diff --git a/.rubocop.yml b/.rubocop.yml
index bb580f41..5422099f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,6 +4,12 @@ AllCops:
   TargetRubyVersion: 3.0
   NewCops: enable
   SuggestExtensions: false
+  Exclude:
+    - 'node_modules/**/*'
+    - 'tmp/**/*'
+    - 'vendor/**/*'
+    - '.git/**/*'
+    - 'docs/**/*'
 
 Metrics:
   Enabled: false
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 3055e1ca..01388ec3 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,19 +1,11 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --exclude-limit 10000`
-# on 2024-11-22 18:44:50 UTC using RuboCop version 1.68.0.
+# on 2025-03-01 10:06:34 UTC using RuboCop version 1.73.1.
 # 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: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: outdent, indent
-Layout/AccessModifierIndentation:
-  Exclude:
-    - 'lib/inertia_rails/configuration.rb'
-
 # Offense count: 2
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, IndentationWidth.
@@ -23,7 +15,7 @@ Layout/ArgumentAlignment:
     - 'bin/console'
     - 'spec/inertia/response_spec.rb'
 
-# Offense count: 5
+# Offense count: 9
 # This cop supports safe autocorrection (--autocorrect).
 Layout/BlockEndNewline:
   Exclude:
@@ -37,18 +29,10 @@ Layout/CaseIndentation:
   Exclude:
     - 'lib/inertia_rails/renderer.rb'
 
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowForAlignment.
-Layout/CommentIndentation:
-  Exclude:
-    - 'lib/inertia_rails/rspec.rb'
-
-# Offense count: 2
+# Offense count: 1
 # This cop supports safe autocorrection (--autocorrect).
 Layout/EmptyLineAfterGuardClause:
   Exclude:
-    - 'lib/inertia_rails/configuration.rb'
     - 'lib/inertia_rails/controller.rb'
 
 # Offense count: 1
@@ -97,14 +81,7 @@ Layout/FirstArgumentIndentation:
 Layout/FirstHashElementIndentation:
   EnforcedStyle: consistent
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: Width, AllowedPatterns.
-Layout/IndentationWidth:
-  Exclude:
-    - 'spec/inertia/configuration_spec.rb'
-
-# Offense count: 5
+# Offense count: 9
 # This cop supports safe autocorrection (--autocorrect).
 Layout/MultilineBlockLayout:
   Exclude:
@@ -118,7 +95,7 @@ Layout/MultilineMethodCallIndentation:
   Exclude:
     - 'spec/inertia/ssr_spec.rb'
 
-# Offense count: 7
+# Offense count: 6
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
 # SupportedStyles: space, no_space
@@ -139,19 +116,18 @@ Layout/SpaceInsideArrayLiteralBrackets:
     - 'spec/dummy/app/controllers/inertia_test_controller.rb'
     - 'spec/dummy/config/environments/production.rb'
 
-# Offense count: 20
+# Offense count: 13
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces, SpaceBeforeBlockParameters.
 # SupportedStyles: space, no_space
 # SupportedStylesForEmptyBraces: space, no_space
 Layout/SpaceInsideBlockBraces:
   Exclude:
-    - 'spec/inertia/configuration_spec.rb'
     - 'spec/inertia/error_sharing_spec.rb'
     - 'spec/inertia/rendering_spec.rb'
     - 'spec/inertia/request_spec.rb'
 
-# Offense count: 128
+# Offense count: 122
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
 # SupportedStyles: space, no_space, compact
@@ -163,7 +139,6 @@ Layout/SpaceInsideHashLiteralBraces:
     - 'spec/dummy/app/controllers/inertia_conditional_sharing_controller.rb'
     - 'spec/dummy/app/controllers/inertia_share_test_controller.rb'
     - 'spec/inertia/conditional_sharing_spec.rb'
-    - 'spec/inertia/configuration_spec.rb'
     - 'spec/inertia/middleware_spec.rb'
     - 'spec/inertia/rails_mimic_spec.rb'
     - 'spec/inertia/rendering_spec.rb'
@@ -181,7 +156,7 @@ Layout/TrailingEmptyLines:
     - 'lib/tasks/inertia_rails.rake'
     - 'spec/inertia/rails_mimic_spec.rb'
 
-# Offense count: 12
+# Offense count: 10
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: AllowInHeredoc.
 Layout/TrailingWhitespace:
@@ -226,7 +201,8 @@ Lint/UnderscorePrefixedVariableName:
 
