diff --git a/tuna/cli.py b/tuna/cli.py
index eaaa4d3..066c9d6 100644
--- a/tuna/cli.py
+++ b/tuna/cli.py
@@ -26,7 +26,7 @@ def main(argv=None):
         shutil.copytree(this_dir / "web" / "static", static_dir)
         if args.browser:
             threading.Thread(
-                target=lambda: webbrowser.open_new_tab(outdir / "index.html")
+                target=lambda: webbrowser.open_new_tab(str(outdir / "index.html"))
             ).start()
     else:
         start_server(args.infile, args.browser, args.port)
@@ -34,7 +34,7 @@ def main(argv=None):
 
 def _get_parser():
     """Parse input options."""
-    parser = argparse.ArgumentParser(description=("Visualize Python profile."))
+    parser = argparse.ArgumentParser(description="Visualize Python profile.")
 
     parser.add_argument("infile", type=str, help="input runtime or import profile file")
     parser.add_argument(
@@ -66,6 +66,6 @@ def _get_parser():
         "--version",
         "-v",
         action="version",
-        version="%(prog)s " + (f"(version {__version__})"),
+        version="%(prog)s " + f"(version {__version__})",
     )
     return parser