diff --git a/.gitignore b/.gitignore
index b04a8c8..32a5b90 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,5 @@
 
 # rspec failure tracking
 .rspec_status
+
+.rubocop-*
diff --git a/.rubocop.yml b/.rubocop.yml
index e3462a7..3ae2458 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,13 +1,18 @@
-AllCops:
-  TargetRubyVersion: 2.6
-
-Style/StringLiterals:
-  Enabled: true
-  EnforcedStyle: double_quotes
+inherit_from:
+  - https://raw.githubusercontent.com/cookpad/guides/master/.rubocop.yml
 
-Style/StringLiteralsInInterpolation:
-  Enabled: true
-  EnforcedStyle: double_quotes
+AllCops:
+  TargetRubyVersion: 3.0
+  NewCops: enable
+  Exclude:
+    - vendor/**/*
+    - vendor/**/.*
 
-Layout/LineLength:
-  Max: 120
+Style/TrailingCommaInHashLiteral:
+  EnforcedStyleForMultiline: comma
+Style/TrailingCommaInArguments:
+  EnforcedStyleForMultiline: comma
+RSpec/DescribedClass:
+  Enabled: false
+Gemspec/DevelopmentDependencies:
+  Enabled: false
diff --git a/Gemfile b/Gemfile
index fde5caf..8f80798 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,8 @@ source "https://rubygems.org"
 gemspec
 
 gem "rake", "~> 13.0"
-
 gem "rspec", "~> 3.0"
-
 gem "rubocop", "~> 1.21"
+gem "rubocop-performance"
+gem "rubocop-rails"
+gem "rubocop-rspec"
diff --git a/Gemfile.lock b/Gemfile.lock
index e47fb11..eef14c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,15 +6,35 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (7.1.3.3)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
     ast (2.4.2)
+    base64 (0.2.0)
+    bigdecimal (3.1.8)
+    concurrent-ruby (1.3.1)
+    connection_pool (2.4.1)
     diff-lcs (1.5.1)
+    drb (2.2.1)
+    i18n (1.14.5)
+      concurrent-ruby (~> 1.0)
     json (2.7.2)
     language_server-protocol (3.17.0.3)
+    minitest (5.23.1)
+    mutex_m (0.2.0)
     parallel (1.24.0)
     parser (3.3.1.0)
       ast (~> 2.4.1)
       racc
     racc (1.7.3)
+    rack (3.0.11)
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.9.0)
@@ -46,8 +66,29 @@ GEM
       unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.31.3)
       parser (>= 3.3.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails (2.25.0)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rspec (2.29.2)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.3)
+      rubocop (~> 1.40)
     ruby-progressbar (1.13.0)
     strscan (3.1.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
     unicode-display_width (2.5.0)
 
 PLATFORMS
@@ -59,6 +100,9 @@ DEPENDENCIES
   rake (~> 13.0)
   rspec (~> 3.0)
   rubocop (~> 1.21)
+  rubocop-performance
+  rubocop-rails
+  rubocop-rspec
 
 BUNDLED WITH
    2.5.7
diff --git a/Rakefile b/Rakefile
index cca7175..9a7fd8d 100644
--- a/Rakefile
+++ b/Rakefile
@@ -9,4 +9,4 @@ require "rubocop/rake_task"
 
 RuboCop::RakeTask.new
 
-task default: %i[spec rubocop]
+task default: %i(spec rubocop)
diff --git a/millrace.gemspec b/millrace.gemspec
index 7b2361e..de3f05c 100644
--- a/millrace.gemspec
+++ b/millrace.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "Leaky bucket rate limiting for Action Controller before filters"
   spec.homepage = "https://github.com/errm/millrace"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 2.6.0"
+  spec.required_ruby_version = ">= 3.0.0"
 
   spec.metadata["allowed_push_host"] = "https://rubygems.org"
 
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.files = Dir.chdir(__dir__) do
     `git ls-files -z`.split("\x0").reject do |f|
       (File.expand_path(f) == __FILE__) ||
-        f.start_with?(*%w[bin/ test/ spec/ features/ .git .github Gemfile])
+        f.start_with?(*%w(bin/ test/ spec/ features/ .git .github Gemfile))
     end
   end
   spec.bindir = "exe"
@@ -37,4 +37,5 @@ Gem::Specification.new do |spec|
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html
+  spec.metadata["rubygems_mfa_required"] = "true"
 end