 # Offense count: 1
 # This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AutoCorrect, AllowUnusedKeywordArguments, IgnoreEmptyMethods, IgnoreNotImplementedMethods.
+# Configuration parameters: AutoCorrect, AllowUnusedKeywordArguments, IgnoreEmptyMethods, IgnoreNotImplementedMethods, NotImplementedExceptions.
+# NotImplementedExceptions: NotImplementedError
 Lint/UnusedMethodArgument:
   Exclude:
     - 'lib/patches/mapper.rb'
@@ -254,7 +230,7 @@ Naming/VariableNumber:
   Exclude:
     - 'spec/dummy/app/controllers/inertia_test_controller.rb'
 
-# Offense count: 21
+# Offense count: 25
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, AllowedMethods, AllowedPatterns, AllowBracesOnProceduralOneLiners, BracesRequiredMethods.
 # SupportedStyles: line_count_based, semantic, braces_for_chaining, always_braces
@@ -263,11 +239,9 @@ Naming/VariableNumber:
 # AllowedMethods: lambda, proc, it
 Style/BlockDelimiters:
   Exclude:
-    - 'lib/inertia_rails/configuration.rb'
     - 'lib/inertia_rails/controller.rb'
     - 'spec/inertia/action_filter_spec.rb'
     - 'spec/inertia/conditional_sharing_spec.rb'
-    - 'spec/inertia/configuration_spec.rb'
     - 'spec/inertia/rendering_spec.rb'
     - 'spec/inertia/request_spec.rb'
     - 'spec/inertia/rspec_helper_spec.rb'
@@ -331,12 +305,13 @@ Style/ExpandPathArguments:
   Exclude:
     - 'spec/rails_helper.rb'
 
-# Offense count: 74
+# Offense count: 71
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: EnforcedStyle.
 # SupportedStyles: always, always_true, never
 Style/FrozenStringLiteralComment:
   Exclude:
+    - '**/*.arb'
     - 'app/controllers/inertia_rails/static_controller.rb'
     - 'bin/console'
     - 'lib/inertia_rails.rb'
@@ -344,7 +319,6 @@ Style/FrozenStringLiteralComment:
     - 'lib/inertia_rails/engine.rb'
     - 'lib/inertia_rails/helper.rb'
     - 'lib/inertia_rails/inertia_rails.rb'
-    - 'lib/inertia_rails/middleware.rb'
     - 'lib/inertia_rails/rspec.rb'
     - 'lib/inertia_rails/version.rb'
     - 'lib/patches/better_errors.rb'
@@ -396,7 +370,6 @@ Style/FrozenStringLiteralComment:
     - 'spec/inertia/always_prop_spec.rb'
     - 'spec/inertia/base_prop_spec.rb'
     - 'spec/inertia/conditional_sharing_spec.rb'
-    - 'spec/inertia/configuration_spec.rb'
     - 'spec/inertia/error_sharing_spec.rb'
     - 'spec/inertia/lazy_prop_spec.rb'
     - 'spec/inertia/middleware_spec.rb'
@@ -409,7 +382,6 @@ Style/FrozenStringLiteralComment:
     - 'spec/inertia/ssr_spec.rb'
     - 'spec/rails_helper.rb'
     - 'spec/spec_helper.rb'
-    - 'spec/support/helper_module.rb'
     - 'spec/support/shared_examples.rb'
 
 # Offense count: 1
@@ -424,13 +396,6 @@ Style/GlobalVars:
   Exclude:
     - 'spec/inertia/rspec_helper_spec.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: MinBodyLength, AllowConsecutiveConditionals.
-Style/GuardClause:
-  Exclude:
-    - 'lib/inertia_rails/configuration.rb'
-
 # Offense count: 1
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, EnforcedShorthandSyntax, UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
@@ -440,11 +405,10 @@ Style/HashSyntax:
   Exclude:
     - 'lib/tasks/inertia_rails.rake'
 
-# Offense count: 6
+# Offense count: 5
 # This cop supports safe autocorrection (--autocorrect).
 Style/IfUnlessModifier:
   Exclude:
-    - 'lib/inertia_rails/configuration.rb'
     - 'lib/inertia_rails/controller.rb'
     - 'lib/patches/better_errors.rb'
     - 'lib/patches/debug_exceptions/patch-5-0.rb'
@@ -457,12 +421,6 @@ Style/IfUnlessModifierOfIfUnless:
   Exclude:
     - 'lib/inertia_rails/controller.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Style/KeywordArgumentsMerging:
-  Exclude:
-    - 'lib/inertia_rails/configuration.rb'
-
 # Offense count: 3
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle.
@@ -479,12 +437,6 @@ Style/MapToSet:
   Exclude:
     - 'lib/inertia_rails/action_filter.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Style/MultilineIfModifier:
-  Exclude:
-    - 'lib/inertia_rails/configuration.rb'
-
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: EnforcedStyle.
@@ -493,7 +445,7 @@ Style/MutableConstant:
   Exclude:
     - 'lib/inertia_rails/version.rb'
 
