diff --git a/lib/rubocop/ast.rb b/lib/rubocop/ast.rb
index fee3d5f23..59ec61ea5 100644
--- a/lib/rubocop/ast.rb
+++ b/lib/rubocop/ast.rb
@@ -5,7 +5,6 @@
 require 'set'
 
 require_relative 'ast/ext/range'
-require_relative 'ast/ext/range_min_max'
 require_relative 'ast/node_pattern/method_definer'
 require_relative 'ast/node_pattern'
 require_relative 'ast/node/mixin/descendence'
diff --git a/lib/rubocop/ast/ext/range_min_max.rb b/lib/rubocop/ast/ext/range_min_max.rb
deleted file mode 100644
index 08e2d322c..000000000
--- a/lib/rubocop/ast/ext/range_min_max.rb
+++ /dev/null
@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-module RuboCop
-  module AST
-    module Ext
-      # Refinement to circumvent broken `Range#minmax` for infinity ranges in 2.6-
-      module RangeMinMax
-        if ::Range.instance_method(:minmax).owner != ::Range
-          refine ::Range do
-            def minmax
-              [min, max]
-            end
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/lib/rubocop/ast/node_pattern/node.rb b/lib/rubocop/ast/node_pattern/node.rb
index b02af25a9..d98709fcb 100644
--- a/lib/rubocop/ast/node_pattern/node.rb
+++ b/lib/rubocop/ast/node_pattern/node.rb
@@ -7,7 +7,6 @@ class NodePattern
       class Node < ::Parser::AST::Node
         extend Forwardable
         include ::RuboCop::AST::Descendence
-        using Ext::RangeMinMax
 
         MATCHES_WITHIN_SET = %i[symbol number string].to_set.freeze
         private_constant :MATCHES_WITHIN_SET