diff --git a/benchmark/unicode_normalize.rb b/benchmark/unicode_normalize.rb
index 760f249f..967f7bb5 100644
--- a/benchmark/unicode_normalize.rb
+++ b/benchmark/unicode_normalize.rb
@@ -2,7 +2,7 @@
 # frozen_string_literal: true.
 
 require "benchmark"
-require "addressable/idna/pure.rb"
+require_relative "../lib/addressable/idna/pure.rb"
 require "idn"
 
 value = "fiﾯリ宠퐱卄.com"
diff --git a/lib/addressable/idna/native.rb b/lib/addressable/idna/native.rb
index b225e1c3..a718364f 100644
--- a/lib/addressable/idna/native.rb
+++ b/lib/addressable/idna/native.rb
@@ -29,6 +29,16 @@ def self.punycode_decode(value)
        IDN::Punycode.decode(value.to_s)
      end
 
+    class << self
+      # @deprecated Use {String#unicode_normalize(:nfkc)} instead
+      def unicode_normalize_kc(value)
+        value.to_s.unicode_normalize(:nfkc)
+      end
+
+      extend Gem::Deprecate
+      deprecate :unicode_normalize_kc, "String#unicode_normalize(:nfkc)", 2023, 4
+    end
+
     def self.to_ascii(value)
       value.to_s.split('.', -1).map do |segment|
         if segment.size > 0 && segment.size < 64
diff --git a/lib/addressable/idna/pure.rb b/lib/addressable/idna/pure.rb
index ae09ec66..3d6ffbad 100644
--- a/lib/addressable/idna/pure.rb
+++ b/lib/addressable/idna/pure.rb
@@ -112,6 +112,16 @@ def self.to_unicode(input)
       output
     end
 
+    class << self
+      # @deprecated Use {String#unicode_normalize(:nfkc)} instead
+      def unicode_normalize_kc(value)
+        value.to_s.unicode_normalize(:nfkc)
+      end
+
+      extend Gem::Deprecate
+      deprecate :unicode_normalize_kc, "String#unicode_normalize(:nfkc)", 2023, 4
+    end
+
     ##
     # Unicode aware downcase method.
     #