diff --git a/test/support/rails_7_patch.rb b/test/support/rails_7_patch.rb
new file mode 100644
index 00000000..b2cc74ab
--- /dev/null
+++ b/test/support/rails_7_patch.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+# HACK: to prevent the resetting of instance variables after each request in Rails 7
+# see https://github.com/rails/rails/pull/43735
+if Rails::VERSION::MAJOR >= 7
+  module ActionController
+    module Testing
+      module Functional
+        def clear_instance_variables_between_requests; end
+      end
+    end
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 7d8ca63e..00123504 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -49,6 +49,7 @@ end
 
 require 'support/rails_app'
 
+require 'support/rails_7_patch'
 require 'support/ruby_2_6_rails_4_2_patch'
 
 # require "rails/test_help"