diff --git a/.rubocop.yml b/.rubocop.yml
index 3dec5c25..5f3b3092 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,6 @@
 # We chose not to make these changes
 inherit_from:
+  - .rubocop_gemspec.yml
   - .rubocop_performance.yml
   - .rubocop_rspec.yml
   - .rubocop_thread_safety.yml
@@ -17,6 +18,7 @@ require:
 AllCops:
   DisplayCopNames: true # Display the name of the failing cops
   TargetRubyVersion: 2.3
+  NewCops: enable
 
 # It's a matter of taste
 Layout/ParameterAlignment:
@@ -100,3 +102,10 @@ Naming/PredicateName:
 Security/YAMLLoad:
   Enabled: false
 
+Lint/EmptyClass:
+  Exclude:
+    - README.md
+Lint/EmptyBlock:
+  Exclude:
+    - README.md
+
diff --git a/.rubocop_gemspec.yml b/.rubocop_gemspec.yml
new file mode 100644
index 00000000..bcdcb697
--- /dev/null
+++ b/.rubocop_gemspec.yml
@@ -0,0 +1,9 @@
+# specifying Ruby version would be a breaking change
+# we may consider adding `required_ruby_version` in the next major release
+Gemspec/RequiredRubyVersion:
+  Enabled: false
+
+# development dependencies specified in the gemspec file are shared
+# by the main Gemfile and gemfiles in the gemfiles/ directory that are used on CI
+Gemspec/DevelopmentDependencies:
+  Enabled: false
diff --git a/.rubocop_performance.yml b/.rubocop_performance.yml
index b65f167e..5ef13e72 100644
--- a/.rubocop_performance.yml
+++ b/.rubocop_performance.yml
@@ -1,3 +1,6 @@
 # See: https://github.com/rubocop/rubocop-performance/issues/322
 Performance/RegexpMatch:
   Enabled: false
+
+Performance/MethodObjectAsBlock:
+  Enabled: false
diff --git a/.rubocop_rspec.yml b/.rubocop_rspec.yml
index 079933da..7c1f669c 100644
--- a/.rubocop_rspec.yml
+++ b/.rubocop_rspec.yml
@@ -4,6 +4,9 @@ RSpec/FilePath:
 RSpec/MultipleExpectations:
   Enabled: false
 
+RSpec/MultipleMemoizedHelpers:
+  Enabled: false
+
 RSpec/NamedSubject:
   Enabled: false
 
@@ -21,7 +24,7 @@ RSpec/InstanceVariable:
 
 RSpec/NestedGroups:
   Enabled: false
-  
+
 RSpec/ExpectInHook:
   Enabled: false
 
@@ -30,3 +33,12 @@ RSpec/ExpectInHook:
 #            got #<BigDecimal:...> => 101.0 (0.101e3)
 RSpec/BeEql:
   Enabled: false
+
+RSpec/BeEq:
+  Enabled: false
+
+RSpec/StubbedMock:
+  Enabled: false
+
+RSpec/IndexedLet:
+  Enabled: false
diff --git a/lib/dynamoid/adapter_plugin/aws_sdk_v3.rb b/lib/dynamoid/adapter_plugin/aws_sdk_v3.rb
index 8bb51ad5..65b08454 100644
--- a/lib/dynamoid/adapter_plugin/aws_sdk_v3.rb
+++ b/lib/dynamoid/adapter_plugin/aws_sdk_v3.rb
@@ -46,6 +46,7 @@ class AwsSdkV3
       CONNECTION_CONFIG_OPTIONS = %i[endpoint region http_continue_timeout http_idle_timeout http_open_timeout http_read_timeout].freeze
 
