diff --git a/.github/workflows/danger.yml b/.github/workflows/danger.yml
new file mode 100644
index 0000000000..681f52b46e
--- /dev/null
+++ b/.github/workflows/danger.yml
@@ -0,0 +1,19 @@
+---
+name: Danger
+on:
+  pull_request:
+    ypes: [opened, reopened, edited, synchronize]
+jobs:
+  danger:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.6
+        bundler-cache: true
+    - name: Run Danger
+      run: bundle exec danger
+      env:
+        DANGER_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000000..8782c8247d
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,80 @@
+---
+name: test
+on:
+  push:
+    branches:
+      - "*"
+  pull_request:
+    branches:
+      - "*"
+jobs:
+  lint:
+    name: RuboCop
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.7
+        bundler-cache: true
+    - name: Run RuboCop
+      run: bundle exec rubocop
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - 2.5
+          - 2.6
+          - 2.7
+        gemfile:
+          - Gemfile
+          - gemfiles/rack1.gemfile
+          - gemfiles/rack2.gemfile
+          - gemfiles/rack_edge.gemfile
+          - gemfiles/rails_edge.gemfile
+          - gemfiles/rails_5.gemfile
+          - gemfiles/rails_6.gemfile
+        experimental: [false]
+        include:
+          - ruby: 2.7
+            gemfile: 'gemfiles/multi_json.gemfile'
+            experimental: false
+          - ruby: 2.7
+            gemfile: 'gemfiles/multi_xml.gemfile'
+            experimental: false
+          - ruby: "ruby-head"
+            experimental: true
+          - ruby: "truffleruby-head"
+            experimental: true
+          - ruby: "jruby-head"
+            experimental: true
+    runs-on: ubuntu-20.04
+    continue-on-error: ${{ matrix.experimental }}
+    env:
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+
+    - name: Run tests
+      run: bundle exec rake spec
+    
+    - name: Run tests (spec/integration/eager_load)
+      if: ${{ matrix.gemfile == 'Gemfile' }}
+      run: bundle exec rspec spec/integration/eager_load
+
+    - name: Run tests (spec/integration/multi_json)
+      if: ${{ matrix.gemfile == 'gemfiles/multi_json.gemfile' }}
+      run: bundle exec rspec spec/integration/multi_json
+   
+    - name: Run tests (spec/integration/multi_xml)
+      if: ${{ matrix.gemfile == 'gemfiles/multi_xml.gemfile' }}
+      run: bundle exec rspec spec/integration/multi_xml
diff --git a/.rubocop.yml b/.rubocop.yml
index e03c5ca662..ee4a91c64d 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,6 +1,7 @@
 AllCops:
   NewCops: enable
   TargetRubyVersion: 2.4
+  SuggestExtensions: false
   Exclude:
     - vendor/**/*
     - bin/**/*
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 84b9fc45bc..4320b39374 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,12 +1,12 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2020-09-30 12:54:06 -0400 using RuboCop version 0.84.0.
+# on 2020-12-26 22:10:33 UTC using RuboCop version 1.7.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 6
+# Offense count: 5
 # Cop supports --auto-correct.
 Layout/ClosingHeredocIndentation:
   Exclude:
@@ -18,6 +18,22 @@ Layout/ClosingHeredocIndentation:
 Layout/EmptyLineAfterGuardClause:
   Enabled: false
 
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: EmptyLineBetweenMethodDefs, EmptyLineBetweenClassDefs, EmptyLineBetweenModuleDefs, AllowAdjacentOneLineDefs, NumberOfEmptyLines.
+Layout/EmptyLineBetweenDefs:
+  Exclude:
+    - 'spec/grape/api_spec.rb'
+    - 'spec/grape/middleware/stack_spec.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, IndentationWidth.
+# SupportedStyles: special_inside_parentheses, consistent, align_brackets
+Layout/FirstArrayElementIndentation:
+  Exclude:
+    - 'spec/grape/validations_spec.rb'
+
 # Offense count: 27
 # Cop supports --auto-correct.
 # Configuration parameters: AllowMultipleStyles, EnforcedHashRocketStyle, EnforcedColonStyle, EnforcedLastArgumentHashStyle.
@@ -34,19 +50,90 @@ Layout/HashAlignment:
 
 # Offense count: 7
 # Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: squiggly, active_support, powerpack, unindent
 Layout/HeredocIndentation:
   Exclude:
     - 'lib/grape/router/route.rb'
     - 'spec/grape/api_spec.rb'
     - 'spec/grape/entity_spec.rb'
 
