diff --git a/pasqal_cloud/__init__.py b/pasqal_cloud/__init__.py
index dffe91f..68a7508 100644
--- a/pasqal_cloud/__init__.py
+++ b/pasqal_cloud/__init__.py
@@ -63,7 +63,7 @@
 simplefilter("always", DeprecationWarning)
 
 
-def _check_sdk_version():
+def _check_sdk_version() -> None:
     # Compare current date to deprecation date to check whether
     # current version has fallen out of maintenance window.
     current_date = datetime.now()