diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f6a2976..396265b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2', '3.1', '3.0', '2.7']
+        ruby: ['3.2', '3.1', '3.0']
         frozen_string_literal: ['yes', 'no']
 
     env:
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 6712300..ce269a9 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -39,7 +39,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.7'
+          ruby-version: '3.0'
           bundler-cache: true
         env:
           BUNDLE_WITHOUT: rggen:test
diff --git a/lib/rggen/core/facets.rb b/lib/rggen/core/facets.rb
index 892627b..c503ce7 100644
--- a/lib/rggen/core/facets.rb
+++ b/lib/rggen/core/facets.rb
@@ -2,7 +2,6 @@
 
 require 'facets/array/merge'
 require 'facets/file/ext'
-require 'facets/hash/except' if RUBY_VERSION < '3.0.0'
 require 'facets/kernel/blank'
 require 'facets/pathname/to_path'
 require 'facets/module/attr_setter'
diff --git a/lib/rggen/core/input_base/feature.rb b/lib/rggen/core/input_base/feature.rb
index ac9a546..5ddf7d6 100644
--- a/lib/rggen/core/input_base/feature.rb
+++ b/lib/rggen/core/input_base/feature.rb
@@ -9,8 +9,8 @@ class Feature < Base::Feature
         include ConversionUtility
 
         class << self
-          def property(name, **options, &body)
-            Property.define(self, name, **options, &body)
+          def property(name, ...)
+            Property.define(self, name, ...)
             properties.include?(name) || properties << name
           end
 
@@ -49,8 +49,8 @@ def passive_feature?
             builders.nil?
           end
 
-          def input_pattern(pattern_or_patterns, **options, &converter)
-            @input_matcher = InputMatcher.new(pattern_or_patterns, **options, &converter)
+          def input_pattern(pattern_or_patterns, ...)
+            @input_matcher = InputMatcher.new(pattern_or_patterns, ...)
           end
 
           attr_reader :input_matcher
diff --git a/lib/rggen/core/input_base/input_data.rb b/lib/rggen/core/input_base/input_data.rb
index 9692085..375151f 100644
--- a/lib/rggen/core/input_base/input_data.rb
+++ b/lib/rggen/core/input_base/input_data.rb
@@ -87,8 +87,8 @@ def include_docile_path?(caller_location)
           caller_location.path.include?('docile')
         end
 
-        def create_child_data(layer, *args, &block)
-          child_data_class.new(layer, @valid_value_lists, *args, &block)
+        def create_child_data(layer, ...)
+          child_data_class.new(layer, @valid_value_lists, ...)
         end
 
         def child_data_class
diff --git a/lib/rggen/core/input_base/input_matcher.rb b/lib/rggen/core/input_base/input_matcher.rb
index b7cc41d..432465f 100644
--- a/lib/rggen/core/input_base/input_matcher.rb
+++ b/lib/rggen/core/input_base/input_matcher.rb
@@ -52,7 +52,7 @@ def ignore_blanks?
             /(?<=[[:punct:]&&[^_]])[[:blank:]]+(?=\w)/
           ).freeze
 
-        COMPRESS_BLANK_PATTERN = /[[:blank:]]+/.freeze
+        COMPRESS_BLANK_PATTERN = /[[:blank:]]+/
 
         def delete_blanks(rhs)
           rhs
diff --git a/lib/rggen/core/input_base/property.rb b/lib/rggen/core/input_base/property.rb
index 178942d..51d2407 100644
--- a/lib/rggen/core/input_base/property.rb
+++ b/lib/rggen/core/input_base/property.rb
@@ -23,16 +23,16 @@ def initialize(name, options, &body)
 
         def define(feature)
           feature.class_exec(self) do |property|
-            define_method(property.name) do |*args, **keywords, &block|
-              property.evaluate(self, *args, **keywords, &block)
+            define_method(property.name) do |*args, **kwargs, &block|
+              property.evaluate(self, *args, **kwargs, &block)
             end
           end
         end
 
-        def evaluate(feature, *args, **keywords, &block)
+        def evaluate(feature, ...)
           feature.verify(@options[:verify]) if @options.key?(:verify)
           if proxy_property?
-            proxy_property(feature, *args, **keywords, &block)
+            proxy_property(feature, ...)
           else
             default_property(feature)
           end
@@ -55,7 +55,7 @@ def proxy_property?
           ].any?
         end
 
-        def proxy_property(feature, *args, **keywords, &block)
+        def proxy_property(feature, ...)
           receiver, method =
             if @costom_property
               [@costom_property.bind(feature), :call]
@@ -64,7 +64,7 @@ def proxy_property(feature, *args, **keywords, &block)
             else
               [feature, @options[:forward_to]]
             end
-          receiver.__send__(method, *args, **keywords, &block)
+          receiver.__send__(method, ...)
         end
 
         def default_property(feature)
diff --git a/lib/rggen/core/utility/regexp_patterns.rb b/lib/rggen/core/utility/regexp_patterns.rb
index fdfc29a..b955154 100644
--- a/lib/rggen/core/utility/regexp_patterns.rb
+++ b/lib/rggen/core/utility/regexp_patterns.rb
@@ -12,17 +12,17 @@ def included(klass)
 
         private
 
-        VARIABLE_NAME_PATTERN = /[a-z_]\w*/i.freeze
+        VARIABLE_NAME_PATTERN = /[a-z_]\w*/i
 
         def variable_name
           VARIABLE_NAME_PATTERN
         end
 
-        BINARY_PATTERN = /[+-]?0b[01](?:_?[01])*/i.freeze
+        BINARY_PATTERN = /[+-]?0b[01](?:_?[01])*/i
 
-        DECIMAL_PATTERN = /[+-]?(?:[1-9]_?(?:\d_?)*)?\d/.freeze
+        DECIMAL_PATTERN = /[+-]?(?:[1-9]_?(?:\d_?)*)?\d/
 
-        HEXADECIMAL_PATTERN = /[+-]?0x\h(?:_?\h)*/i.freeze
+        HEXADECIMAL_PATTERN = /[+-]?0x\h(?:_?\h)*/i
 
         INTEGER_PATTERN =
           Regexp.union(
@@ -33,13 +33,13 @@ def integer
           INTEGER_PATTERN
         end
 
-        TRUTHY_PATTERN = /true|on|yes/i.freeze
+        TRUTHY_PATTERN = /true|on|yes/i
 
         def truthy_pattern
           TRUTHY_PATTERN
         end
 
-        FALSEY_PATTERN = /false|off|no/i.freeze
+        FALSEY_PATTERN = /false|off|no/i
 
         def falsey_pattern
           FALSEY_PATTERN
diff --git a/rggen-core.gemspec b/rggen-core.gemspec
index 0128fb6..a9b9621 100644
--- a/rggen-core.gemspec
+++ b/rggen-core.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(/^exe\//) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.7'
+  spec.required_ruby_version = '>= 3.0'
 
   spec.add_runtime_dependency 'docile', '>= 1.1.5', '!= 1.3.3'
   spec.add_runtime_dependency 'erubi', '>= 1.7'