       # See https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ReservedWords.html
+      # rubocop:disable Metrics/CollectionLiteralLength
       RESERVED_WORDS = Set.new(
         %i[
           ABORT ABSOLUTE ACTION ADD AFTER AGENT AGGREGATE ALL ALLOCATE ALTER ANALYZE
@@ -107,6 +108,7 @@ class AwsSdkV3
           WHILE WINDOW WITH WITHIN WITHOUT WORK WRAPPED WRITE YEAR ZONE
         ]
       ).freeze
+      # rubocop:enable Metrics/CollectionLiteralLength
 
       attr_reader :table_cache
 
diff --git a/lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb b/lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb
index d30a5247..b9b6a248 100644
--- a/lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb
+++ b/lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb
@@ -102,6 +102,7 @@ def attribute_updates
         # The only difference is that to update item we need to track whether
         # attribute value is nil or not.
         def sanitize_attributes(attributes)
+          # rubocop:disable Lint/DuplicateBranch
           attributes.transform_values do |v|
             if v.is_a?(Hash)
               v.stringify_keys
@@ -113,6 +114,7 @@ def sanitize_attributes(attributes)
               v
             end
           end
+          # rubocop:enable Lint/DuplicateBranch
         end
       end
     end
diff --git a/lib/dynamoid/type_casting.rb b/lib/dynamoid/type_casting.rb
index dd11c74b..7217e274 100644
--- a/lib/dynamoid/type_casting.rb
+++ b/lib/dynamoid/type_casting.rb
@@ -72,6 +72,7 @@ def process(value)
 
     class IntegerTypeCaster < Base
       def process(value)
+        # rubocop:disable Lint/DuplicateBranch
         if value == true
           1
         elsif value == false
@@ -85,11 +86,13 @@ def process(value)
         else
           value.to_i
         end
+        # rubocop:enable Lint/DuplicateBranch
       end
     end
 
     class NumberTypeCaster < Base
       def process(value)
+        # rubocop:disable Lint/DuplicateBranch
         if value == true
           1
         elsif value == false
@@ -105,6 +108,7 @@ def process(value)
         else
           value.to_d
         end
+        # rubocop:enable Lint/DuplicateBranch
       end
     end
 
diff --git a/spec/dynamoid/criteria/chain_spec.rb b/spec/dynamoid/criteria/chain_spec.rb
index 448f39de..d611ea9f 100644
--- a/spec/dynamoid/criteria/chain_spec.rb
+++ b/spec/dynamoid/criteria/chain_spec.rb
@@ -1210,6 +1210,7 @@ def request_params
     # https://github.com/Dynamoid/dynamoid/issues/435
     context 'when inheritance field (:type by default) is a GSI hash key' do
       it 'works without exception' do
+        # rubocop:disable Lint/ConstantDefinitionInBlock
         UserWithGSI = new_class class_name: 'UserWithGSI' do
           field :type
 
@@ -1217,6 +1218,8 @@ def request_params
                                  range_key: :created_at,
                                  projected_attributes: :all
         end
+        # rubocop:enable Lint/ConstantDefinitionInBlock
+
         obj = UserWithGSI.create
 
         actual = UserWithGSI.where(type: 'UserWithGSI').all.to_a
@@ -1302,7 +1305,7 @@ def request_params
         object = klass_with_callback.create!(name: 'Alex')
 
         expect do
-          klass_with_callback.where(name: 'Alex').find_by_pages { |*| }
+          klass_with_callback.where(name: 'Alex').find_by_pages { |*| } # rubocop:disable Lint/EmptyBlock
         end.to output('run after_initialize').to_stdout
       end
 
@@ -1315,7 +1318,7 @@ def request_params
         object = klass_with_callback.create!(name: 'Alex')
 
         expect do
-          klass_with_callback.where(name: 'Alex').find_by_pages { |*| }
+          klass_with_callback.where(name: 'Alex').find_by_pages { |*| } # rubocop:disable Lint/EmptyBlock
         end.to output('run after_find').to_stdout
       end
 
@@ -1329,7 +1332,7 @@ def request_params
         object = klass_with_callback.create!(name: 'Alex')
 
         expect do
-          klass_with_callback.where(name: 'Alex').find_by_pages { |*| }
+          klass_with_callback.where(name: 'Alex').find_by_pages { |*| } # rubocop:disable Lint/EmptyBlock
         end.to output('run after_initializerun after_find').to_stdout
       end
     end
diff --git a/spec/dynamoid/document_spec.rb b/spec/dynamoid/document_spec.rb
index 5f585863..9cf992df 100644
--- a/spec/dynamoid/document_spec.rb
+++ b/spec/dynamoid/document_spec.rb
@@ -240,7 +240,7 @@ def city=(value)
 
