basic object for request and response objects
-# Stores http request data
-# rubocop:enable
-# Stores http response data
-
-request&.to_h,
-        response: # frozen_string_literal: true
-# Sniffer data item stores a request info
-# Basic object for request and response objects
-# Stores http request data
-# rubocop:enable
-# Stores http response data
-
-response&.to_h
+        request: request&.to_h,
+        response: response&.to_h
       }
     end
 
@@ -49,7 +39,7 @@ def allowed_to_sniff?
 
     # Basic object for request and response objects
     class HttpObject
-      include ActiveAttr::MassAssignment
+      extend Dry::Initializer
 
       def log_message
         raise NotImplementedError
@@ -62,7 +52,14 @@ def log_settings
 
     # Stores http request data
     class Request < HttpObject
-      attr_accessor :host, :port, :query, :method, :headers, :body
+      option :host, optional: true
+      option :port, optional: true
+      option :query, optional: true
+      option :method, optional: true
+      option :headers, optional: true
+      option :body, optional: true
+
+      attr_writer :host, :port, :query, :method, :headers, :body
 
       def to_h
         {
@@ -70,14 +67,7 @@ def to_h
           query: query,
           port: port,
           headers: headers,
-          body: # frozen_string_literal: true
-# Sniffer data item stores a request info
-# Basic object for request and response objects
-# Stores http request data
-# rubocop:enable
-# Stores http response data
-
-body&.to_s,
+          body: body&.to_s,
           method: method
         }
       end
@@ -106,20 +96,18 @@ def to_log
 
     # Stores http response data
     class Response < HttpObject
-      attr_accessor :status, :headers, :body, :timing
+      attr_writer :status, :headers, :body, :timing
+
+      option :status, optional: true
+      option :headers, optional: true
+      option :body, optional: true
+      option :timing, optional: true
 
       def to_h
         {
           status: status,
           headers: headers,
-          body: # frozen_string_literal: true
-# Sniffer data item stores a request info
-# Basic object for request and response objects
-# Stores http request data
-# rubocop:enable
-# Stores http response data
-
-body&.to_s,
+          body: body&.to_s,
           timing: timing
         }
       end
diff --git a/sniffer.gemspec b/sniffer.gemspec
index cb9b372..f273e5d 100644
--- a/sniffer.gemspec
+++ b/sniffer.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "anyway_config", ">= 1.0"
-  spec.add_dependency "active_attr", ">= 0.10.2"
+  spec.add_dependency "dry-initializer", "~> 3"
 
   spec.add_development_dependency "bundler", "~> 2"
   spec.add_development_dependency "rake", ">= 12.3.3"