diff --git a/lib/stackprof.rb b/lib/stackprof.rb
index 0d39dca..fbea42b 100644
--- a/lib/stackprof.rb
+++ b/lib/stackprof.rb
@@ -5,7 +5,11 @@
 end
 
 if defined?(RubyVM::YJIT) && RubyVM::YJIT.enabled?
-  StackProf.use_postponed_job!
+  if RUBY_VERSION < "3.3"
+    # On 3.3 we don't need postponed jobs:
+    # https://github.com/ruby/ruby/commit/a1dc1a3de9683daf5a543d6f618e17aabfcb8708
+    StackProf.use_postponed_job!
+  end
 elsif RUBY_VERSION == "3.2.0"
   # 3.2.0 crash is the signal is received at the wrong time.
   # Fixed in https://github.com/ruby/ruby/pull/7116
diff --git a/test/test_middleware.rb b/test/test_middleware.rb
index b92e1ce..191c938 100644
--- a/test/test_middleware.rb
+++ b/test/test_middleware.rb
@@ -4,7 +4,7 @@
 require 'minitest/autorun'
 require 'tmpdir'
 
-class StackProf::MiddlewareTest < MiniTest::Test
+class StackProf::MiddlewareTest < Minitest::Test
 
   def test_path_default
     StackProf::Middleware.new(Object.new)
diff --git a/test/test_report.rb b/test/test_report.rb
index 3b0dd1b..2dffb39 100644
--- a/test/test_report.rb
+++ b/test/test_report.rb
@@ -2,7 +2,7 @@
 require 'stackprof'
 require 'minitest/autorun'
 
-class ReportDumpTest < MiniTest::Test
+class ReportDumpTest < Minitest::Test
   require 'stringio'
 
   def test_dump_to_stdout
@@ -33,7 +33,7 @@ def assert_dump(expected, marshal_data)
   end
 end
 
-class ReportReadTest < MiniTest::Test
+class ReportReadTest < Minitest::Test
   require 'pathname'
 
   def test_from_file_read_json
diff --git a/test/test_stackprof.rb b/test/test_stackprof.rb
index d0de330..b979e34 100644
--- a/test/test_stackprof.rb
+++ b/test/test_stackprof.rb
@@ -4,7 +4,7 @@
 require 'tempfile'
 require 'pathname'
 
-class StackProfTest < MiniTest::Test
+class StackProfTest < Minitest::Test
   def setup
     Object.new # warm some caches to avoid flakiness
   end
diff --git a/test/test_truffleruby.rb b/test/test_truffleruby.rb
index 6b6b8a5..37ae767 100644
--- a/test/test_truffleruby.rb
+++ b/test/test_truffleruby.rb
@@ -3,7 +3,7 @@
 require 'minitest/autorun'
 
 if RUBY_ENGINE == 'truffleruby'
-  class StackProfTruffleRubyTest < MiniTest::Test
+  class StackProfTruffleRubyTest < Minitest::Test
     def test_error
       error = assert_raises RuntimeError do
         StackProf.run(mode: :cpu) do