+# Offense count: 9
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: symmetrical, new_line, same_line
+Layout/MultilineArrayBraceLayout:
+  Exclude:
+    - 'spec/grape/validations_spec.rb'
+
+# Offense count: 13
+# Cop supports --auto-correct.
+Layout/SpaceBeforeBrackets:
+  Exclude:
+    - 'spec/grape/api_remount_spec.rb'
+    - 'spec/grape/dsl/desc_spec.rb'
+    - 'spec/grape/entity_spec.rb'
+    - 'spec/grape/exceptions/invalid_accept_header_spec.rb'
+
+# Offense count: 71
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
+# SupportedStyles: space, no_space, compact
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceInsideHashLiteralBraces:
+  Exclude:
+    - 'spec/grape/validations_spec.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: AllowInHeredoc.
+Layout/TrailingWhitespace:
+  Exclude:
+    - 'spec/grape/validations_spec.rb'
+
 # Offense count: 1
 Lint/AmbiguousBlockAssociation:
   Exclude:
     - 'spec/grape/dsl/routing_spec.rb'
 
+# Offense count: 54
+# Configuration parameters: AllowedMethods.
+# AllowedMethods: enums
+Lint/ConstantDefinitionInBlock:
+  Enabled: false
+
+# Offense count: 5
+# Configuration parameters: IgnoreLiteralBranches, IgnoreConstantBranches.
+Lint/DuplicateBranch:
+  Exclude:
+    - 'lib/grape/extensions/deep_symbolize_hash.rb'
+    - 'spec/support/versioned_helpers.rb'
+
+# Offense count: 85
+# Configuration parameters: AllowComments, AllowEmptyLambdas.
+Lint/EmptyBlock:
+  Enabled: false
+
+# Offense count: 6
+# Configuration parameters: AllowComments.
+Lint/EmptyClass:
+  Exclude:
+    - 'lib/grape/dsl/parameters.rb'
+    - 'lib/grape/validations/types.rb'
+    - 'spec/grape/api_spec.rb'
+    - 'spec/grape/entity_spec.rb'
+    - 'spec/grape/middleware/stack_spec.rb'
+
+# Offense count: 9
+Lint/MissingSuper:
+  Exclude:
+    - 'lib/grape/api.rb'
+    - 'lib/grape/api/instance.rb'
+    - 'lib/grape/exceptions/base.rb'
+    - 'lib/grape/exceptions/validation_array_errors.rb'
+    - 'lib/grape/namespace.rb'
+    - 'lib/grape/path.rb'
+    - 'lib/grape/router/pattern.rb'
+    - 'lib/grape/validations/validators/base.rb'
+
 # Offense count: 1
 # Cop supports --auto-correct.
 Lint/NonDeterministicRequireOrder:
@@ -59,54 +146,68 @@ Lint/ToJSON:
   Exclude:
     - 'spec/grape/middleware/formatter_spec.rb'
 
-# Offense count: 50
-# Configuration parameters: IgnoredMethods.
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AllowComments.
+Lint/UselessMethodDefinition:
+  Exclude:
+    - 'lib/grape/validations/validators/coerce.rb'
+
+# Offense count: 42
+# Configuration parameters: IgnoredMethods, CountRepeatedAttributes.
 Metrics/AbcSize:
-  Max: 43
+  Max: 47
 
 # Offense count: 6
-# Configuration parameters: CountComments, ExcludedMethods.
-# ExcludedMethods: refine
+# Configuration parameters: CountComments, CountAsOne, ExcludedMethods, IgnoredMethods.
+# IgnoredMethods: refine
 Metrics/BlockLength:
   Max: 182
 
 # Offense count: 11
-# Configuration parameters: CountComments.
+# Configuration parameters: CountComments, CountAsOne.
 Metrics/ClassLength:
   Max: 304
 
 # Offense count: 30
 # Configuration parameters: IgnoredMethods.
 Metrics/CyclomaticComplexity:
-  Max: 14
+  Max: 17
 
-# Offense count: 69
-# Configuration parameters: CountComments, ExcludedMethods.
+# Offense count: 71
+# Configuration parameters: CountComments, CountAsOne, ExcludedMethods, IgnoredMethods.
 Metrics/MethodLength:
   Max: 32
 
 # Offense count: 12
-# Configuration parameters: CountComments.
+# Configuration parameters: CountComments, CountAsOne.
 Metrics/ModuleLength:
   Max: 220
 
-# Offense count: 25
+# Offense count: 1
+# Configuration parameters: Max, CountKeywordArgs, MaxOptionalParameters.
+Metrics/ParameterLists:
+  Exclude:
+    - 'lib/grape/middleware/error.rb'
+
+# Offense count: 27
 # Configuration parameters: IgnoredMethods.
 Metrics/PerceivedComplexity:
-  Max: 14
+  Max: 18
 
