diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 36c20bf..b5ce036 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.0', '3.1', '3.2', '3.3', 'head']
+        ruby-version: ['3.1', '3.2', '3.3', 'head']
 
     steps:
     - uses: actions/checkout@v3
diff --git a/.rubocop.yml b/.rubocop.yml
index 6ca5439..559f6da 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,6 +2,9 @@ require:
   - rubocop-rspec
   - rubocop-performance
 
+AllCops:
+  SuggestExtensions: true
+
 Layout/CaseIndentation:
   Enabled: false
 
@@ -47,15 +50,6 @@ Layout/SpaceInLambdaLiteral:
 Layout/TrailingWhitespace:
   Enabled: false
 
-Lint/AmbiguousBlockAssociation:
-  Enabled: false
-
-Lint/AssignmentInCondition:
-  Enabled: false
-
-Lint/RedundantSplatExpansion:
-  Enabled: false
-
 Metrics/AbcSize:
   Enabled: false
 
@@ -81,10 +75,7 @@ Metrics/ModuleLength:
 Metrics/PerceivedComplexity:
   Max: 10
 
-Naming/FileName:
-  Enabled: false
-
-Naming/MethodParameterName:
+Naming/PredicateName:
   Enabled: false
 
 RSpec/AnyInstance:
@@ -114,6 +105,10 @@ RSpec/LetSetup:
 RSpec/MessageSpies:
   Enabled: false
 
+RSpec/MultipleDescribes:
+  Exclude:
+    - spec/dbf/file_formats_spec.rb
+
 RSpec/MultipleExpectations:
   Enabled: false
 
@@ -123,19 +118,6 @@ RSpec/NestedGroups:
 RSpec/NotToNot:
   EnforcedStyle: to_not
 
-Security/YAMLLoad:
-  Exclude:
-    - app/models/entity.rb
-
-Style/Alias:
-  Enabled: false
-
-Style/AsciiComments:
-  Enabled: false
-
-Style/ClassAndModuleChildren:
-  Enabled: false
-
 Style/Documentation:
   Enabled: false
 
@@ -148,20 +130,8 @@ Style/FormatStringToken:
 Style/FrozenStringLiteralComment:
   Enabled: false
 
-Style/Lambda:
-  Enabled: false
-
 Style/NumericPredicate:
   Enabled: false
 
-Style/PerlBackrefs:
-  Enabled: false
-
-Style/RescueModifier:
-  Enabled: false
-
-Style/SafeNavigation:
-  Enabled: false
-
 Style/SymbolArray:
   EnforcedStyle: brackets
diff --git a/README.md b/README.md
index a5b72a0..716c94a 100644
--- a/README.md
+++ b/README.md
@@ -16,19 +16,19 @@ DBF is a small, fast Ruby library for reading dBase, xBase, Clipper, and FoxPro
   subject line
 * Change log: <https://github.com/infused/dbf/blob/master/CHANGELOG.md>
 
-NOTE: 
+NOTE: Beginning with version 4.3 we have dropped support for Ruby 3.0 and earlier.
 
-NOTE: Beginning with version 4, we have dropped support for Ruby 2.0, 2.1, 2.2, and 2.3. If you need support for these older Rubies,
+NOTE: Beginning with version 4 we have dropped support for Ruby 2.0, 2.1, 2.2, and 2.3. If you need support for these older Rubies,
 please use 3.0.x (<https://github.com/infused.org/dbf/tree/3_stable>)
 
-NOTE: Beginning with version 3, we have dropped support for Ruby 1.8 and 1.9. If you need support for older Rubies,
+NOTE: Beginning with version 3 we have dropped support for Ruby 1.8 and 1.9. If you need support for older Rubies,
 please use 2.0.x (<https://github.com/infused/dbf/tree/2_stable>)
 
 ## Compatibility
 
 DBF is tested to work with the following versions of Ruby:
 
