diff --git a/lib/csv/delete_suffix.rb b/lib/csv/delete_suffix.rb
deleted file mode 100644
index d4577189970198..00000000000000
--- a/lib/csv/delete_suffix.rb
+++ /dev/null
@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-# This provides String#delete_suffix? for Ruby 2.4.
-unless String.method_defined?(:delete_suffix)
-  class CSV
-    module DeleteSuffix
-      refine String do
-        def delete_suffix(suffix)
-          if end_with?(suffix)
-            self[0...-suffix.size]
-          else
-            self
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/lib/csv/match_p.rb b/lib/csv/match_p.rb
deleted file mode 100644
index 775559a3ebfbe6..00000000000000
--- a/lib/csv/match_p.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-# This provides String#match? and Regexp#match? for Ruby 2.3.
-unless String.method_defined?(:match?)
-  class CSV
-    module MatchP
-      refine String do
-        def match?(pattern)
-          self =~ pattern
-        end
-      end
-
-      refine Regexp do
-        def match?(string)
-          self =~ string
-        end
-      end
-    end
-  end
-end