-# Offense count: 3
+# Offense count: 4
 # Configuration parameters: EnforcedStyleForLeadingUnderscores.
 # SupportedStylesForLeadingUnderscores: disallowed, required, optional
 Naming/MemoizedInstanceVariableName:
   Exclude:
     - 'lib/grape/api/instance.rb'
+    - 'lib/grape/config.rb'
     - 'lib/grape/middleware/base.rb'
     - 'spec/grape/integration/rack_spec.rb'
 
 # Offense count: 5
 # Configuration parameters: MinNameLength, AllowNamesEndingInNumbers, AllowedNames, ForbiddenNames.
-# AllowedNames: io, id, to, by, on, in, at, ip, db, os, pp
+# AllowedNames: at, by, db, id, in, io, ip, of, on, os, pp, to
 Naming/MethodParameterName:
   Exclude:
     - 'lib/grape/endpoint.rb'
@@ -114,12 +215,95 @@ Naming/MethodParameterName:
     - 'lib/grape/middleware/stack.rb'
     - 'spec/grape/api_spec.rb'
 
+# Offense count: 18
+# Configuration parameters: EnforcedStyle, CheckMethodNames, CheckSymbols, AllowedIdentifiers.
+# SupportedStyles: snake_case, normalcase, non_integer
+# AllowedIdentifiers: capture3, iso8601, rfc1123_date, rfc822, rfc2822, rfc3339
+Naming/VariableNumber:
+  Exclude:
+    - 'spec/grape/dsl/settings_spec.rb'
+    - 'spec/grape/exceptions/validation_errors_spec.rb'
+    - 'spec/grape/validations_spec.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+Performance/BigDecimalWithNumericArgument:
+  Exclude:
+    - 'spec/grape/validations/types/primitive_coercer_spec.rb'
+
+# Offense count: 21
+# Cop supports --auto-correct.
+Performance/BlockGivenWithExplicitBlock:
+  Exclude:
+    - 'lib/grape/api/instance.rb'
+    - 'lib/grape/dsl/desc.rb'
+    - 'lib/grape/dsl/helpers.rb'
+    - 'lib/grape/dsl/middleware.rb'
+    - 'lib/grape/dsl/parameters.rb'
+    - 'lib/grape/dsl/request_response.rb'
+    - 'lib/grape/dsl/routing.rb'
+    - 'lib/grape/dsl/settings.rb'
+    - 'lib/grape/endpoint.rb'
+    - 'lib/grape/validations/params_scope.rb'
+
+# Offense count: 2
+# Configuration parameters: MinSize.
+Performance/CollectionLiteralInLoop:
+  Exclude:
+    - 'spec/grape/api_spec.rb'
+    - 'spec/grape/middleware/formatter_spec.rb'
+
 # Offense count: 3
 # Cop supports --auto-correct.
 Performance/InefficientHashSearch:
   Exclude:
     - 'spec/grape/validations/validators/values_spec.rb'
 
+# Offense count: 1
+Performance/MethodObjectAsBlock:
+  Exclude:
+    - 'lib/grape/middleware/stack.rb'
+
+# Offense count: 9
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: separated, grouped
+Style/AccessorGrouping:
+  Exclude:
+    - 'lib/grape/api/instance.rb'
+    - 'lib/grape/exceptions/validation.rb'
+    - 'lib/grape/util/inheritable_setting.rb'
+    - 'spec/grape/middleware/error_spec.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+Style/CaseLikeIf:
+  Exclude:
+    - 'lib/grape/util/lazy_value.rb'
+    - 'spec/grape/validations/validators/coerce_spec.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: IgnoredMethods.
+# IgnoredMethods: ==, equal?, eql?
+Style/ClassEqualityComparison:
+  Exclude:
+    - 'lib/grape/validations/types/dry_type_coercer.rb'
+    - 'lib/grape/validations/validators/coerce.rb'
+
+# Offense count: 1
+Style/CombinableLoops:
+  Exclude:
+    - 'spec/grape/endpoint_spec.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: Keywords.
+# Keywords: TODO, FIXME, OPTIMIZE, HACK, REVIEW, NOTE
+Style/CommentAnnotation:
+  Exclude:
+    - 'spec/grape/api_spec.rb'
+
 # Offense count: 5
 # Cop supports --auto-correct.
 Style/EmptyLambdaParameter:
@@ -138,12 +322,24 @@ Style/ExpandPathArguments:
     - 'lib/grape.rb'
     - 'spec/grape/validations/validators/coerce_spec.rb'
 
