diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 5e87737a2cef2..f4f98901d1273 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,16 @@
+*   Remove deprecated support to call the following methods without passing a deprecator:
+
+    - `deprecate`
+    - `deprecate_constant`
+    - `ActiveSupport::Deprecation::DeprecatedObjectProxy.new`
+    - `ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new`
+    - `ActiveSupport::Deprecation::DeprecatedConstantProxy.new`
+    - `assert_deprecated`
+    - `assert_not_deprecated`
+    - `collect_deprecations`
+
+    *Rafael Mendonça França*
+
 *   Remove deprecated `ActiveSupport::Deprecation` delegation to instance.
 
     *Rafael Mendonça França*
diff --git a/activesupport/lib/active_support/core_ext/module/deprecation.rb b/activesupport/lib/active_support/core_ext/module/deprecation.rb
index 596001f1cdab4..420311b3a6dd1 100644
--- a/activesupport/lib/active_support/core_ext/module/deprecation.rb
+++ b/activesupport/lib/active_support/core_ext/module/deprecation.rb
@@ -14,15 +14,12 @@ class Module
   #       Kernel.warn message
   #     end
   #   end
-  def deprecate(*method_names, deprecator: nil, **options)
+  def deprecate(*method_names, deprecator:, **options)
     if deprecator.is_a?(ActiveSupport::Deprecation)
       deprecator.deprecate_methods(self, *method_names, **options)
     elsif deprecator
       # we just need any instance to call deprecate_methods, but the deprecation will be emitted by deprecator
       ActiveSupport.deprecator.deprecate_methods(self, *method_names, **options, deprecator: deprecator)
-    else
-      ActiveSupport.deprecator.warn("Module.deprecate without a deprecator is deprecated")
-      ActiveSupport::Deprecation._instance.deprecate_methods(self, *method_names, **options)
     end
   end
 end
diff --git a/activesupport/lib/active_support/deprecation/constant_accessor.rb b/activesupport/lib/active_support/deprecation/constant_accessor.rb
index 73e2a190e72e8..8763c6d5a6c84 100644
--- a/activesupport/lib/active_support/deprecation/constant_accessor.rb
+++ b/activesupport/lib/active_support/deprecation/constant_accessor.rb
@@ -39,9 +39,7 @@ def const_missing(missing_const_name)
             super
           end
 
-          def deprecate_constant(const_name, new_constant, message: nil, deprecator: nil)
-            ActiveSupport.deprecator.warn("DeprecatedConstantAccessor.deprecate_constant without a deprecator is deprecated") unless deprecator
-            deprecator ||= ActiveSupport::Deprecation._instance
+          def deprecate_constant(const_name, new_constant, deprecator:, message: nil)
             class_variable_set(:@@_deprecated_constants, {}) unless class_variable_defined?(:@@_deprecated_constants)
             class_variable_get(:@@_deprecated_constants)[const_name.to_s] = { new: new_constant, message: message, deprecator: deprecator }
           end
diff --git a/activesupport/lib/active_support/deprecation/proxy_wrappers.rb b/activesupport/lib/active_support/deprecation/proxy_wrappers.rb
index e6f8e5a593a56..80e4ab22459fe 100644
--- a/activesupport/lib/active_support/deprecation/proxy_wrappers.rb
+++ b/activesupport/lib/active_support/deprecation/proxy_wrappers.rb
@@ -3,7 +3,7 @@
 module ActiveSupport
   class Deprecation
     class DeprecationProxy # :nodoc:
-      def self.new(*args, &block)
+      def self.new(*args, **kwargs, &block)
         object = args.first
 
         return object unless object
@@ -36,11 +36,10 @@ def method_missing(called, *args, &block)
     #   (Backtrace)
     #   # => "#<Object:0x007fb9b34c34b0>"
     class DeprecatedObjectProxy < DeprecationProxy
-      def initialize(object, message, deprecator = nil)
+      def initialize(object, message, deprecator)
         @object = object
         @message = message
-        ActiveSupport.deprecator.warn("DeprecatedObjectProxy without a deprecator is deprecated") unless deprecator
-        @deprecator = deprecator || ActiveSupport::Deprecation._instance
+        @deprecator = deprecator
       end
 
       private
@@ -86,12 +85,11 @@ def warn(callstack, called, args)
     #   example.request.to_s
     #   # => "special_request"
     class DeprecatedInstanceVariableProxy < DeprecationProxy
-      def initialize(instance, method, var = "@#{method}", deprecator = nil)
+      def initialize(instance, method, var = "@#{method}", deprecator:)
         @instance = instance
         @method = method
         @var = var
-        ActiveSupport.deprecator.warn("DeprecatedInstanceVariableProxy without a deprecator is deprecated") unless deprecator
-        @deprecator = deprecator || ActiveSupport::Deprecation._instance
+        @deprecator = deprecator
       end
 
       private
@@ -127,13 +125,12 @@ def self.new(*args, **options, &block)
         super
       end
 
