diff --git a/lib/puppet/parser/functions/has_key.rb b/lib/puppet/parser/functions/has_key.rb
deleted file mode 100644
index 334b849f0..000000000
--- a/lib/puppet/parser/functions/has_key.rb
+++ /dev/null
@@ -1,41 +0,0 @@
-# frozen_string_literal: true
-
-#
-# has_key.rb
-#
-module Puppet::Parser::Functions
-  newfunction(:has_key, type: :rvalue, doc: <<-'DOC') do |args|
-    @summary
-      **Deprecated:** Determine if a hash has a certain key value.
-
-    @return
-      Boolean value
-
-    @example Example Usage:
-
-      $my_hash = {'key_one' => 'value_one'}
-      if has_key($my_hash, 'key_two') {
-        notice('we will not reach here')
-      }
-      if has_key($my_hash, 'key_one') {
-        notice('this will be printed')
-      }
-
-    > **Note:** **Deprecated** since Puppet 4.0.0, this can now be achieved in the Puppet
-    language with the following equivalent expression:
-    $my_hash = {'key_one' => 'value_one'}
-    if 'key_one' in $my_hash {
-      notice('this will be printed')
-    }
-
-    DOC
-
-    unless args.length == 2
-      raise Puppet::ParseError, "has_key(): wrong number of arguments (#{args.length}; must be 2)"
-    end
-    unless args[0].is_a?(Hash)
-      raise Puppet::ParseError, "has_key(): expects the first argument to be a hash, got #{args[0].inspect} which is of type #{args[0].class}"
-    end
-    args[0].key?(args[1])
-  end
-end
diff --git a/spec/functions/has_key_spec.rb b/spec/functions/has_key_spec.rb
deleted file mode 100644
index 882356171..000000000
--- a/spec/functions/has_key_spec.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe 'has_key' do
-  it { is_expected.not_to eq(nil) }
-  it { is_expected.to run.with_params.and_raise_error(Puppet::ParseError, %r{wrong number of arguments}i) }
-  it { is_expected.to run.with_params('one').and_raise_error(Puppet::ParseError, %r{wrong number of arguments}i) }
-  it { is_expected.to run.with_params('one', 'two', 'three').and_raise_error(Puppet::ParseError, %r{wrong number of arguments}i) }
-  it { is_expected.to run.with_params('one', 'two').and_raise_error(Puppet::ParseError, %r{expects the first argument to be a hash}) }
-  it { is_expected.to run.with_params(1, 'two').and_raise_error(Puppet::ParseError, %r{expects the first argument to be a hash}) }
-  it { is_expected.to run.with_params([], 'two').and_raise_error(Puppet::ParseError, %r{expects the first argument to be a hash}) }
-
-  it { is_expected.to run.with_params({ 'key' => 'value' }, 'key').and_return(true) }
-  it { is_expected.to run.with_params({}, 'key').and_return(false) }
-  it { is_expected.to run.with_params({ 'key' => 'value' }, 'not a key').and_return(false) }
-
-  context 'with UTF8 and double byte characters' do
-    it { is_expected.to run.with_params({ 'κéỳ ' => '٧ậļųể' }, 'κéỳ ').and_return(true) }
-    it { is_expected.to run.with_params({ 'キー' => '٧ậļųể' }, 'キー').and_return(true) }
-  end
-end