diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c36d729..cbb753b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,6 +28,15 @@ jobs:
             rails: '~> 8.0.0'
           - ruby: '3.4'
             rails: '~> 8.0.0'
+          - ruby: '4.0'
+            rails: '~> 8.0.0'
+          - ruby: '3.3'
+            rails: '~> 8.1.0'
+          - ruby: '3.4'
+            rails: '~> 8.1.0'
+          - ruby: '4.0'
+            rails: '~> 8.1.0'
+
 
     steps:
     - uses: actions/checkout@v5
@@ -39,6 +48,7 @@ jobs:
     - name: Set Rails version
       run: |
         echo "RAILS_VERSION=${{ matrix.rails }}" >> $GITHUB_ENV
+        echo "RUBY_VERSION=${{ matrix.ruby }}" >> $GITHUB_ENV
     - name: Install dependencies
       run: |
         bundle install --jobs 4 --retry 3
diff --git a/.rubocop.yml b/.rubocop.yml
index 1a7561a..f7a8af6 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,7 +1,6 @@
 plugins:
   - rubocop-rspec
   - rubocop-rake
-  - rubocop-rbs_inline
   - rubocop-factory_bot
 
 AllCops:
@@ -27,5 +26,5 @@ RSpec/ExampleLength:
 Metrics/ClassLength:
   Max: 150
 
- Metrics/MethodLength:
+Metrics/MethodLength:
   Max: 20
diff --git a/.rubocop_rbs.yml b/.rubocop_rbs.yml
new file mode 100644
index 0000000..a81a9f5
--- /dev/null
+++ b/.rubocop_rbs.yml
@@ -0,0 +1,9 @@
+# RuboCop configuration for Ruby 3.3+ with RBS Inline support
+inherit_from: .rubocop.yml
+
+plugins:
+  - rubocop-rbs_inline
+
+# ========= RBS ===========
+Style/RbsInline/MissingTypeAnnotation:
+  EnforcedStyle: method_type_signature
diff --git a/.ruby-version b/.ruby-version
index 4f5e697..fcdb2e1 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.5
+4.0.0
diff --git a/Gemfile b/Gemfile
index 417ccdd..f27bc04 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 source 'https://rubygems.org'
 
@@ -22,13 +23,17 @@ group :development, :test do
   gem 'factory_bot'
   gem 'lefthook', require: false
   gem 'rake', '~> 13.0'
-  gem 'rbs-inline', require: false
   gem 'rspec', '~> 3.0'
   gem 'rspec-parameterized'
   gem 'rubocop'
   gem 'rubocop-factory_bot', require: false
   gem 'rubocop-rake', require: false
-  gem 'rubocop-rbs_inline', require: false
   gem 'rubocop-rspec', require: false
-  gem 'steep', require: false
+
+  # rbs-inline requires Ruby 3.3+
+  if RUBY_VERSION >= '3.3.0'
+    gem 'rbs-inline', require: false
+    gem 'rubocop-rbs_inline', require: false
+    gem 'steep', require: false
+  end
 end
diff --git a/Rakefile b/Rakefile
index 0e0b70f..af5a5d4 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,14 +1,31 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
-require 'steep/rake_task'
 
 RSpec::Core::RakeTask.new(:spec)
 
 require 'rubocop/rake_task'
 
-RuboCop::RakeTask.new
-Steep::RakeTask.new
+# Use RBS Inline configuration for Ruby 3.3+
+rubocop_config = if RUBY_VERSION >= '3.3.0'
+                   '.rubocop_rbs.yml'
+                 else
+                   '.rubocop.yml'
+                 end
 
-task default: %i[spec rubocop steep]
+RuboCop::RakeTask.new do |task|
+  task.options = ['--config', rubocop_config]
+end
+
+# Steep is only available for Ruby 3.3+
+default_tasks = %i[spec rubocop]
+
+if RUBY_VERSION >= '3.3.0'
+  require 'steep/rake_task'
+  Steep::RakeTask.new
+  default_tasks << :steep
+end
+
+task default: default_tasks
diff --git a/Steepfile b/Steepfile
index 6309f26..8eb0ac3 100644
--- a/Steepfile
+++ b/Steepfile
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 # D = Steep::Diagnostic
 target :lib do
diff --git a/bin/console b/bin/console
index fef4850..4fdf31d 100755
--- a/bin/console
+++ b/bin/console
@@ -1,5 +1,6 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'bundler/setup'
 require 'structured_params'
diff --git a/bin/rubocop b/bin/rubocop
new file mode 100755
index 0000000..0ae32c8
--- /dev/null
+++ b/bin/rubocop
@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+# rbs_inline: enabled
+
+# Wrapper script for rubocop that automatically uses the correct config file
+# based on Ruby version
+
+config_file = if RUBY_VERSION >= '3.3.0' && File.exist?('.rubocop_rbs.yml')
+                '.rubocop_rbs.yml'
+              else
+                '.rubocop.yml'
+              end
+
+exec('bundle', 'exec', 'rubocop', '--config', config_file, *ARGV)
diff --git a/lib/structured_params/params.rb b/lib/structured_params/params.rb
index 834e9f1..c8e8b7e 100644
--- a/lib/structured_params/params.rb
+++ b/lib/structured_params/params.rb
@@ -18,7 +18,7 @@ class Params
     # @rbs @errors: ::StructuredParams::Errors?
 
     class << self
-      # @rbs self.@structured_attributes: Hash[Symbol, singleton(::StructuredParams::Params)]?
+      # @rbs @structured_attributes: Hash[Symbol, singleton(::StructuredParams::Params)]?
 
