diff --git a/.rubocop.yml b/.rubocop.yml
index bf92819..f1d22d3 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,3 +1,6 @@
+AllCops:
+  NewCops: enable
+
 Style/StringLiterals:
   Enabled: true
   EnforcedStyle: double_quotes
@@ -9,9 +12,6 @@ Style/StringLiteralsInInterpolation:
 Layout/LineLength:
   Max: 190
 
-Metrics/BlockLength:
-  Max: 60
-
 Metrics/ParameterLists:
   Max: 8
 
diff --git a/lib/activitypub/actor.rb b/lib/activitypub/actor.rb
index bb2d5f6..902f526 100644
--- a/lib/activitypub/actor.rb
+++ b/lib/activitypub/actor.rb
@@ -17,7 +17,7 @@ module ActivityPub
   class Actor
     attr_accessor :id, :type, :name, :preferred_username, :inbox, :outbox, :followers, :following
 
-    def initialize(id:, type: "Person", name:, preferred_username:, inbox:, outbox:, followers: nil, following: nil)
+    def initialize(id:, name:, preferred_username:, inbox:, outbox:, type: "Person", followers: nil, following: nil)
       @id                = id
       @type              = type
       @name              = name
@@ -58,5 +58,25 @@ def self.from_h(hash)
         following: hash["following"]
       )
     end
+
+    class Person < Actor
+      # Attributes and methods specific to a Person actor type.
+    end
+
+    class Service < Actor
+      # Attributes and methods specific to a Service actor type.
+    end
+
+    class Group < Actor
+      # Attributes and methods specific to a Group actor type.
+    end
+
+    class Organization < Actor
+      # Attributes and methods specific to an Organization actor type.
+    end
+
+    class Application < Actor
+      # Attributes and methods specific to an Application actor type.
+    end
   end
 end
diff --git a/lib/activitypub/outbox.rb b/lib/activitypub/outbox.rb
index b629ada..29ea7c4 100644
--- a/lib/activitypub/outbox.rb
+++ b/lib/activitypub/outbox.rb
@@ -21,12 +21,10 @@ def send_activity(target_inbox_url, activity_data)
       signature = ActivityPub::Signature.sign(activity_data, private_key)
 
       # Send the signed activity to the target actor's inbox
-      response = post_activity(target_inbox_url, activity_data, signature)
+      post_activity(target_inbox_url, activity_data, signature)
 
       # Save the activity in the outbox (not implemented here for simplicity, but would be in a real-world scenario)
       # save_activity(activity_data)
-
-      response
     end
 
     private
diff --git a/lib/activitypub/signature.rb b/lib/activitypub/signature.rb
index 3625205..807fe15 100644
--- a/lib/activitypub/signature.rb
+++ b/lib/activitypub/signature.rb
@@ -21,7 +21,7 @@ def self.generate_keypair
     # Signs data with the given private key
     def self.sign(data, private_key_pem)
       private_key = OpenSSL::PKey::RSA.new(private_key_pem)
-      signature = private_key.sign(OpenSSL::Digest::SHA256.new, data)
+      signature = private_key.sign(OpenSSL::Digest.new("SHA256"), data)
       Base64.encode64(signature).gsub("\n", "")
     end
 
@@ -29,7 +29,7 @@ def self.sign(data, private_key_pem)
     def self.verify?(data, signature, public_key_pem)
       public_key = OpenSSL::PKey::RSA.new(public_key_pem)
       signature_decoded = Base64.decode64(signature)
-      public_key.verify(OpenSSL::Digest::SHA256.new, signature_decoded, data)
+      public_key.verify(OpenSSL::Digest.new("SHA256"), signature_decoded, data)
     end
   end
 end