-* Ruby 3.0.x, 3.1.x, 3.2.x, 3.3.x
+* Ruby 3.1.x, 3.2.x, 3.3.x
 
 ## Installation
 
diff --git a/lib/dbf/column.rb b/lib/dbf/column.rb
index 80dbc6e..a18b447 100644
--- a/lib/dbf/column.rb
+++ b/lib/dbf/column.rb
@@ -9,8 +9,10 @@ class NameError < StandardError
     end
 
     attr_reader :table, :name, :type, :length, :decimal
+
     def_delegator :type_cast_class, :type_cast
 
+    # rubocop:disable Style/MutableConstant
     TYPE_CAST_CLASS = {
       N: ColumnType::Number,
       I: ColumnType::SignedLong,
@@ -24,6 +26,7 @@ class NameError < StandardError
       G: ColumnType::General,
       '+'.to_sym => ColumnType::SignedLong2
     }
+    # rubocop:enable Style/MutableConstant
     TYPE_CAST_CLASS.default = ColumnType::String
     TYPE_CAST_CLASS.freeze
 
@@ -58,7 +61,7 @@ def memo?
     #
     # @return [Hash]
     def to_hash
-      {name: name, type: type, length: length, decimal: decimal}
+      {name:, type:, length:, decimal:}
     end
 
     # Underscored name
@@ -68,18 +71,17 @@ def to_hash
     #
     # @return [String]
     def underscored_name
-      @underscored_name ||= begin
-        name.gsub(/([a-z\d])([A-Z])/, '\1_\2').tr('-', '_').downcase
-      end
+      @underscored_name ||= name.gsub(/([a-z\d])([A-Z])/, '\1_\2').tr('-', '_').downcase
+      
     end
 
     private
 
     def clean(value) # :nodoc:
-      value.strip.gsub("\x00", '').gsub(/[^\x20-\x7E]/, '')
+      value.strip.delete("\x00").gsub(/[^\x20-\x7E]/, '')
     end
 
-    def encode(value, strip_output = false) # :nodoc:
+    def encode(value, strip_output: false) # :nodoc:
       return value unless value.respond_to?(:encoding)
 
       output = @encoding ? encode_string(value) : value
diff --git a/lib/dbf/database/foxpro.rb b/lib/dbf/database/foxpro.rb
index fcc65c3..b2e1476 100644
--- a/lib/dbf/database/foxpro.rb
+++ b/lib/dbf/database/foxpro.rb
@@ -105,7 +105,7 @@ def process_field(record, data)
       end
 
       def table_field_hash(name)
-        {name: name, fields: []}
+        {name:, fields: []}
       end
     end
 
diff --git a/lib/dbf/header.rb b/lib/dbf/header.rb
index 968debb..1b55d5f 100644
--- a/lib/dbf/header.rb
+++ b/lib/dbf/header.rb
@@ -1,11 +1,6 @@
 module DBF
   class Header
-    attr_reader :version
-    attr_reader :record_count
-    attr_reader :header_length
-    attr_reader :record_length
-    attr_reader :encoding_key
-    attr_reader :encoding
+    attr_reader :version, :record_count, :header_length, :record_length, :encoding_key, :encoding
 
     def initialize(data)
       @data = data
@@ -13,7 +8,7 @@ def initialize(data)
     end
 
     def unpack_header
-      @version = @data.unpack('H2').first
+      @version = @data.unpack1('H2')
 
       case @version
       when '02'
diff --git a/lib/dbf/record.rb b/lib/dbf/record.rb
index b7430b1..936b07b 100644
--- a/lib/dbf/record.rb
+++ b/lib/dbf/record.rb
@@ -29,7 +29,7 @@ def [](name)
       key = name.to_s
       if attributes.key?(key)
         attributes[key]
-      elsif index = underscored_column_names.index(key)
+      elsif (index = underscored_column_names.index(key))
         attributes[@columns[index].name]
       end
     end
@@ -59,7 +59,7 @@ def to_a
     private
 
     def column_names # :nodoc:
-      @column_names ||= @columns.map { |column| column.name }
+      @column_names ||= @columns.map(&:name)
     end
 
