diff --git a/tests/conftest.py b/tests/conftest.py
index 9a818da..ef0c8c1 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -171,7 +171,12 @@ def _factory(
 
         poetry = Factory().create_poetry(project_dir)
 
-        locker = TestLocker(poetry.locker.lock, poetry.locker._local_config)
+        try:
+            # before https://github.com/python-poetry/poetry/pull/9133
+            locker = TestLocker(poetry.locker.lock, poetry.locker._pyproject_data)
+        except AttributeError:
+            # after https://github.com/python-poetry/poetry/pull/9133
+            locker = TestLocker(poetry.locker.lock, poetry.locker._local_config)
         locker.write()
 
         poetry.set_locker(locker)