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/ExplicitBlockArgument:
+  Exclude:
+    - 'lib/grape/middleware/stack.rb'
+
 # Offense count: 2
-# Configuration parameters: .
+# Configuration parameters: MaxUnannotatedPlaceholdersAllowed.
 # SupportedStyles: annotated, template, unannotated
 Style/FormatStringToken:
   EnforcedStyle: template
 
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/GlobalStdStream:
+  Exclude:
+    - 'benchmark/remounting.rb'
+
 # Offense count: 19
 # Cop supports --auto-correct.
 Style/IfUnlessModifier:
@@ -159,20 +355,41 @@ Style/IfUnlessModifier:
     - 'lib/grape/middleware/versioner/accept_version_header.rb'
     - 'lib/grape/validations/params_scope.rb'
 
-# Offense count: 1
-Style/MethodMissingSuper:
-  Exclude:
-    - 'lib/grape/router/attribute_translator.rb'
-
 # Offense count: 1
 # Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, EnforcedStyle, IgnoredMethods.
+# Configuration parameters: EnforcedStyle, IgnoredMethods.
 # SupportedStyles: predicate, comparison
 Style/NumericPredicate:
   Exclude:
     - 'spec/**/*'
     - 'lib/grape/middleware/formatter.rb'
 
+# Offense count: 12
+# Configuration parameters: AllowedMethods.
+# AllowedMethods: respond_to_missing?
+Style/OptionalBooleanParameter:
+  Exclude:
+    - 'lib/grape/api.rb'
+    - 'lib/grape/dsl/inside_route.rb'
+    - 'lib/grape/dsl/parameters.rb'
+    - 'lib/grape/endpoint.rb'
+    - 'lib/grape/serve_stream/sendfile_response.rb'
+    - 'lib/grape/validations/params_scope.rb'
+    - 'lib/grape/validations/types/array_coercer.rb'
+    - 'lib/grape/validations/types/custom_type_collection_coercer.rb'
+    - 'lib/grape/validations/types/dry_type_coercer.rb'
+    - 'lib/grape/validations/types/primitive_coercer.rb'
+    - 'lib/grape/validations/types/set_coercer.rb'
+
+# Offense count: 18
+# Cop supports --auto-correct.
+Style/RedundantRegexpEscape:
+  Exclude:
+    - 'lib/grape/middleware/versioner/header.rb'
+    - 'lib/grape/middleware/versioner/parse_media_type_patch.rb'
+    - 'spec/grape/api/routes_with_requirements_spec.rb'
+    - 'spec/grape/api_spec.rb'
+
 # Offense count: 10
 # Cop supports --auto-correct.
 # Configuration parameters: ConvertCodeThatCanStartToReturnNil, AllowedMethods.
@@ -187,6 +404,42 @@ Style/SafeNavigation:
     - 'lib/grape/middleware/versioner/accept_version_header.rb'
     - 'lib/grape/middleware/versioner/header.rb'
 
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: AllowModifier.
+Style/SoleNestedConditional:
+  Exclude:
+    - 'lib/grape/api/instance.rb'
+    - 'lib/grape/middleware/versioner/accept_version_header.rb'
+    - 'lib/grape/validations/params_scope.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+Style/StringConcatenation:
+  Exclude:
+    - 'benchmark/large_model.rb'
+    - 'lib/grape/dsl/inside_route.rb'
+    - 'lib/grape/router/pattern.rb'
+    - 'spec/grape/validations/validators/values_spec.rb'
+    - 'spec/shared/versioning_examples.rb'
+    - 'spec/support/basic_auth_encode_helpers.rb'
+
+# Offense count: 32
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
+# SupportedStyles: single_quotes, double_quotes
+Style/StringLiterals:
+  Exclude:
+    - 'spec/grape/validations_spec.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyleForMultiline.
+# SupportedStylesForMultiline: comma, consistent_comma, no_comma
+Style/TrailingCommaInArguments:
+  Exclude:
+    - 'spec/grape/validations/single_attribute_iterator_spec.rb'
+
 # Offense count: 10
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, MinSize, WordRegex.
@@ -196,7 +449,7 @@ Style/WordArray:
     - 'spec/grape/validations/validators/except_values_spec.rb'
     - 'spec/grape/validations/validators/values_spec.rb'
 