       # Generate permitted parameter structure for Strong Parameters
       #: () -> Array[untyped]
@@ -128,9 +128,7 @@ def validate_structured_parameters
     end
 
     # Validate structured arrays
-    # @rbs attr_name: Symbol
-    # @rbs array_value: Array[untyped]
-    # @rbs return: void
+    #: (Symbol, Array[untyped]) -> void
     def validate_structured_array(attr_name, array_value)
       array_value.each_with_index do |item, index|
         next if item.valid?(validation_context)
@@ -141,9 +139,7 @@ def validate_structured_array(attr_name, array_value)
     end
 
     # Validate structured objects
-    # @rbs attr_name: Symbol
-    # @rbs object_value: ::StructuredParams::Params
-    # @rbs return: void
+    #: (Symbol, StructuredParams::Params) -> void
     def validate_structured_object(attr_name, object_value)
       return if object_value.valid?(validation_context)
 
diff --git a/lib/structured_params/type/object.rb b/lib/structured_params/type/object.rb
index b1d22d4..645f313 100644
--- a/lib/structured_params/type/object.rb
+++ b/lib/structured_params/type/object.rb
@@ -10,6 +10,7 @@ class Object < ActiveModel::Type::Value
       # Get permitted parameter names for use with Strong Parameters
       # @rbs!
       #  def permit_attribute_names: () -> ::Array[untyped]
+
       delegate :permit_attribute_names, to: :value_class
 
       #: (value_class: singleton(StructuredParams::Params), **untyped) -> void
diff --git a/spec/errors_spec.rb b/spec/errors_spec.rb
index a23d234..52640ef 100644
--- a/spec/errors_spec.rb
+++ b/spec/errors_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'spec_helper'
 
diff --git a/spec/factories/address_parameters.rb b/spec/factories/address_parameters.rb
index c7e3127..6cbf531 100644
--- a/spec/factories/address_parameters.rb
+++ b/spec/factories/address_parameters.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class AddressParameter < StructuredParams::Params
   attribute :postal_code, :string
diff --git a/spec/factories/hobby_parameters.rb b/spec/factories/hobby_parameters.rb
index f9c4c3f..4385f5b 100644
--- a/spec/factories/hobby_parameters.rb
+++ b/spec/factories/hobby_parameters.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class HobbyParameter < StructuredParams::Params
   attribute :name, :string
diff --git a/spec/factories/user_parameters.rb b/spec/factories/user_parameters.rb
index 5d27d1f..c234127 100644
--- a/spec/factories/user_parameters.rb
+++ b/spec/factories/user_parameters.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class UserParameter < StructuredParams::Params
   attribute :name, :string
diff --git a/spec/params_spec.rb b/spec/params_spec.rb
index b45cd98..fd06cc3 100644
--- a/spec/params_spec.rb
+++ b/spec/params_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'spec_helper'
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7b65c79..4ef9364 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'structured_params'
 require 'rspec-parameterized'
diff --git a/spec/type/array_spec.rb b/spec/type/array_spec.rb
index 6cd731a..a31473d 100644
--- a/spec/type/array_spec.rb
+++ b/spec/type/array_spec.rb
@@ -1,10 +1,12 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'spec_helper'
 
 RSpec.describe StructuredParams::Type::Array do
   let(:dummy_model_class) do
     Class.new(StructuredParams::Params) do
+      #: () -> String
       def self.name
         'DummyModel'
       end
diff --git a/spec/type/object_spec.rb b/spec/type/object_spec.rb
index 42dde0f..694546b 100644
--- a/spec/type/object_spec.rb
+++ b/spec/type/object_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require 'spec_helper'
 
@@ -7,6 +8,7 @@
 
   let(:dummy_model_class) do
     Class.new(StructuredParams::Params) do
+      #: () -> String
       def self.name
         'DummyModel'
       end
diff --git a/structured_params.gemspec b/structured_params.gemspec
index 5a3672a..82b241c 100644
--- a/structured_params.gemspec
+++ b/structured_params.gemspec
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 require_relative 'lib/structured_params/version'
 
@@ -12,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.description = ''
   spec.homepage = 'https://github.com/Syati/structured_params'
   spec.license = 'MIT'
-  spec.required_ruby_version = '>= 3.0.0'
+  spec.required_ruby_version = '>= 3.2.0'
   spec.require_paths = ['lib']
   spec.files = Dir[
     'LICENSE.txt',