diff --git a/pyproject.toml b/pyproject.toml
index 1f9440f9..ebfb8377 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -148,6 +148,7 @@ filterwarnings = [
     "ignore:.*The default for the setting.*:FutureWarning",
     "ignore:.*:PendingDeprecationWarning",
 ]
+addopts = "--import-mode=importlib"
 
 [tool.coverage.run]
 omit = ["*/_docs.py"]
diff --git a/tests/test_renderers/test_fixtures_docutils.py b/tests/test_renderers/test_fixtures_docutils.py
index c46e51c7..37954792 100644
--- a/tests/test_renderers/test_fixtures_docutils.py
+++ b/tests/test_renderers/test_fixtures_docutils.py
@@ -11,12 +11,12 @@
 from typing import Any
 
 import pytest
-from conftest import normalize_doctree_xml
 from docutils import __version_info__ as docutils_version
 from docutils.core import Publisher, publish_doctree
 from pytest_param_files import ParamTestData
 
 from myst_parser.parsers.docutils_ import Parser
+from tests.conftest import normalize_doctree_xml
 
 FIXTURE_PATH = Path(__file__).parent.joinpath("fixtures")
 
diff --git a/tests/test_renderers/test_include_directive.py b/tests/test_renderers/test_include_directive.py
index e7065747..430b967b 100644
--- a/tests/test_renderers/test_include_directive.py
+++ b/tests/test_renderers/test_include_directive.py
@@ -3,10 +3,10 @@
 from pathlib import Path
 
 import pytest
-from conftest import normalize_doctree_xml
 from docutils.core import publish_doctree
 
 from myst_parser.parsers.docutils_ import Parser
+from tests.conftest import normalize_doctree_xml
 
 FIXTURE_PATH = Path(__file__).parent.joinpath("fixtures")
 
diff --git a/tests/test_renderers/test_myst_config.py b/tests/test_renderers/test_myst_config.py
index 9a276cce..7833c1e1 100644
--- a/tests/test_renderers/test_myst_config.py
+++ b/tests/test_renderers/test_myst_config.py
@@ -5,12 +5,12 @@
 from pathlib import Path
 
 import pytest
-from conftest import normalize_doctree_xml
 from docutils import __version_info__ as docutils_version
 from docutils.core import Publisher, publish_string
 from pytest_param_files import ParamTestData
 
 from myst_parser.parsers.docutils_ import Parser
+from tests.conftest import normalize_doctree_xml
 
 FIXTURE_PATH = Path(__file__).parent.joinpath("fixtures")
 INV_PATH = Path(__file__).parent.parent.absolute() / "static" / "objects_v2.inv"
diff --git a/tests/test_renderers/test_myst_refs.py b/tests/test_renderers/test_myst_refs.py
index fcdfd619..af8757be 100644
--- a/tests/test_renderers/test_myst_refs.py
+++ b/tests/test_renderers/test_myst_refs.py
@@ -1,10 +1,11 @@
 import sys
 
 import pytest
-from conftest import normalize_doctree_xml
 from sphinx.util.console import strip_colors
 from sphinx_pytest.plugin import CreateDoctree
 
+from tests.conftest import normalize_doctree_xml
+
 
 @pytest.mark.parametrize(
     "test_name,text,should_warn",