   shared_examples 'it has equality testing and hashing' do
     it 'is equal to itself' do
-      expect(document).to eq document
+      expect(document).to eq document # rubocop:disable RSpec/IdenticalEqualityAssertion
     end
 
     it 'is equal to another document with the same key(s)' do
diff --git a/spec/dynamoid/fields_spec.rb b/spec/dynamoid/fields_spec.rb
index 29c4d01f..7ad302b8 100644
--- a/spec/dynamoid/fields_spec.rb
+++ b/spec/dynamoid/fields_spec.rb
@@ -129,7 +129,7 @@ def foobar_before_type_cast?; end
     expect(address.city).to eq 'Chicago'
   end
 
-  it 'declares a query attribute' do
+  it 'declares a query attribute' do # rubocop:disable Lint/EmptyBlock, RSpec/NoExpectationExample
   end
 
   it 'automatically declares id' do
diff --git a/spec/dynamoid/indexes_spec.rb b/spec/dynamoid/indexes_spec.rb
index d3081839..25849cfd 100644
--- a/spec/dynamoid/indexes_spec.rb
+++ b/spec/dynamoid/indexes_spec.rb
@@ -378,6 +378,7 @@
         context 'with custom type key params' do
           let(:doc_class) do
             new_class do
+              # rubocop:disable Lint/ConstantDefinitionInBlock
               class CustomType
                 def dynamoid_dump
                   name
@@ -387,6 +388,7 @@ def self.dynamoid_load(string)
                   new(string.to_s)
                 end
               end
+              # rubocop:enable Lint/ConstantDefinitionInBlock
 
               field :custom_type_field, CustomType
               field :custom_type_range_field, CustomType
diff --git a/spec/dynamoid/persistence_spec.rb b/spec/dynamoid/persistence_spec.rb
index e101c650..f1e4d6ea 100644
--- a/spec/dynamoid/persistence_spec.rb
+++ b/spec/dynamoid/persistence_spec.rb
@@ -868,7 +868,7 @@ def around_save_callback
         end
 
         # print each message on new line to force RSpec to show meaningful diff
-        expected_output = [
+        expected_output = [ # rubocop:disable Style/StringConcatenation
           'run before_validation',
           'run after_validation',
           'run before_save',
@@ -1336,7 +1336,7 @@ def around_update_callback
         end
 
         # print each message on new line to force RSpec to show meaningful diff
-        expected_output = [
+        expected_output = [ # rubocop:disable Style/StringConcatenation
           'run before_validation',
           'run after_validation',
           'run before_save',
@@ -2583,7 +2583,7 @@ def around_save_callback
           obj = klass_with_callbacks.new(name: 'Alex')
 
           # print each message on new line to force RSpec to show meaningful diff
-          expected_output = [
+          expected_output = [ # rubocop:disable Style/StringConcatenation
             'run before_validation',
             'run after_validation',
             'run before_save',
@@ -2670,7 +2670,7 @@ def around_save_callback
           end
 
           # print each message on new line to force RSpec to show meaningful diff
-          expected_output = [
+          expected_output = [ # rubocop:disable Style/StringConcatenation
             'run before_validation',
             'run after_validation',
             'run before_save',
@@ -2887,7 +2887,7 @@ def around_save_callback
 
         it 'does not change updated_at if attributes were assigned the same values' do
           obj = klass.create(title: 'Old title', updated_at: Time.now - 1)
-          obj.title = obj.title
+          obj.title = obj.title # rubocop:disable Lint/SelfAssignment
 
           expect { obj.save }.not_to change { obj.updated_at }
         end
@@ -3100,7 +3100,7 @@ def around_save_callback
 
       it 'does not change updated_at if attributes were assigned the same values' do
         obj = klass.create(title: 'Old title', updated_at: Time.now - 1)
-        obj.title = obj.title
+        obj.title = obj.title # rubocop:disable Lint/SelfAssignment
 
         expect do
           obj.update_attribute(:title, 'Old title')
@@ -3282,7 +3282,7 @@ def around_update_callback
         end
 