-# Offense count: 131
+# Offense count: 132
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 48632523dc..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,64 +0,0 @@
-language: ruby
-
-sudo: false
-
-# "gemfile" is required for "allow_failures" option,
-# see https://docs.travis-ci.com/user/customizing-the-build/#matching-jobs-with-allow_failures
-gemfile:
-
-script: bundle exec rake spec
-
-matrix:
-  include:
-    - rvm: 2.7.1
-      script:
-        - bundle exec danger
-    - rvm: 2.7.1
-      gemfile: Gemfile
-    - rvm: 2.7.1
-      gemfile: gemfiles/rack1.gemfile
-    - rvm: 2.7.1
-      gemfile: gemfiles/rack2.gemfile
-    - rvm: 2.7.1
-      gemfile: gemfiles/rack_edge.gemfile
-    - rvm: 2.7.1
-      gemfile: gemfiles/rails_edge.gemfile
-    - rvm: 2.7.1
-      gemfile: gemfiles/rails_5.gemfile
-    - rvm: 2.7.1
-      gemfile: gemfiles/rails_6.gemfile
-    - rvm: 2.7.1
-      gemfile: Gemfile
-      script:
-        - bundle exec rspec spec/integration/eager_load
-    - rvm: 2.7.1
-      gemfile: gemfiles/multi_json.gemfile
-      script:
-        - bundle exec rspec spec/integration/multi_json
-    - rvm: 2.7.1
-      gemfile: gemfiles/multi_xml.gemfile
-      script:
-        - bundle exec rspec spec/integration/multi_xml
-    - rvm: 2.6.6
-      gemfile: Gemfile
-    - rvm: 2.6.6
-      gemfile: gemfiles/rails_5.gemfile
-    - rvm: 2.6.6
-      gemfile: gemfiles/rails_6.gemfile
-    - rvm: 2.5.8
-      gemfile: Gemfile
-    - rvm: 2.5.8
-      gemfile: gemfiles/rails_5.gemfile
-    - rvm: 2.5.8
-      gemfile: gemfiles/rails_6.gemfile
-    - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: rbx-3
-    - rvm: truffleruby-head
-  allow_failures:
-    - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: rbx-3
-    - rvm: truffleruby-head
-
-bundler_args: --without development
diff --git a/Appraisals b/Appraisals
index 7e17deba50..1613cfa03d 100644
--- a/Appraisals
+++ b/Appraisals
@@ -8,6 +8,10 @@ appraise 'rails-6' do
   gem 'rails', '~> 6.0'
 end
 
+appraise 'rails-6-1' do
+  gem 'rails', '~> 6.1'
+end
+
 appraise 'rails-edge' do
   gem 'rails', github: 'rails/rails'
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5cef5172ff..7d89d93528 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,10 +3,13 @@
 #### Features
 
 * Your contribution here.
+* [#2143](https://github.com/ruby-grape/grape/pull/2143): Enable GitHub Actions with updated RuboCop and Danger - [@anakinj](https://github.com/anakinj).
+* [#2145](https://github.com/ruby-grape/grape/pull/2145): Ruby 3.0 compatibility - [@ericproulx](https://github.com/ericproulx).
 
 #### Fixes
 
 * Your contribution here.
+* [#2144](https://github.com/ruby-grape/grape/pull/2144): Fix compatibility issue with activesupport 6.1 and XML serialization of arrays - [@anakinj](https://github.com/anakinj).
 * [#2137](https://github.com/ruby-grape/grape/pull/2137): Fix typos - [@johnny-miyake](https://github.com/johnny-miyake).
 * [#2131](https://github.com/ruby-grape/grape/pull/2131): Fix Ruby 2.7 keyword deprecation warning in validators/coerce - [@K0H205](https://github.com/K0H205).
 * [#2132](https://github.com/ruby-grape/grape/pull/2132): Use #ruby2_keywords for correct delegation on Ruby <= 2.6, 2.7 and 3 - [@eregon](https://github.com/eregon).
diff --git a/Dangerfile b/Dangerfile
index 2f12006400..527dbb8b7a 100644
--- a/Dangerfile
+++ b/Dangerfile
@@ -1,4 +1,4 @@
 # frozen_string_literal: true
 
 danger.import_dangerfile(gem: 'ruby-grape-danger')
-toc.check
+toc.check!
diff --git a/Gemfile b/Gemfile
index 99de12cfb7..6c4124a52d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,9 +10,9 @@ group :development, :test do
   gem 'bundler'
   gem 'hashie'
   gem 'rake'
-  gem 'rubocop', '0.84.0'
-  gem 'rubocop-ast', '< 0.7'
-  gem 'rubocop-performance', require: false
+  gem 'rubocop', '1.7.0'
+  gem 'rubocop-ast', '1.3.0'
+  gem 'rubocop-performance', '1.9.1', require: false
 end
 
 group :development do
@@ -27,12 +27,11 @@ end
 group :test do
   gem 'cookiejar'
   gem 'coveralls_reborn'
-  gem 'danger-toc', '~> 0.1.2'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'mime-types'
   gem 'rack-jsonp', require: 'rack/jsonp'
   gem 'rack-test', '~> 1.1.0'
   gem 'rspec', '~> 3.0'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
+  gem 'ruby-grape-danger', '~> 0.2.0', require: false
 end
diff --git a/README.md b/README.md
index 0261cbc531..9e3a1dd6c4 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 ![grape logo](grape.png)
 
