diff --git a/ersilia/cli/commands/close.py b/ersilia/cli/commands/close.py
index 625d1fefa..d053ceda4 100644
--- a/ersilia/cli/commands/close.py
+++ b/ersilia/cli/commands/close.py
@@ -20,7 +20,10 @@ def close():
         mdl.close()
         echo(":no_entry: Model {0} closed".format(mdl.model_id), fg="green")
 
-        #renames current_session to timestamp 
+        # renames current_session to timestamp
         old_file_path = "current_session.txt"
-        new_file_path = os.path.join(os.path.dirname(old_file_path), datetime.datetime.now().strftime('%Y%m%d%H%M%S'))
-        os.rename(old_file_path, new_file_path)
\ No newline at end of file
+        new_file_path = os.path.join(
+            os.path.dirname(old_file_path),
+            datetime.datetime.now().strftime("%Y%m%d%H%M%S"),
+        )
+        os.rename(old_file_path, new_file_path)
diff --git a/ersilia/cli/commands/serve.py b/ersilia/cli/commands/serve.py
index c8b4be6ce..d4018357a 100644
--- a/ersilia/cli/commands/serve.py
+++ b/ersilia/cli/commands/serve.py
@@ -22,7 +22,11 @@ def serve_cmd():
     )
     # Add the new flag for tracking the serve session
     @click.option(
-        "-t/", "--track_serve/--no_track_serve", "track_serve", required=False, default=True
+        "-t/",
+        "--track_serve/--no_track_serve",
+        "track_serve",
+        required=False,
+        default=True,
     )
     def serve(model, lake, docker, port, track_serve):
         if docker:
diff --git a/ersilia/core/tracking.py b/ersilia/core/tracking.py
index ec7c0c9be..e759e5400 100644
--- a/ersilia/core/tracking.py
+++ b/ersilia/core/tracking.py
@@ -95,12 +95,12 @@ def track(self, input, result, meta):
         self.stats(result)
 
         self.get_file_sizes(input_dataframe, result_dataframe)
-        
-        json_object = json.dumps(json_dict, indent = 4)  
+
+        json_object = json.dumps(json_dict, indent=4)
         print("\nJSON Dictionary:\n", json_object)
 
         # log results to console
-        with open('../cli/commands/current_session.txt', 'a') as f:
+        with open("../cli/commands/current_session.txt", "a") as f:
             # write the print statements to a file
             f.write(f"\n{json.dumps(input_dataframe)}\n")
             f.write(f"\n{json.dumps(result_dataframe)}\n")
@@ -109,7 +109,6 @@ def track(self, input, result, meta):
             f.write(f"\nTime taken: {time}\n")
             f.write(f"\nNAN Count:\n {nan_count}\n")
 
-
     def log_to_console(self, data):
         print(f"\n{json.dumps(data)}\n")