diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5a420466cc..88e3bf21c9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -42,9 +42,7 @@ jobs:
       run: bundle exec rake
       env:
         RUBYOPT: --enable-frozen_string_literal
-      continue-on-error: ${{ matrix.ruby == 'truffleruby-head' }}
     - if: ${{ matrix.ruby == 'head' && startsWith(matrix.os, 'ubuntu') }}
       run: bundle exec rake rdoc
     - if: ${{ matrix.ruby == 'head' && startsWith(matrix.os, 'ubuntu') }}
       run: bundle exec rake rubocop
-
diff --git a/Rakefile b/Rakefile
index f47890b40b..508938c938 100644
--- a/Rakefile
+++ b/Rakefile
@@ -65,7 +65,7 @@ parsed_files = PARSER_FILES.map do |parser_file|
       racc = Gem.bin_path 'racc', 'racc'
       rb_file = parser_file.gsub(/\.ry\z/, ".rb")
       ruby "#{racc} -l -E -o #{rb_file} #{parser_file}"
-      open(rb_file, 'r+') do |f|
+      File.open(rb_file, 'r+') do |f|
         newtext = "# frozen_string_literal: true\n#{f.read}"
         f.rewind
         f.write newtext
diff --git a/test/rdoc/test_rdoc_rdoc.rb b/test/rdoc/test_rdoc_rdoc.rb
index 853d7dad22..5168932430 100644
--- a/test/rdoc/test_rdoc_rdoc.rb
+++ b/test/rdoc/test_rdoc_rdoc.rb
@@ -165,12 +165,7 @@ def test_normalized_file_list_with_dot_doc
       b = Dir.glob(b).first
       c = Dir.glob(c).first
 
-      dot_doc = File.expand_path('.document')
-      FileUtils.touch dot_doc
-      open(dot_doc, 'w') do |f|
-        f.puts 'a.rb'
-        f.puts 'b.rb'
-      end
+      File.write('.document', "a.rb\n""b.rb\n")
       expected_files << a
       expected_files << b
 
@@ -196,12 +191,7 @@ def test_normalized_file_list_with_dot_doc_overridden_by_exclude_option
       b = Dir.glob(b).first
       c = Dir.glob(c).first
 
-      dot_doc = File.expand_path('.document')
-      FileUtils.touch dot_doc
-      open(dot_doc, 'w') do |f|
-        f.puts 'a.rb'
-        f.puts 'b.rb'
-      end
+      File.write('.document', "a.rb\n""b.rb\n")
       expected_files << a
 
       @rdoc.options.exclude = Regexp.new(['b.rb'].join('|'))