diff --git a/test/json_gem/json_ext_parser_test.rb b/test/json_gem/json_ext_parser_test.rb
index 5238617e..53cf680e 100755
--- a/test/json_gem/json_ext_parser_test.rb
+++ b/test/json_gem/json_ext_parser_test.rb
@@ -9,13 +9,25 @@ class JSONExtParserTest < Test::Unit::TestCase
   include Test::Unit::TestCaseOmissionSupport
 
   if defined?(JSON::Ext::Parser)
-    def test_allocate
-      parser = JSON::Ext::Parser.new("{}")
-      assert_raise(TypeError, '[ruby-core:35079]') do
+    if REAL_JSON_GEM && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.5.0')
+      def test_allocate
+        parser = JSON::Ext::Parser.new("{}")
         parser.__send__(:initialize, "{}")
+        assert_equal "{}", parser.source
+
+        parser = JSON::Ext::Parser.allocate
+        assert_nil parser.source
+      end
+    else
+      # Ruby 3.4.x or before
+      def test_allocate
+        parser = JSON::Ext::Parser.new("{}")
+        assert_raise(TypeError, '[ruby-core:35079]') do
+          parser.__send__(:initialize, "{}")
+        end
+        parser = JSON::Ext::Parser.allocate
+        assert_raise(TypeError, '[ruby-core:35079]') { parser.source }
       end
-      parser = JSON::Ext::Parser.allocate
-      assert_raise(TypeError, '[ruby-core:35079]') { parser.source }
     end
   end
 end
diff --git a/test/json_gem/json_generator_test.rb b/test/json_gem/json_generator_test.rb
index be20b17c..a5fba570 100755
--- a/test/json_gem/json_generator_test.rb
+++ b/test/json_gem/json_generator_test.rb
@@ -144,7 +144,8 @@ def test_pretty_state
     actual.delete(:escape_slash)
     actual.delete(:strict)
     actual.delete(:script_safe)
-    assert_equal({
+
+    expected = {
       :allow_nan             => false,
       :array_nl              => "\n",
       :ascii_only            => false,
@@ -155,7 +156,12 @@ def test_pretty_state
       :object_nl             => "\n",
       :space                 => " ",
       :space_before          => "",
-    }.sort_by { |n,| n.to_s }, actual.sort_by { |n,| n.to_s })
+    }
+    if REAL_JSON_GEM && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.5.0')
+      expected[:as_json] = false
+    end
+
+    assert_equal(expected.sort_by { |n,| n.to_s }, actual.sort_by { |n,| n.to_s })
   end
 
   def test_safe_state
@@ -166,7 +172,8 @@ def test_safe_state
     actual.delete(:escape_slash)
     actual.delete(:strict)
     actual.delete(:script_safe)
-    assert_equal({
+
+    expected = {
       :allow_nan             => false,
       :array_nl              => "",
       :ascii_only            => false,
@@ -177,7 +184,12 @@ def test_safe_state
       :object_nl             => "",
       :space                 => "",
       :space_before          => "",
-    }.sort_by { |n,| n.to_s }, actual.sort_by { |n,| n.to_s })
+    }
+    if REAL_JSON_GEM && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.5.0')
+      expected[:as_json] = false
+    end
+
+    assert_equal(expected.sort_by { |n,| n.to_s }, actual.sort_by { |n,| n.to_s })
   end
 
   def test_fast_state
@@ -188,7 +200,8 @@ def test_fast_state
     actual.delete(:escape_slash)
     actual.delete(:strict)
     actual.delete(:script_safe)
-    assert_equal({
+
+    expected = {
       :allow_nan             => false,
       :array_nl              => "",
       :ascii_only            => false,
@@ -199,7 +212,12 @@ def test_fast_state
       :object_nl             => "",
       :space                 => "",
       :space_before          => "",
-    }.sort_by { |n,| n.to_s }, actual.sort_by { |n,| n.to_s })
+    }
+    if REAL_JSON_GEM && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.5.0')
+      expected[:as_json] = false
+    end
+
+    assert_equal(expected.sort_by { |n,| n.to_s }, actual.sort_by { |n,| n.to_s })
   end
 
   def test_allow_nan