diff --git a/tests/test_kim_edn/test_tool.py b/tests/test_kim_edn/test_tool.py
index 30c6d8d..4464789 100644
--- a/tests/test_kim_edn/test_tool.py
+++ b/tests/test_kim_edn/test_tool.py
@@ -6,13 +6,12 @@
 
 from test import support
 
-if sys.version_info.minor >= 10:
+if sys.version_info.minor >= 11:
     from test.support import os_helper
-
-if sys.version_info.minor >= 9:
     from test.support.script_helper import assert_python_ok
 
 
+@unittest.skipIf(sys.version_info.minor < 11, "not supported in this Python version")
 @support.requires_subprocess()
 class TestTool(unittest.TestCase):
     data = """
@@ -99,7 +98,6 @@ def test_stdin_stdout(self):
         self.assertEqual(process.stdout, self.expect)
         self.assertEqual(process.stderr, '')
 
-    @unittest.skipIf(sys.version_info.minor < 10, "not supported in this Python version")
     def _create_infile(self, data=None):
         infile = os_helper.TESTFN
         with open(infile, "w", encoding="utf-8") as fp:
@@ -107,7 +105,6 @@ def _create_infile(self, data=None):
             fp.write(data or self.data)
         return infile
 
-    @unittest.skipIf(sys.version_info.minor < 9, "not supported in this Python version")
     def test_infile_stdout(self):
         infile = self._create_infile()
         rc, out, err = assert_python_ok('-m', 'kim_edn.tool', infile)
@@ -115,7 +112,6 @@ def test_infile_stdout(self):
         self.assertEqual(out.splitlines(), self.expect.encode().splitlines())
         self.assertEqual(err, b'')
 
-    @unittest.skipIf(sys.version_info.minor < 9, "not supported in this Python version")
     def test_non_ascii_infile(self):
         data = '{"msg": "\u3053\u3093\u306b\u3061\u306f"}'
         expect = textwrap.dedent('''\
@@ -132,7 +128,6 @@ def test_non_ascii_infile(self):
         self.assertEqual(out.splitlines(), expect.splitlines())
         self.assertEqual(err, b'')
 
-    @unittest.skipIf(sys.version_info.minor < 10, "not supported in this Python version")
     def test_infile_outfile(self):
         infile = self._create_infile()
         outfile = os_helper.TESTFN + '.out'
@@ -144,7 +139,6 @@ def test_infile_outfile(self):
         self.assertEqual(out, b'')
         self.assertEqual(err, b'')
 
-    @unittest.skipIf(sys.version_info.minor < 9, "not supported in this Python version")
     def test_writing_in_place(self):
         infile = self._create_infile()
         rc, out, err = assert_python_ok('-m', 'kim_edn.tool', infile, infile)
@@ -160,14 +154,12 @@ def test_edn_lines(self):
         self.assertEqual(process.stdout, self.ednlines_expect)
         self.assertEqual(process.stderr, '')
 
-    @unittest.skipIf(sys.version_info.minor < 9, "not supported in this Python version")
     def test_help_flag(self):
         rc, out, err = assert_python_ok('-m', 'kim_edn.tool', '-h')
         self.assertEqual(rc, 0)
         self.assertTrue(out.startswith(b'usage: '))
         self.assertEqual(err, b'')
 
-    @unittest.skipIf(sys.version_info.minor < 9, "not supported in this Python version")
     def test_sort_keys_flag(self):
         infile = self._create_infile()
         rc, out, err = assert_python_ok('-m', 'kim_edn.tool', '--sort-keys', infile)