diff --git a/src/pytest_mypy/__init__.py b/src/pytest_mypy/__init__.py
index 11e6ebd..4bcb5c9 100644
--- a/src/pytest_mypy/__init__.py
+++ b/src/pytest_mypy/__init__.py
@@ -118,26 +118,18 @@ def pytest_addoption(parser: pytest.Parser) -> None:
 
 def _xdist_worker(config: pytest.Config) -> Dict[str, Any]:
     try:
-        return {"input": _xdist_workerinput(config)}
+        # xdist.remote defines the workerinput attribute in worker processes.
+        return {"input": config.workerinput}  # type: ignore[attr-defined]
     except AttributeError:
         return {}
 
 
-def _xdist_workerinput(node: Union[WorkerController, pytest.Config]) -> Any:
-    try:
-        # mypy complains that pytest.Config does not have this attribute,
-        # but xdist.remote defines it in worker processes.
-        return node.workerinput  # type: ignore[union-attr]
-    except AttributeError:  # compat xdist < 2.0
-        return node.slaveinput  # type: ignore[union-attr]
-
-
 class MypyXdistControllerPlugin:
     """A plugin that is only registered on xdist controller processes."""
 
     def pytest_configure_node(self, node: WorkerController) -> None:
         """Pass the config stash to workers."""
-        _xdist_workerinput(node)["mypy_config_stash_serialized"] = node.config.stash[
+        node.workerinput["mypy_config_stash_serialized"] = node.config.stash[
             stash_key["config"]
         ].serialized()
 
diff --git a/tox.ini b/tox.ini
index efdc083..f04103d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,25 +3,25 @@
 minversion = 4.4
 isolated_build = true
 envlist =
-    py38-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    py39-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    py310-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    py311-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    py312-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    py313-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    py314-pytest{9.0, 9.x}-mypy{2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
+    py38-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    py39-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    py310-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    py311-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    py312-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    py313-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    py314-pytest{9.0, 9.x}-mypy{2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
     static
     publish
 
 [gh-actions]
 python =
-    3.8: py38-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    3.9: py39-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    3.10: py310-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    3.11: py311-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    3.12: py312-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}, static, publish
-    3.13: py313-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
-    3.14: py314-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{1.x, 2.0, 2.x, 3.0, 3.x}
+    3.8: py38-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    3.9: py39-pytest{7.0, 7.x, 8.0, 8.x}-mypy{1.0, 1.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    3.10: py310-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    3.11: py311-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    3.12: py312-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}, static, publish
+    3.13: py313-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
+    3.14: py314-pytest{7.0, 7.x, 8.0, 8.x, 9.0, 9.x}-mypy{1.0, 1.x, 2.0, 2.x}-xdist{2.0, 2.x, 3.0, 3.x}
 
 [testenv]
 constrain_package_deps = true
@@ -36,7 +36,6 @@ deps =
     mypy1.x: mypy ~= 1.0
     mypy2.0: mypy ~= 2.0.0
     mypy2.x: mypy ~= 2.0
-    xdist1.x: pytest-xdist ~= 1.0
     xdist2.0: pytest-xdist ~= 2.0.0
     xdist2.x: pytest-xdist ~= 2.0
     xdist3.0: pytest-xdist ~= 3.0.0