         # print each message on new line to force RSpec to show meaningful diff
-        expected_output = [
+        expected_output = [ # rubocop:disable Style/StringConcatenation
           'run before_save',
           'start around_save',
           'run before_update',
@@ -3395,7 +3395,7 @@ def around_update_callback
 
       it 'does not change updated_at if attributes were assigned the same values' do
         obj = klass.create(title: 'Old title', updated_at: Time.now - 1)
-        obj.title = obj.title
+        obj.title = obj.title # rubocop:disable Lint/SelfAssignment
 
         expect do
           obj.update_attributes(title: 'Old title')
@@ -3586,7 +3586,7 @@ def around_update_callback
 
       it 'does not change updated_at if attributes were assigned the same values' do
         obj = klass.create(title: 'Old title', updated_at: Time.now - 1)
-        obj.title = obj.title
+        obj.title = obj.title # rubocop:disable Lint/SelfAssignment
 
         expect do
           obj.update_attributes!(title: 'Old title')
@@ -3758,7 +3758,7 @@ def around_update_callback
         end
 
         # print each message on new line to force RSpec to show meaningful diff
-        expected_output = [
+        expected_output = [ # rubocop:disable Style/StringConcatenation
           'run before_validation',
           'run after_validation',
           'run before_save',
@@ -4535,7 +4535,7 @@ def around_update_callback
         end
 
         # print each message on new line to force RSpec to show meaningful diff
-        expected_output = [
+        expected_output = [ # rubocop:disable Style/StringConcatenation
           'run before_update',
           'start around_update',
           'finish around_update',
diff --git a/spec/dynamoid/sti_spec.rb b/spec/dynamoid/sti_spec.rb
index 3220209a..77467502 100644
--- a/spec/dynamoid/sti_spec.rb
+++ b/spec/dynamoid/sti_spec.rb
@@ -47,6 +47,7 @@
 
   describe 'persistence' do
     before do
+      # rubocop:disable Lint/ConstantDefinitionInBlock
       A = new_class class_name: 'A' do
         field :type
       end
@@ -65,6 +66,7 @@ def self.name
           'D'
         end
       end
+      # rubocop:enable Lint/ConstantDefinitionInBlock
     end
 
     after do
@@ -125,6 +127,7 @@ def self.name
 
   describe '`inheritance_field` document option' do
     before do
+      # rubocop:disable Lint/ConstantDefinitionInBlock
       A = new_class class_name: 'A' do
         table inheritance_field: :type_new
 
@@ -137,6 +140,7 @@ def self.name
           'B'
         end
       end
+      # rubocop:enable Lint/ConstantDefinitionInBlock
     end
 
     after do
@@ -163,6 +167,7 @@ def self.name
 
   describe '`sti_name` support' do
     before do
+      # rubocop:disable Lint/ConstantDefinitionInBlock
       A = new_class class_name: 'A' do
         field :type
 
@@ -178,6 +183,7 @@ def self.sti_name
           'beta'
         end
       end
+      # rubocop:enable Lint/ConstantDefinitionInBlock
     end
 
     after do
@@ -194,9 +200,11 @@ def self.sti_name
 
   describe 'sti_class_for' do
     before do
+      # rubocop:disable Lint/ConstantDefinitionInBlock
       A = new_class class_name: 'A' do
         field :type
       end
+      # rubocop:enable Lint/ConstantDefinitionInBlock
     end
 
     after do
diff --git a/spec/dynamoid/type_casting_spec.rb b/spec/dynamoid/type_casting_spec.rb
index b64e3f79..38b91a82 100644
--- a/spec/dynamoid/type_casting_spec.rb
+++ b/spec/dynamoid/type_casting_spec.rb
@@ -445,7 +445,7 @@
     end
   end
 
-  describe 'Raw field' do
+  describe 'Raw field' do # rubocop:disable Lint/EmptyBlock
   end
 
   describe 'Map field' do
@@ -680,10 +680,10 @@ def settings.to_hash
     end
   end
 
-  describe 'Serialized field' do
+  describe 'Serialized field' do # rubocop:disable Lint/EmptyBlock
   end
 
-  describe 'Custom type field' do
+  describe 'Custom type field' do # rubocop:disable Lint/EmptyBlock
   end
 
   context 'there is no such field' do