-# Offense count: 1
+# Offense count: 2
 # This cop supports safe autocorrection (--autocorrect).
 Style/NegatedIfElseCondition:
   Exclude:
@@ -558,7 +510,7 @@ Style/SoleNestedConditional:
   Exclude:
     - 'lib/inertia_rails/controller.rb'
 
-# Offense count: 90
+# Offense count: 82
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
 # SupportedStyles: single_quotes, double_quotes
@@ -580,15 +532,12 @@ Style/StringLiterals:
     - 'spec/dummy/app/controllers/inertia_config_test_controller.rb'
     - 'spec/dummy/app/controllers/inertia_lambda_shared_props_controller.rb'
     - 'spec/dummy/app/controllers/inertia_rails_mimic_controller.rb'
-    - 'spec/dummy/app/controllers/inertia_render_test_controller.rb'
     - 'spec/dummy/config/application.rb'
     - 'spec/dummy/config/environments/production.rb'
     - 'spec/dummy/config/puma.rb'
     - 'spec/dummy/config/routes.rb'
     - 'spec/dummy/config/spring.rb'
     - 'spec/inertia/conditional_sharing_spec.rb'
-    - 'spec/inertia/configuration_spec.rb'
-    - 'spec/inertia/rendering_spec.rb'
     - 'spec/inertia/response_spec.rb'
     - 'spec/inertia/rspec_helper_spec.rb'
     - 'spec/rails_helper.rb'
@@ -610,23 +559,21 @@ Style/SymbolArray:
   EnforcedStyle: percent
   MinSize: 3
 
-# Offense count: 16
+# Offense count: 14
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyleForMultiline.
 # SupportedStylesForMultiline: comma, consistent_comma, no_comma
 Style/TrailingCommaInArguments:
   Exclude:
     - 'lib/inertia_rails.rb'
-    - 'lib/inertia_rails/renderer.rb'
     - 'spec/dummy/app/controllers/inertia_config_test_controller.rb'
     - 'spec/dummy/app/controllers/inertia_rails_mimic_controller.rb'
-    - 'spec/inertia/configuration_spec.rb'
     - 'spec/inertia/rendering_spec.rb'
 
-# Offense count: 21
+# Offense count: 22
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyleForMultiline.
-# SupportedStylesForMultiline: comma, consistent_comma, no_comma
+# SupportedStylesForMultiline: comma, consistent_comma, diff_comma, no_comma
 Style/TrailingCommaInHashLiteral:
   Exclude:
     - 'lib/inertia_rails/rspec.rb'
@@ -639,17 +586,18 @@ Style/TrailingCommaInHashLiteral:
     - 'spec/inertia/response_spec.rb'
     - 'spec/inertia/rspec_helper_spec.rb'
 
-# Offense count: 1
+# Offense count: 2
 # This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: WordRegex.
+# Configuration parameters: EnforcedStyle, MinSize, WordRegex.
 # SupportedStyles: percent, brackets
 Style/WordArray:
-  EnforcedStyle: percent
-  MinSize: 4
+  Exclude:
+    - 'lib/inertia_rails/middleware.rb'
+    - 'spec/inertia/rendering_spec.rb'
 
-# Offense count: 21
+# Offense count: 26
 # This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, AllowedPatterns.
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, AllowedPatterns, SplitStrings.
 # URISchemes: http, https
 Layout/LineLength:
-  Max: 290
+  Max: 276
diff --git a/lib/inertia_rails/configuration.rb b/lib/inertia_rails/configuration.rb
index 9e39ed3d..4c258e83 100644
--- a/lib/inertia_rails/configuration.rb
+++ b/lib/inertia_rails/configuration.rb
@@ -29,6 +29,23 @@ class Configuration
 
     OPTION_NAMES = DEFAULTS.keys.freeze
 
+    class << self
+      def default
+        new(**DEFAULTS, **env_options)
+      end
+
+      private
+
+      def env_options
+        DEFAULTS.keys.each_with_object({}) do |key, hash|
+          value = ENV.fetch("INERTIA_#{key.to_s.upcase}", nil)
+          next if value.nil?
+
+          hash[key] = %w[true false].include?(value) ? value == 'true' : value
+        end
+      end
+    end
+
     protected attr_reader :controller
     protected attr_reader :options
 
