diff --git a/modflow_devtools/fixtures.py b/modflow_devtools/fixtures.py
index 0700cf8..4504f72 100644
--- a/modflow_devtools/fixtures.py
+++ b/modflow_devtools/fixtures.py
@@ -71,7 +71,7 @@ def module_tmpdir(tmpdir_factory, request) -> Path:
 
 @pytest.fixture(scope="session")
 def session_tmpdir(tmpdir_factory, request) -> Path:
-    temp = Path(tmpdir_factory.mktemp(request.session.name))
+    temp = Path(tmpdir_factory.mktemp(request.config.rootpath.name))
     yield temp
 
     keep = request.config.option.KEEP
diff --git a/pyproject.toml b/pyproject.toml
index 4d2a701..3ed78e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,6 @@ test = [
     "ninja",
     "numpy",
     "pytest",
-    "pytest-cases",
     "pytest-cov",
     "pytest-dotenv",
     "pytest-xdist",