-      def initialize(old_const, new_const, deprecator = nil, message: "#{old_const} is deprecated! Use #{new_const} instead.")
+      def initialize(old_const, new_const, deprecator, message: "#{old_const} is deprecated! Use #{new_const} instead.")
         Kernel.require "active_support/inflector/methods"
 
         @old_const = old_const
         @new_const = new_const
-        ActiveSupport.deprecator.warn("DeprecatedConstantProxy without a deprecator is deprecated") unless deprecator
-        @deprecator = deprecator || ActiveSupport::Deprecation._instance
+        @deprecator = deprecator
         @message = message
       end
 
diff --git a/activesupport/lib/active_support/testing/deprecation.rb b/activesupport/lib/active_support/testing/deprecation.rb
index 073300bb81fdc..ea307a0b84c22 100644
--- a/activesupport/lib/active_support/testing/deprecation.rb
+++ b/activesupport/lib/active_support/testing/deprecation.rb
@@ -29,10 +29,11 @@ module Deprecation
       #   end
       def assert_deprecated(match = nil, deprecator = nil, &block)
         match, deprecator = nil, match if match.is_a?(ActiveSupport::Deprecation)
+
         unless deprecator
-          ActiveSupport.deprecator.warn("assert_deprecated without a deprecator is deprecated")
-          deprecator = ActiveSupport::Deprecation._instance
+          raise ArgumentError, "No deprecator given"
         end
+
         result, warnings = collect_deprecations(deprecator, &block)
         assert !warnings.empty?, "Expected a deprecation warning within the block but received none"
         if match
@@ -51,11 +52,7 @@ def assert_deprecated(match = nil, deprecator = nil, &block)
       #   assert_not_deprecated(ActiveSupport::Deprecation.new) do
       #     CustomDeprecator.warn "message" # passes assertion, different deprecator
       #   end
-      def assert_not_deprecated(deprecator = nil, &block)
-        unless deprecator
-          ActiveSupport.deprecator.warn("assert_not_deprecated without a deprecator is deprecated")
-          deprecator = ActiveSupport::Deprecation._instance
-        end
+      def assert_not_deprecated(deprecator, &block)
         result, deprecations = collect_deprecations(deprecator, &block)
         assert deprecations.empty?, "Expected no deprecation warning within the block but received #{deprecations.size}: \n  #{deprecations * "\n  "}"
         result
@@ -69,11 +66,7 @@ def assert_not_deprecated(deprecator = nil, &block)
       #     ActiveSupport::Deprecation.new.warn "other message"
       #     :result
       #   end # => [:result, ["message"]]
-      def collect_deprecations(deprecator = nil)
-        unless deprecator
-          ActiveSupport.deprecator.warn("collect_deprecations without a deprecator is deprecated")
-          deprecator = ActiveSupport::Deprecation._instance
-        end
+      def collect_deprecations(deprecator)
         old_behavior = deprecator.behavior
         deprecations = []
         deprecator.behavior = Proc.new do |message, callstack|
diff --git a/activesupport/test/deprecation_test.rb b/activesupport/test/deprecation_test.rb
index 26ca84ba3e2f5..acf6816cd6980 100644
--- a/activesupport/test/deprecation_test.rb
+++ b/activesupport/test/deprecation_test.rb
@@ -47,8 +47,8 @@ def setup
     end
   end
 
-  test "assert_deprecated is deprecated without a deprecator" do
-    assert_deprecated(ActiveSupport.deprecator) do
+  test "assert_deprecated requires a deprecator" do
+    assert_raises(ArgumentError) do
       assert_deprecated do
         ActiveSupport::Deprecation._instance.warn
       end
@@ -61,8 +61,8 @@ def setup
     end
   end
 
-  test "assert_not_deprecated is deprecated without a deprecator" do
-    assert_deprecated(ActiveSupport.deprecator) do
+  test "assert_not_deprecated requires a deprecator" do
+    assert_raises(ArgumentError) do
       assert_not_deprecated { }
     end
   end
@@ -77,8 +77,8 @@ def setup
     assert_match "DEPRECATION WARNING:", result.last.sole
   end
 