@@ -36,9 +53,9 @@ def initialize(controller: nil, **attrs)
       @controller = controller
       @options = attrs.extract!(*OPTION_NAMES)
 
-      unless attrs.empty?
-        raise ArgumentError, "Unknown options for #{self.class}: #{attrs.keys}"
-      end
+      return if attrs.empty?
+
+      raise ArgumentError, "Unknown options for #{self.class}: #{attrs.keys}"
     end
 
     def bind_controller(controller)
@@ -56,7 +73,7 @@ def merge!(config)
     end
 
     def merge(config)
-      Configuration.new(**@options.merge(config.options))
+      Configuration.new(**@options, **config.options)
     end
 
     # Internal: Finalizes the configuration for a specific controller.
@@ -70,23 +87,22 @@ def component_path_resolver(path:, action:)
     end
 
     OPTION_NAMES.each do |option|
-      define_method(option) {
-        evaluate_option @options[option]
-      } unless method_defined?(option)
-      define_method("#{option}=") { |value|
+      unless method_defined?(option)
+        define_method(option) do
+          evaluate_option options[option]
+        end
+      end
+      define_method("#{option}=") do |value|
         @options[option] = value
-      }
-    end
-
-    def self.default
-      new(**DEFAULTS)
+      end
     end
 
-  private
+    private
 
     def evaluate_option(value)
       return value unless value.respond_to?(:call)
       return value.call unless controller
+
       controller.instance_exec(&value)
     end
   end
diff --git a/lib/inertia_rails/renderer.rb b/lib/inertia_rails/renderer.rb
index f556a7b4..9d9f69d7 100644
--- a/lib/inertia_rails/renderer.rb
+++ b/lib/inertia_rails/renderer.rb
@@ -60,7 +60,7 @@ def render_ssr
 
     def layout
       layout = configuration.layout
-      layout.nil? ? true : layout
+      layout.nil? || layout
     end
 
     def shared_data
diff --git a/spec/inertia/configuration_spec.rb b/spec/inertia/configuration_spec.rb
index 6d0b251c..54628853 100644
--- a/spec/inertia/configuration_spec.rb
+++ b/spec/inertia/configuration_spec.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 RSpec.describe 'Inertia configuration', type: :request do
   after { reset_config! }
 
-  describe "InertiaRails::Configuration" do
-    it "does not allow to modify options after frozen" do
+  describe 'InertiaRails::Configuration' do
+    it 'does not allow to modify options after frozen' do
       config = InertiaRails::Configuration.default
       config.ssr_enabled = true
       expect(config.ssr_enabled).to eq true
@@ -11,26 +13,64 @@
       expect { config.ssr_enabled = false }.to raise_error(FrozenError)
       expect { config.merge!(InertiaRails::Configuration.default) }.to raise_error(FrozenError)
 
-      expect {
+      expect do
         merged_config = config.merge(InertiaRails::Configuration.default)
         expect(merged_config.ssr_enabled).to eq false
-      }.not_to raise_error
+      end.not_to raise_error
+    end
+
+    context 'with environment variables' do
+      it 'always prioritizes initialized variables' do
+        with_env(
+          'INERTIA_SSR_ENABLED' => 'true',
+          'INERTIA_SSR_URL' => 'http://env-ssr-url:1234',
+          'INERTIA_DEEP_MERGE_SHARED_DATA' => 'true'
+        ) do
+          config = InertiaRails::Configuration.default
+
+          config.ssr_enabled = false
+
+          expect(config.ssr_enabled).to eq false
+          expect(config.ssr_url).to eq 'http://env-ssr-url:1234'
+          expect(config.deep_merge_shared_data).to eq true
+        end
+      end
+
+      it 'respects environment variables when merging defaults' do
+        with_env(
+          'INERTIA_SSR_ENABLED' => 'true'
+        ) do
+          config = InertiaRails::Configuration.default
+          config.deep_merge_shared_data = true
+
+          controller_config = InertiaRails::Configuration.new(ssr_url: 'http://ssr-url:1234')
+          controller_config.with_defaults(config)
+
+          expect(controller_config.ssr_enabled).to eq true
+          expect(controller_config.ssr_url).to eq 'http://ssr-url:1234'
+          expect(controller_config.deep_merge_shared_data).to eq true
+        end
+      end
     end
   end
 
