diff --git a/activesupport/test/descendants_tracker_test_cases.rb b/activesupport/test/descendants_tracker_test_cases.rb
index 09c5ce1f07a25fb5c34a2f0cbe407f22b9952413..cf349d53ee4a89ae79d3f8af2931a6d2df417584 100644
--- a/activesupport/test/descendants_tracker_test_cases.rb
+++ b/activesupport/test/descendants_tracker_test_cases.rb
@@ -40,7 +40,7 @@ def test_clear
     end
   end
 
-  protected
+  private
 
     def assert_equal_sets(expected, actual)
       assert_equal Set.new(expected), Set.new(actual)
diff --git a/activesupport/test/json/encoding_test.rb b/activesupport/test/json/encoding_test.rb
index fa518104c2ce2e6e51ed60fa38419930bbf4c00f..8893b9d4756087a46f5945910ebcbd98c65ee97f 100644
--- a/activesupport/test/json/encoding_test.rb
+++ b/activesupport/test/json/encoding_test.rb
@@ -452,7 +452,7 @@ def test_to_json_works_when_as_json_returns_NaN_number
     assert_equal '{"number":null}', NaNNumber.new.to_json
   end
 
-  protected
+  private
 
     def object_keys(json_object)
       json_object[1..-2].scan(/([^{}:,\s]+):/).flatten.sort
diff --git a/activesupport/test/multibyte_conformance_test.rb b/activesupport/test/multibyte_conformance_test.rb
index bf004d7924af54f75f55e8347569db6cd456c3d1..ef1a26135f296c53140de6f6ea130b751c39915c 100644
--- a/activesupport/test/multibyte_conformance_test.rb
+++ b/activesupport/test/multibyte_conformance_test.rb
@@ -82,7 +82,7 @@ def test_normalizations_KD
     end
   end
 
-  protected
+  private
     def each_line_of_norm_tests(&block)
       File.open(File.join(CACHE_DIR, UNIDATA_FILE), "r") do | f |
         until f.eof?
diff --git a/activesupport/test/multibyte_grapheme_break_conformance_test.rb b/activesupport/test/multibyte_grapheme_break_conformance_test.rb
index 04a7d290d996494c58a10541cf719037f775cd4b..b3328987aedb28aa7db8434a94f1c9e4a8b07050 100644
--- a/activesupport/test/multibyte_grapheme_break_conformance_test.rb
+++ b/activesupport/test/multibyte_grapheme_break_conformance_test.rb
@@ -28,7 +28,7 @@ def test_breaks
     end
   end
 
-  protected
+  private
     def each_line_of_break_tests(&block)
       lines = 0
       max_test_lines = 0 # Don't limit below 21, because that's the header of the testfile
diff --git a/activesupport/test/multibyte_normalization_conformance_test.rb b/activesupport/test/multibyte_normalization_conformance_test.rb
index e013bd578f35cadc6b6f16909e169bdf1ed26a58..ebc9f92d23ce2886ad9e414a24a8c93da8a6a668 100644
--- a/activesupport/test/multibyte_normalization_conformance_test.rb
+++ b/activesupport/test/multibyte_normalization_conformance_test.rb
@@ -83,7 +83,7 @@ def test_normalizations_KD
     end
   end
 
-  protected
+  private
     def each_line_of_norm_tests(&block)
       lines = 0
       max_test_lines = 0 # Don't limit below 38, because that's the header of the testfile
diff --git a/activesupport/test/notifications_test.rb b/activesupport/test/notifications_test.rb
index a6f0d82e8aa48e1c219e4a053ef95c0c2be48f42..11f743519f7a3be03d64221d18c01a1c6ddaae6a 100644
--- a/activesupport/test/notifications_test.rb
+++ b/activesupport/test/notifications_test.rb
@@ -273,7 +273,7 @@ def test_event_is_parent_based_on_children
       assert !not_child.parent_of?(parent)
     end
 
-    protected
+    private
       def random_id
         @random_id ||= SecureRandom.hex(10)
       end
diff --git a/activesupport/test/test_case_test.rb b/activesupport/test/test_case_test.rb
index d769a8c14560de2908b0175d8b9662a812c8488c..af7fc44d6633aa69e1d0e408065a3e2689236fd7 100644
--- a/activesupport/test/test_case_test.rb
+++ b/activesupport/test/test_case_test.rb
@@ -257,7 +257,7 @@ def setup
   def teardown
   end
 
-  protected
+  private
 
     def reset_callback_record
       @called_back = []
@@ -282,7 +282,7 @@ def test_inherited_setup_callbacks
     assert_equal [:foo, :sentinel, :bar], self.class._teardown_callbacks.map(&:raw_filter)
   end
 
-  protected
+  private
     def bar
       @called_back << :bar
     end