-  test "collect_deprecations is deprecated without a deprecator" do
-    assert_deprecated(ActiveSupport.deprecator) do
+  test "collect_deprecations requires a deprecator" do
+    assert_raises(ArgumentError) do
       collect_deprecations { }
     end
   end
@@ -116,15 +116,11 @@ def setup
     end
   end
 
-  test "Module::deprecate without a deprecator is deprecated" do
+  test "Module::deprecate requires a deprecator" do
     klass = Class.new(Deprecatee)
-    _, deprecations = collect_deprecations(ActiveSupport.deprecator) do
+    assert_raises(ArgumentError) do
       klass.deprecate :zero
     end
-    assert_match "Module.deprecate without a deprecator is deprecated", deprecations.sole
-    assert_deprecated(/zero is deprecated/, ActiveSupport::Deprecation._instance) do
-      klass.new.zero
-    end
   end
 
   test "DeprecatedObjectProxy" do
@@ -132,8 +128,8 @@ def setup
     assert_deprecated(/:bomb:/, @deprecator) { deprecated_object.to_s }
   end
 
-  test "DeprecatedObjectProxy without a deprecator is deprecated" do
-    assert_deprecated(ActiveSupport.deprecator) do
+  test "DeprecatedObjectProxy requires a deprecator" do
+    assert_raises(ArgumentError) do
       ActiveSupport::Deprecation::DeprecatedObjectProxy.new(Object.new, ":bomb:")
     end
   end
@@ -302,7 +298,7 @@ def setup
 
   test "DeprecatedInstanceVariableProxy" do
     instance = Deprecatee.new
-    instance.fubar = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(instance, :foo_bar, "@fubar", @deprecator)
+    instance.fubar = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(instance, :foo_bar, "@fubar", deprecator: @deprecator)
     instance.foo_bar = "foo bar!"
 
     fubar_size = assert_deprecated("@fubar.size", @deprecator) { instance.fubar.size }
@@ -314,15 +310,15 @@ def setup
 
   test "DeprecatedInstanceVariableProxy does not warn on inspect" do
     instance = Deprecatee.new
-    instance.fubar = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(instance, :foo_bar, "@fubar", @deprecator)
+    instance.fubar = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(instance, :foo_bar, "@fubar", deprecator: @deprecator)
     instance.foo_bar = "foo bar!"
 
     fubar_inspected = assert_not_deprecated(@deprecator) { instance.fubar.inspect }
     assert_equal instance.foo_bar.inspect, fubar_inspected
   end
 
-  test "DeprecatedInstanceVariableProxy without a deprecator is deprecated" do
-    assert_deprecated(ActiveSupport.deprecator) do
+  test "DeprecatedInstanceVariableProxy requires a deprecator" do
+    assert_raises(ArgumentError) do
       ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(Deprecatee.new, :foobar, "@fubar")
     end
   end
@@ -354,8 +350,8 @@ def setup
     end
   end
 
-  test "DeprecatedConstantProxy without a deprecator is deprecated" do
-    assert_deprecated(ActiveSupport.deprecator) do
+  test "DeprecatedConstantProxy requires a deprecator" do
+    assert_raise(ArgumentError) do
       ActiveSupport::Deprecation::DeprecatedConstantProxy.new("Fuu", "Undeprecated::Foo")
     end
   end
@@ -383,9 +379,9 @@ def setup
     end
   end
 
-  test "deprecate_constant is deprecated without a deprecator" do
+  test "deprecate_constant requires a deprecator" do
     legacy = Module.new.include(ActiveSupport::Deprecation::DeprecatedConstantAccessor)
-    assert_deprecated("DeprecatedConstantAccessor.deprecate_constant without a deprecator is deprecated", ActiveSupport.deprecator) do
+    assert_raises(ArgumentError) do
       legacy.deprecate_constant "OLD", "NEW"
     end
   end
diff --git a/guides/source/7_0_release_notes.md b/guides/source/7_0_release_notes.md
index 32eaf303c333f..6b91aff5d8791 100644
--- a/guides/source/7_0_release_notes.md
+++ b/guides/source/7_0_release_notes.md
@@ -269,6 +269,17 @@ Please refer to the [Changelog][active-support] for detailed changes.
 
 ### Removals
 
+*   Remove deprecated support to call the following methods without passing a deprecator:
+
+    - `deprecate`
+    - `deprecate_constant`
+    - `ActiveSupport::Deprecation::DeprecatedObjectProxy.new`
+    - `ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new`
+    - `ActiveSupport::Deprecation::DeprecatedConstantProxy.new`
+    - `assert_deprecated`
+    - `assert_not_deprecated`
+    - `collect_deprecations`
+
 *   Remove deprecated `config.active_support.use_sha1_digests`.
 
 *   Remove deprecated `URI.parser`.