   describe 'inertia_config' do
-    it 'overrides the global values' do
-      get configuration_path
-
-      expect(response.parsed_body.symbolize_keys).to include(
-        deep_merge_shared_data: true,
-        default_render: false,
-        layout: "test",
-        ssr_enabled: true,
-        ssr_url: "http://localhost:7777",
-        version: "2.0",
-        encrypt_history: false,
-      )
+    it 'overrides the global values and ENV' do
+      with_env(
+        'INERTIA_SSR_URL' => 'http://env-ssr-url:1234'
+      ) do
+        get configuration_path
+
+        expect(response.parsed_body.symbolize_keys).to include(
+          deep_merge_shared_data: true,
+          default_render: false,
+          layout: 'test',
+          ssr_enabled: true,
+          ssr_url: 'http://localhost:7777',
+          version: '2.0',
+          encrypt_history: false
+        )
+      end
     end
   end
 
@@ -38,15 +78,15 @@
     subject { JSON.parse(response.body)['version'] }
 
     context 'base case' do
-      before { get empty_test_path, headers: {'X-Inertia' => true} }
+      before { get empty_test_path, headers: { 'X-Inertia' => true } }
 
       it { is_expected.to be_nil }
     end
 
     context 'version is a string' do
       before do
-         InertiaRails.configure {|c| c.version = '1.0'}
-         get empty_test_path, headers: {'X-Inertia' => true, 'HTTP_X_INERTIA_VERSION' => '1.0'}
+        InertiaRails.configure { |c| c.version = '1.0' }
+        get empty_test_path, headers: { 'X-Inertia' => true, 'HTTP_X_INERTIA_VERSION' => '1.0' }
       end
 
       it { is_expected.to eq '1.0' }
@@ -54,8 +94,8 @@
 
     context 'version is a callable' do
       before do
-        InertiaRails.configure {|c| c.version = -> {'1.0'}}
-        get empty_test_path, headers: {'X-Inertia' => true, 'X-Inertia-Version' => '1.0'}
+        InertiaRails.configure { |c| c.version = -> { '1.0' } }
+        get empty_test_path, headers: { 'X-Inertia' => true, 'X-Inertia-Version' => '1.0' }
       end
 
       it { is_expected.to eq '1.0' }
@@ -63,8 +103,8 @@
 
     context 'string vs float mismatches' do
       before do
-        InertiaRails.configure {|c| c.version = 1.0}
-        get empty_test_path, headers: {'X-Inertia' => true, 'X-Inertia-Version' => '1.0'}
+        InertiaRails.configure { |c| c.version = 1.0 }
+        get empty_test_path, headers: { 'X-Inertia' => true, 'X-Inertia-Version' => '1.0' }
       end
 
       it { is_expected.to eq 1.0 }
@@ -77,7 +117,7 @@
 
       context 'request in same thread' do
         before do
-          get empty_test_path, headers: {'X-Inertia' => true, 'X-Inertia-Version' => '1.0'}
+          get empty_test_path, headers: { 'X-Inertia' => true, 'X-Inertia-Version' => '1.0' }
         end
 
         it { is_expected.to eq '1.0' }
@@ -86,7 +126,7 @@
       context 'request in other thread' do
         before do
           Thread.new do
-            get empty_test_path, headers: {'X-Inertia' => true, 'X-Inertia-Version' => '1.0'}
+            get empty_test_path, headers: { 'X-Inertia' => true, 'X-Inertia-Version' => '1.0' }
           end.join
         end
 
@@ -107,7 +147,7 @@
 
     context 'with a new layout' do
       before do
-        InertiaRails.configure {|c| c.layout = 'testing' }
+        InertiaRails.configure { |c| c.layout = 'testing' }
       end
 
       context 'request in same thread' do
@@ -134,7 +174,7 @@
 
       context 'opting out of a different layout for Inertia' do
         before do
-          InertiaRails.configure {|c| c.layout = true }
+          InertiaRails.configure { |c| c.layout = true }
         end
 
         it 'uses default layout for controller' do
diff --git a/spec/support/helper_module.rb b/spec/support/helper_module.rb
index 2ea3d6c2..f0521659 100644
--- a/spec/support/helper_module.rb
+++ b/spec/support/helper_module.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HelperModule
   def with_forgery_protection
     orig = ActionController::Base.allow_forgery_protection
@@ -8,4 +10,14 @@ def with_forgery_protection
       ActionController::Base.allow_forgery_protection = orig
     end
   end
+
+  def with_env(**env)
+    orig = ENV.to_h
+    begin
+      ENV.replace(env)
+      yield if block_given?
+    ensure
+      ENV.replace(orig)
+    end
+  end
 end