diff --git a/tests/test_cli.py b/tests/test_cli.py
index 82d4879..3412eaf 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -54,17 +54,18 @@ def test_cli_validate_error():
 
 def test_cli_update():
     from tempfile import TemporaryDirectory
+    from pathlib import Path
     from dfschema.cli import app
     from dfschema.core.config import CURRENT_PROTOCOL_VERSION
 
     with TemporaryDirectory() as tmpdirname:
-        output_path = f"{tmpdirname}/active_sales_v2.json"
+        output_path = Path(tmpdirname) / "active_sales_v2.json"
         result = runner.invoke(
             app,
             [
                 "update",
                 "tests/test_schemas/v1/good/active_sales.json",
-                output_path,
+                str(output_path),
             ],
         )