     def get_data(column) # :nodoc:
diff --git a/lib/dbf/schema.rb b/lib/dbf/schema.rb
index 7f67462..077a2de 100644
--- a/lib/dbf/schema.rb
+++ b/lib/dbf/schema.rb
@@ -35,9 +35,9 @@ module Schema
     # @param format [Symbol] format Valid options are :activerecord and :json
     # @param table_only [Boolean]
     # @return [String]
-    def schema(format = :activerecord, table_only = false)
+    def schema(format = :activerecord, table_only: false)
       schema_method_name = schema_name(format)
-      send(schema_method_name, table_only)
+      send(schema_method_name, table_only:)
     rescue NameError
       raise ArgumentError, ":#{format} is not a valid schema. Valid schemas are: #{FORMATS.join(', ')}."
     end
@@ -46,7 +46,7 @@ def schema_name(format) # :nodoc:
       "#{format}_schema"
     end
 
-    def activerecord_schema(_table_only = false) # :nodoc:
+    def activerecord_schema(*) # :nodoc:
       s = "ActiveRecord::Schema.define do\n"
       s << "  create_table \"#{name}\" do |t|\n"
       columns.each do |column|
@@ -56,7 +56,7 @@ def activerecord_schema(_table_only = false) # :nodoc:
       s
     end
 
-    def sequel_schema(table_only = false) # :nodoc:
+    def sequel_schema(table_only: false) # :nodoc:
       s = ''
       s << "Sequel.migration do\n" unless table_only
       s << "  change do\n " unless table_only
@@ -70,7 +70,7 @@ def sequel_schema(table_only = false) # :nodoc:
       s
     end
 
-    def json_schema(_table_only = false) # :nodoc:
+    def json_schema(*) # :nodoc:
       columns.map(&:to_hash).to_json
     end
 
@@ -92,9 +92,9 @@ def sequel_schema_definition(column)
 
     def schema_data_type(column, format = :activerecord) # :nodoc:
       case column.type
-      when *%w[N F I]
+      when 'N', 'F', 'I'
         number_data_type(column)
-      when *%w[Y D T L M B]
+      when 'Y', 'D', 'T', 'L', 'M', 'B'
         OTHER_DATA_TYPES[column.type]
       else
         string_data_format(format, column)
diff --git a/lib/dbf/table.rb b/lib/dbf/table.rb
index bafe693..7f7f0ed 100644
--- a/lib/dbf/table.rb
+++ b/lib/dbf/table.rb
@@ -86,7 +86,7 @@ def initialize(data, memo = nil, encoding = nil)
     # @return [TrueClass, FalseClass]
     def close
       @data.close
-      @memo && @memo.close
+      @memo&.close
     end
 
     # @return [TrueClass, FalseClass]
@@ -255,7 +255,7 @@ def end_of_record? # :nodoc:
 
     def find_all(options) # :nodoc:
       select do |record|
-        next unless record && record.match?(options)
+        next unless record&.match?(options)
 
         yield record if block_given?
         record
@@ -263,7 +263,7 @@ def find_all(options) # :nodoc:
     end
 
     def find_first(options) # :nodoc:
-      detect { |record| record && record.match?(options) }
+      detect { |record| record&.match?(options) }
     end
 
     def foxpro? # :nodoc:
@@ -278,13 +278,12 @@ def header # :nodoc:
     end
 
     def memo_class # :nodoc:
-      @memo_class ||= begin
-        if foxpro?
-          Memo::Foxpro
+      @memo_class ||= if foxpro?
+        Memo::Foxpro
         else
           version == '83' ? Memo::Dbase3 : Memo::Dbase4
-        end
       end
+      
     end
 
