diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c9a57e1..d5d714f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,23 +17,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        gemfile: ['rails_7.0', 'rails_7.1']
-        ruby: [3.3, 3.2, 3.1]
+        gemfile: ['rails_7.0', 'rails_7.1', 'rails_8.0']
+        ruby: [3.3, 3.2]
         include:
+          - gemfile: rails_7.1
+            ruby: '3.1'
+          - gemfile: rails_7.0
+            ruby: '3.1'
           - gemfile: rails_7.0
             ruby: '3.0'
           - gemfile: rails_7.0
             ruby: 2.7
           - gemfile: rails_6.1
             ruby: 2.7
-          - gemfile: rails_6.0
-            ruby: 2.7
-          - gemfile: rails_5.2
-            ruby: 2.7
-          - gemfile: rails_5.1
-            ruby: 2.7
-          - gemfile: rails_5.0
-            ruby: 2.7
 
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
diff --git a/gemfiles/rails_5.0.gemfile b/gemfiles/rails_5.0.gemfile
deleted file mode 100644
index fe17ba9..0000000
--- a/gemfiles/rails_5.0.gemfile
+++ /dev/null
@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-source "https://rubygems.org"
-
-gem "rails", "~> 5.0.7"
-gem "sqlite3", "~> 1.3.6"
-
-gemspec path: "../"
diff --git a/gemfiles/rails_5.1.gemfile b/gemfiles/rails_5.1.gemfile
deleted file mode 100644
index 16067aa..0000000
--- a/gemfiles/rails_5.1.gemfile
+++ /dev/null
@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-source "https://rubygems.org"
-
-gem "rails", "~> 5.1.7"
-gem "sqlite3", "~> 1.3.6"
-
-gemspec path: "../"
diff --git a/gemfiles/rails_5.2.gemfile b/gemfiles/rails_5.2.gemfile
deleted file mode 100644
index 3b10fc4..0000000
--- a/gemfiles/rails_5.2.gemfile
+++ /dev/null
@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-source "https://rubygems.org"
-
-gem "rails", "~> 5.2.6"
-gem "sqlite3", "~> 1.4.1"
-
-gemspec path: "../"
diff --git a/gemfiles/rails_7.0.gemfile b/gemfiles/rails_7.0.gemfile
index f32a1ff..f395ee7 100644
--- a/gemfiles/rails_7.0.gemfile
+++ b/gemfiles/rails_7.0.gemfile
@@ -3,6 +3,6 @@
 source "https://rubygems.org"
 
 gem "rails", "~> 7.0.2"
-gem "sqlite3"
+gem "sqlite3", "~> 1.4.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_7.1.gemfile b/gemfiles/rails_7.1.gemfile
index 0f1d346..1b7beb0 100644
--- a/gemfiles/rails_7.1.gemfile
+++ b/gemfiles/rails_7.1.gemfile
@@ -2,7 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "active_attr", "~> 0.16" # git: "https://github.com/mathieujobin/active_attr", branch: "rails-7.1-support"
 gem "rails", "~> 7.1.1"
 gem "sqlite3"
 
diff --git a/gemfiles/rails_6.0.gemfile b/gemfiles/rails_8.0.gemfile
similarity index 80%
rename from gemfiles/rails_6.0.gemfile
rename to gemfiles/rails_8.0.gemfile
index 2a3054b..a1651b2 100644
--- a/gemfiles/rails_6.0.gemfile
+++ b/gemfiles/rails_8.0.gemfile
@@ -2,7 +2,7 @@
 
 source "https://rubygems.org"
 
-gem "rails", "~> 6.0.4"
+gem "rails", "~> 8.0.1"
 gem "sqlite3"
 
 gemspec path: "../"
diff --git a/lib/webhook_system.rb b/lib/webhook_system.rb
index 9d2ef4d..79c15fe 100644
--- a/lib/webhook_system.rb
+++ b/lib/webhook_system.rb
@@ -3,7 +3,6 @@
 require 'active_support/all'
 require 'active_record'
 require 'active_job'
-require 'ph_model'
 require 'validate_url'
 require 'faraday'
 require 'faraday-encoding'
diff --git a/lib/webhook_system/base_event.rb b/lib/webhook_system/base_event.rb
index f8cce27..a906eb7 100644
--- a/lib/webhook_system/base_event.rb
+++ b/lib/webhook_system/base_event.rb
@@ -4,10 +4,12 @@ module WebhookSystem
 
   # This is the class meant to be used as the base class for any Events sent through the Webhook system
   class BaseEvent
-    include PhModel
+    include ActiveModel::Attributes
+    include ActiveModel::AttributeAssignment
+    include ActiveModel::Validations
 
-    def initialize(*args, &block)
-      super(*args, &block)
+    def initialize(...)
+      super
       @event_id = SecureRandom.uuid.freeze
     end
 