 [![Gem Version](https://badge.fury.io/rb/grape.svg)](http://badge.fury.io/rb/grape)
-[![Build Status](https://travis-ci.org/ruby-grape/grape.svg?branch=master)](https://travis-ci.org/ruby-grape/grape)
+[![Build Status](https://github.com/ruby-grape/grape/workflows/test/badge.svg?branch=master)](https://github.com/ruby-grape/grape/actions)
 [![Code Climate](https://codeclimate.com/github/ruby-grape/grape.svg)](https://codeclimate.com/github/ruby-grape/grape)
 [![Coverage Status](https://coveralls.io/repos/github/ruby-grape/grape/badge.svg?branch=master)](https://coveralls.io/github/ruby-grape/grape?branch=master)
 [![Inline docs](https://inch-ci.org/github/ruby-grape/grape.svg)](https://inch-ci.org/github/ruby-grape/grape)
diff --git a/gemfiles/rails_6_1.gemfile b/gemfiles/rails_6_1.gemfile
new file mode 100644
index 0000000000..53755018da
--- /dev/null
+++ b/gemfiles/rails_6_1.gemfile
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# This file was generated by Appraisal
+
+source 'https://rubygems.org'
+
+gem 'rails', '~> 6.1'
+
+group :development, :test do
+  gem 'bundler'
+  gem 'hashie'
+  gem 'rake'
+  gem 'rubocop', '0.84.0'
+  gem 'rubocop-ast', '< 0.7'
+  gem 'rubocop-performance', require: false
+end
+
+group :development do
+  gem 'appraisal'
+  gem 'benchmark-ips'
+  gem 'guard'
+  gem 'guard-rspec'
+  gem 'guard-rubocop'
+end
+
+group :test do
+  gem 'cookiejar'
+  gem 'coveralls_reborn'
+  gem 'danger-toc', '~> 0.1.2'
+  gem 'grape-entity', '~> 0.6'
+  gem 'maruku'
+  gem 'mime-types'
+  gem 'rack-jsonp', require: 'rack/jsonp'
+  gem 'rack-test', '~> 1.1.0'
+  gem 'rspec', '~> 3.0'
+  gem 'ruby-grape-danger', '~> 0.1.0', require: false
+end
+
+gemspec path: '../'
diff --git a/lib/grape.rb b/lib/grape.rb
index e2a0b98082..c1f313c2f9 100644
--- a/lib/grape.rb
+++ b/lib/grape.rb
@@ -12,6 +12,7 @@
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/array/wrap'
+require 'active_support/core_ext/array/conversions'
 require 'active_support/core_ext/hash/deep_merge'
 require 'active_support/core_ext/hash/reverse_merge'
 require 'active_support/core_ext/hash/except'
diff --git a/lib/grape/dsl/routing.rb b/lib/grape/dsl/routing.rb
index 76a22a79f0..61bf1f21a8 100644
--- a/lib/grape/dsl/routing.rb
+++ b/lib/grape/dsl/routing.rb
@@ -79,11 +79,12 @@ def do_not_route_options!
           namespace_inheritable(:do_not_route_options, true)
         end
 
-        def mount(mounts, **opts)
+        def mount(mounts, *opts)
           mounts = { mounts => '/' } unless mounts.respond_to?(:each_pair)
           mounts.each_pair do |app, path|
             if app.respond_to?(:mount_instance)
-              mount(app.mount_instance(configuration: opts[:with] || {}) => path)
+              opts_with = opts.any? ? opts.shift[:with] : {}
+              mount({ app.mount_instance(configuration: opts_with) => path })
               next
             end
             in_setting = inheritable_setting
diff --git a/lib/grape/exceptions/validation_errors.rb b/lib/grape/exceptions/validation_errors.rb
index f8bf32e31e..20f7dd2bfd 100644
--- a/lib/grape/exceptions/validation_errors.rb
+++ b/lib/grape/exceptions/validation_errors.rb
@@ -39,7 +39,7 @@ def as_json(**_opts)
         end
       end
 
