diff --git a/tests/json_generator_test.rb b/tests/json_generator_test.rb
index 20f652dc..64042a4e 100755
--- a/tests/json_generator_test.rb
+++ b/tests/json_generator_test.rb
@@ -396,8 +396,8 @@ def test_string_ext_included_calls_super
       included = false
 
       Module.send(:alias_method, :included_orig, :included)
-      Module.remove_method(:included)
-      Module.define_method(:included) do |base|
+      Module.send(:remove_method, :included)
+      Module.send(:define_method, :included) do |base|
         included_orig(base)
         included = true
       end
@@ -409,9 +409,9 @@ def test_string_ext_included_calls_super
       assert included
     ensure
       if Module.private_method_defined?(:included_orig)
-        Module.remove_method(:included) if Module.method_defined?(:included)
+        Module.send(:remove_method, :included) if Module.method_defined?(:included)
         Module.send(:alias_method, :included, :included_orig)
-        Module.remove_method(:included_orig)
+        Module.send(:remove_method, :included_orig)
       end
     end
   end
diff --git a/tests/json_parser_test.rb b/tests/json_parser_test.rb
index 220826a4..cc9a74a9 100644
--- a/tests/json_parser_test.rb
+++ b/tests/json_parser_test.rb
@@ -24,6 +24,9 @@ def test_argument_encoding
   end if defined?(Encoding::UTF_16)
 
   def test_error_message_encoding
+    # https://github.com/flori/json/actions/runs/6478148162/job/17589572890
+    pend if RUBY_ENGINE == 'truffleruby'
+
     bug10705 = '[ruby-core:67386] [Bug #10705]'
     json = ".\"\xE2\x88\x9A\"".force_encoding(Encoding::UTF_8)
     e = assert_raise(JSON::ParserError) {