@@ -39,6 +41,10 @@ def as_json
       result.deep_stringify_keys
     end
 
+    def self.build(attrs)
+      new.tap { |instance| instance.assign_attributes(attrs) }
+    end
+
     def self.key_is_reserved?(key)
       key.to_s.in? %w[event event_id]
     end
diff --git a/lib/webhook_system/encoder.rb b/lib/webhook_system/encoder.rb
index 75837cd..cb1362a 100644
--- a/lib/webhook_system/encoder.rb
+++ b/lib/webhook_system/encoder.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'base64'
+
 module WebhookSystem
 
   # Class in charge of encoding and decoding encrypted payload
diff --git a/lib/webhook_system/event_log.rb b/lib/webhook_system/event_log.rb
index 192084a..9fa0a82 100644
--- a/lib/webhook_system/event_log.rb
+++ b/lib/webhook_system/event_log.rb
@@ -15,8 +15,8 @@ class EventLog < ActiveRecord::Base
     validates :event_name, presence: true
     validates :status, presence: true
 
-    serialize :request, JSON
-    serialize :response, JSON
+    serialize :request, coder: JSON
+    serialize :response, coder: JSON
 
     def self.construct(subscription, event, request, response)
       request_info = {
diff --git a/lib/webhook_system/subscription.rb b/lib/webhook_system/subscription.rb
index fba26bc..638cd70 100644
--- a/lib/webhook_system/subscription.rb
+++ b/lib/webhook_system/subscription.rb
@@ -53,10 +53,8 @@ def topic_names=(new_topics)
       new_topics.reject!(&:blank?)
       add_topics = new_topics - topic_names
 
-      new_topics_attributes = []
-
-      topics.each do |topic|
-        new_topics_attributes << {
+      new_topics_attributes = topics.map do |topic|
+        {
           id: topic.id,
           name: topic.name,
           _destroy: new_topics.exclude?(topic.name),
diff --git a/spec/event_spec.rb b/spec/event_spec.rb
index da6139b..3157f8e 100644
--- a/spec/event_spec.rb
+++ b/spec/event_spec.rb
@@ -5,13 +5,20 @@
 describe WebhookSystem, aggregate_failures: true do
   let(:widget_class) do
     Class.new do
-      include PhModel
+      include ActiveModel::Attributes
+      include ActiveModel::AttributeAssignment
+      include ActiveModel::Validations
+
       attribute :foo
       attribute :bar
 
       def as_json
         { foo: foo, bar: bar }
       end
+
+      def self.build(attrs)
+        new.tap { |instance| instance.assign_attributes(attrs) }
+      end
     end
   end
 
diff --git a/spec/integration_spec.rb b/spec/integration_spec.rb
index d41f5b8..0f8c279 100644
--- a/spec/integration_spec.rb
+++ b/spec/integration_spec.rb
@@ -31,7 +31,7 @@ def payload_attributes
     end
   end
 
-  let(:event) { event_class.build(name: 'John', age: 21) }
+  let(:event) { event_class.new.tap { |e| e.assign_attributes(name: 'John', age: 21) } }
 
   let(:expected_payload) do
     {
diff --git a/test.db-shm b/test.db-shm
new file mode 100644
index 0000000..b371393
Binary files /dev/null and b/test.db-shm differ
diff --git a/test.db-wal b/test.db-wal
new file mode 100644
index 0000000..0e80a56
Binary files /dev/null and b/test.db-wal differ
diff --git a/webhook_system.gemspec b/webhook_system.gemspec
index b932e9b..71d3de4 100644
--- a/webhook_system.gemspec
+++ b/webhook_system.gemspec
@@ -37,12 +37,12 @@ Gem::Specification.new do |gem|
   }
 
   gem.required_ruby_version = '> 2.7.0'
-  gem.add_runtime_dependency 'activesupport', '> 5.0', '< 7.2'
-  gem.add_runtime_dependency 'activerecord', '> 5.0', '< 7.2'
-  gem.add_runtime_dependency 'activejob', '> 5.0', '< 7.2'
+  gem.add_runtime_dependency 'activemodel', '>= 6.1', '< 8.1'
+  gem.add_runtime_dependency 'activesupport', '>= 6.1', '< 8.1'
+  gem.add_runtime_dependency 'activerecord', '>= 6.1', '< 8.1'
+  gem.add_runtime_dependency 'activejob', '>= 6.1', '< 8.1'
   gem.add_runtime_dependency 'faraday', '> 0.9'
   gem.add_runtime_dependency 'faraday-encoding', '>= 0.0.2', '< 1.0'
-  gem.add_runtime_dependency 'ph_model'
   gem.add_runtime_dependency 'validate_url', '~> 1.0'
 
   gem.add_development_dependency 'bundler', '> 1.17', '< 2.6'