diff --git a/test/penai/test_server_interaction.py b/test/penai/test_server_interaction.py
index 35f4705..325defc 100644
--- a/test/penai/test_server_interaction.py
+++ b/test/penai/test_server_interaction.py
@@ -1,6 +1,6 @@
 from penai.client import PenpotClient
 
 
-def test_authentication_successful():
+def test_authentication_successful() -> None:
     client = PenpotClient.create_default()
     assert client.session.cookies, "Authentication to penpot server failed, check your config!"