-      def to_json(**_opts)
+      def to_json(*_opts)
         as_json.to_json
       end
 
diff --git a/lib/grape/middleware/auth/base.rb b/lib/grape/middleware/auth/base.rb
index 61a8cc5889..081613c920 100644
--- a/lib/grape/middleware/auth/base.rb
+++ b/lib/grape/middleware/auth/base.rb
@@ -10,9 +10,9 @@ class Base
 
         attr_accessor :options, :app, :env
 
-        def initialize(app, **options)
+        def initialize(app, *options)
           @app = app
-          @options = options
+          @options = options.shift
         end
 
         def call(env)
@@ -23,7 +23,7 @@ def _call(env)
           self.env = env
 
           if options.key?(:type)
-            auth_proc         = options[:proc]
+            auth_proc = options[:proc]
             auth_proc_context = context
 
             strategy_info = Grape::Middleware::Auth::Strategies[options[:type]]
diff --git a/lib/grape/middleware/base.rb b/lib/grape/middleware/base.rb
index 0e0f1729c4..730a6cb3cb 100644
--- a/lib/grape/middleware/base.rb
+++ b/lib/grape/middleware/base.rb
@@ -15,9 +15,9 @@ class Base
 
       # @param [Rack Application] app The standard argument for a Rack middleware.
       # @param [Hash] options A hash of options, simply stored for use by subclasses.
-      def initialize(app, **options)
+      def initialize(app, *options)
         @app = app
-        @options = default_options.merge(options)
+        @options = options.any? ? default_options.merge(options.shift) : default_options
         @app_response = nil
       end
 
diff --git a/lib/grape/middleware/error.rb b/lib/grape/middleware/error.rb
index 54bded3c87..20f6a89f35 100644
--- a/lib/grape/middleware/error.rb
+++ b/lib/grape/middleware/error.rb
@@ -27,7 +27,7 @@ def default_options
         }
       end
 
-      def initialize(app, **options)
+      def initialize(app, *options)
         super
         self.class.send(:include, @options[:helpers]) if @options[:helpers]
       end
diff --git a/lib/grape/validations/validators/base.rb b/lib/grape/validations/validators/base.rb
index af7030f140..f45a254ca5 100644
--- a/lib/grape/validations/validators/base.rb
+++ b/lib/grape/validations/validators/base.rb
@@ -12,14 +12,16 @@ class Base
       # @param options [Object] implementation-dependent Validator options
       # @param required [Boolean] attribute(s) are required or optional
       # @param scope [ParamsScope] parent scope for this Validator
-      # @param opts [Hash] additional validation options
-      def initialize(attrs, options, required, scope, **opts)
+      # @param opts [Array] additional validation options
+      def initialize(attrs, options, required, scope, *opts)
         @attrs = Array(attrs)
         @option = options
         @required = required
         @scope = scope
-        @fail_fast = opts[:fail_fast] || false
-        @allow_blank = opts[:allow_blank] || false
+        @opts = opts
+        opts = opts.any? ? opts.shift : {}
+        @fail_fast = opts.fetch(:fail_fast, false)
+        @allow_blank = opts.fetch(:allow_blank, false)
       end
 
       # Validates a given request.
diff --git a/spec/grape/request_spec.rb b/spec/grape/request_spec.rb
index ee5a436430..1bfce035e0 100644
--- a/spec/grape/request_spec.rb
+++ b/spec/grape/request_spec.rb
@@ -75,7 +75,7 @@ module Grape
         Grape.config.reset
       end
 
-      subject(:request_params) { Grape::Request.new(env, opts).params }
+      subject(:request_params) { Grape::Request.new(env, **opts).params }
 
       context 'when the API does not include a specific param builder' do
         let(:opts) { {} }
diff --git a/spec/shared/versioning_examples.rb b/spec/shared/versioning_examples.rb
index 8e8552070c..ebc0742d41 100644
--- a/spec/shared/versioning_examples.rb
+++ b/spec/shared/versioning_examples.rb
@@ -7,7 +7,7 @@
     subject.get :hello do
       "Version: #{request.env['api.version']}"
     end
-    versioned_get '/hello', 'v1', macro_options
+    versioned_get '/hello', 'v1', **macro_options
     expect(last_response.body).to eql 'Version: v1'
   end
 
@@ -18,7 +18,7 @@
     subject.get :hello do
       "Version: #{request.env['api.version']}"
     end
-    versioned_get '/hello', 'v1', macro_options.merge(prefix: 'api')
+    versioned_get '/hello', 'v1', **macro_options.merge(prefix: 'api')
     expect(last_response.body).to eql 'Version: v1'
   end
 