     def memo_search_path(io) # :nodoc:
diff --git a/spec/dbf/record_spec.rb b/spec/dbf/record_spec.rb
index 382c198..3b3648d 100644
--- a/spec/dbf/record_spec.rb
+++ b/spec/dbf/record_spec.rb
@@ -3,25 +3,25 @@
 RSpec.describe DBF::Record do
   describe '#to_a' do
     let(:table) { DBF::Table.new fixture('dbase_83.dbf') }
-    let(:record_0) { YAML.load_file(fixture('dbase_83_record_0.yml')) }
-    let(:record_9) { YAML.load_file(fixture('dbase_83_record_9.yml')) }
+    let(:record0) { YAML.load_file(fixture('dbase_83_record_0.yml')) }
+    let(:record9) { YAML.load_file(fixture('dbase_83_record_9.yml')) }
 
     it 'returns an ordered array of attribute values' do
       record = table.record(0)
-      expect(record.to_a).to eq record_0
+      expect(record.to_a).to eq record0
 
       record = table.record(9)
-      expect(record.to_a).to eq record_9
+      expect(record.to_a).to eq record9
     end
 
     describe 'with missing memo file' do
       describe 'when opening a path' do
         let(:table) { DBF::Table.new fixture('dbase_83_missing_memo.dbf') }
-        let(:record_0) { YAML.load_file(fixture('dbase_83_missing_memo_record_0.yml')) }
+        let(:record0) { YAML.load_file(fixture('dbase_83_missing_memo_record_0.yml')) }
 
         it 'returns nil values for memo fields' do
           record = table.record(0)
-          expect(record.to_a).to eq record_0
+          expect(record.to_a).to eq record0
         end
       end
     end
@@ -29,11 +29,11 @@
     describe 'when opening StringIO' do
       let(:data) { StringIO.new(File.read(fixture('dbase_83_missing_memo.dbf'))) }
       let(:table) { DBF::Table.new(data) }
-      let(:record_0) { YAML.load_file(fixture('dbase_83_missing_memo_record_0.yml')) }
+      let(:record0) { YAML.load_file(fixture('dbase_83_missing_memo_record_0.yml')) }
 
       it 'returns nil values for memo fields' do
         record = table.record(0)
-        expect(record.to_a).to eq record_0
+        expect(record.to_a).to eq record0
       end
     end
   end
@@ -50,7 +50,7 @@
 
     describe 'if other attributes match' do
       let(:attributes) { {x: 1, y: 2} }
-      let(:other) { instance_double('DBF::Record', attributes: attributes) }
+      let(:other) { instance_double('DBF::Record', attributes:) }
 
       before do
         allow(record).to receive(:attributes).and_return(attributes)
diff --git a/spec/dbf/table_spec.rb b/spec/dbf/table_spec.rb
index 7d93c19..1c65dd2 100644
--- a/spec/dbf/table_spec.rb
+++ b/spec/dbf/table_spec.rb
@@ -70,7 +70,6 @@
 
     describe 'when data is StringIO' do
       let(:data) { StringIO.new File.read(dbf_path) }
-      let(:memo) { StringIO.new File.read(memo_path) }
       let(:table) { DBF::Table.new data }
 
       let(:control_schema) { File.read(fixture('dbase_83_schema_ar.txt')) }
@@ -200,7 +199,7 @@
       end
 
       it 'returns matching records when used with options' do
-        expect(table.find(:all, 'WEIGHT' => 0.0)).to eq table.select { |r| r['weight'] == 0.0 }
+        expect(table.find(:all, 'WEIGHT' => 0.0)).to eq(table.select { |r| r['weight'] == 0.0 })
       end
 
       it 'ANDS multiple search terms' do
@@ -295,7 +294,7 @@
     it 'is an array of Columns' do
       expect(columns).to be_an(Array)
       expect(columns).to_not be_empty
-      expect(columns).to be_all { |c| c.is_a? DBF::Column }
+      expect(columns).to(be_all { |c| c.is_a? DBF::Column })
     end
   end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 1260727..9cabf2d 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,6 +2,7 @@
   require 'simplecov'
   SimpleCov.start
 rescue LoadError
+  # ignore
 end
 
 require 'dbf'