diff --git a/src/tqdm_publisher/_demos/_demo_command_line_interface.py b/src/tqdm_publisher/_demos/_demo_command_line_interface.py
index c00b08e..714cca6 100644
--- a/src/tqdm_publisher/_demos/_demo_command_line_interface.py
+++ b/src/tqdm_publisher/_demos/_demo_command_line_interface.py
@@ -18,6 +18,7 @@
 
 DEMO_BASE_FOLDER_PATH = Path(__file__).parent
 
+
 def _command_line_interface():
     """A simple command line interface for running the demo for TQDM Publisher."""
     if len(sys.argv) <= 1:
diff --git a/src/tqdm_publisher/_demos/_parallel_bars/_server.py b/src/tqdm_publisher/_demos/_parallel_bars/_server.py
index 01c0cb0..2f53763 100644
--- a/src/tqdm_publisher/_demos/_parallel_bars/_server.py
+++ b/src/tqdm_publisher/_demos/_parallel_bars/_server.py
@@ -220,6 +220,7 @@ def update():
 
     return jsonify({"status": "success"})
 
+
 @app.route("/events", methods=["GET"])
 @cross_origin()
 def events():