@@ -34,14 +34,14 @@
       end
     end
 
-    versioned_get '/awesome', 'v1', macro_options
+    versioned_get '/awesome', 'v1', **macro_options
     expect(last_response.status).to eql 404
 
-    versioned_get '/awesome', 'v2', macro_options
+    versioned_get '/awesome', 'v2', **macro_options
     expect(last_response.status).to eql 200
-    versioned_get '/legacy', 'v1', macro_options
+    versioned_get '/legacy', 'v1', **macro_options
     expect(last_response.status).to eql 200
-    versioned_get '/legacy', 'v2', macro_options
+    versioned_get '/legacy', 'v2', **macro_options
     expect(last_response.status).to eql 404
   end
 
@@ -51,11 +51,11 @@
       'I exist'
     end
 
-    versioned_get '/awesome', 'v1', macro_options
+    versioned_get '/awesome', 'v1', **macro_options
     expect(last_response.status).to eql 200
-    versioned_get '/awesome', 'v2', macro_options
+    versioned_get '/awesome', 'v2', **macro_options
     expect(last_response.status).to eql 200
-    versioned_get '/awesome', 'v3', macro_options
+    versioned_get '/awesome', 'v3', **macro_options
     expect(last_response.status).to eql 404
   end
 
@@ -74,10 +74,10 @@
           end
         end
 
-        versioned_get '/version', 'v2', macro_options
+        versioned_get '/version', 'v2', **macro_options
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('v2')
-        versioned_get '/version', 'v1', macro_options
+        versioned_get '/version', 'v1', **macro_options
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('version v1')
       end
@@ -98,11 +98,11 @@
           end
         end
 
-        versioned_get '/version', 'v1', macro_options.merge(prefix: subject.prefix)
+        versioned_get '/version', 'v1', **macro_options.merge(prefix: subject.prefix)
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('version v1')
 
-        versioned_get '/version', 'v2', macro_options.merge(prefix: subject.prefix)
+        versioned_get '/version', 'v2', **macro_options.merge(prefix: subject.prefix)
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('v2')
       end
@@ -131,11 +131,11 @@
         end
       end
 
-      versioned_get '/version', 'v1', macro_options.merge(prefix: subject.prefix)
+      versioned_get '/version', 'v1', **macro_options.merge(prefix: subject.prefix)
       expect(last_response.status).to eq(200)
       expect(last_response.body).to eq('v1-version')
 
-      versioned_get '/version', 'v2', macro_options.merge(prefix: subject.prefix)
+      versioned_get '/version', 'v2', **macro_options.merge(prefix: subject.prefix)
       expect(last_response.status).to eq(200)
       expect(last_response.body).to eq('v2-version')
     end
@@ -148,7 +148,7 @@
     subject.get :api_version_with_version_param do
       params[:version]
     end
-    versioned_get '/api_version_with_version_param?version=1', 'v1', macro_options
+    versioned_get '/api_version_with_version_param?version=1', 'v1', **macro_options
     expect(last_response.body).to eql '1'
   end
 
@@ -183,13 +183,13 @@
 
     context 'v1' do
       it 'finds endpoint' do
-        versioned_get '/version', 'v1', macro_options
+        versioned_get '/version', 'v1', **macro_options
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('v1')
       end
 
       it 'finds catch all' do
-        versioned_get '/whatever', 'v1', macro_options
+        versioned_get '/whatever', 'v1', **macro_options
         expect(last_response.status).to eq(200)
         expect(last_response.body).to end_with 'whatever'
       end
@@ -197,13 +197,13 @@
 
     context 'v2' do
       it 'finds endpoint' do
-        versioned_get '/version', 'v2', macro_options
+        versioned_get '/version', 'v2', **macro_options
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('v2')
       end
 
       it 'finds catch all' do
-        versioned_get '/whatever', 'v2', macro_options
+        versioned_get '/whatever', 'v2', **macro_options
         expect(last_response.status).to eq(200)
         expect(last_response.body).to end_with 'whatever'
       end
diff --git a/spec/support/versioned_helpers.rb b/spec/support/versioned_helpers.rb
index 8d7c07f184..ea78013d43 100644
--- a/spec/support/versioned_helpers.rb
+++ b/spec/support/versioned_helpers.rb
@@ -44,7 +44,7 @@ def versioned_headers(**options)
       end
 
       def versioned_get(path, version_name, **version_options)
-        path    = versioned_path(version_options.merge(version: version_name, path: path))
+        path = versioned_path(**version_options.merge(version: version_name, path: path))
         headers = versioned_headers(**version_options.merge(version: version_name))
         params = {}
         params = { version_options[:parameter] => version_name } if version_options[:using] == :param