diff --git a/requirements-test.txt b/requirements-test.txt
index 984743d..2a54238 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,3 +1,5 @@
-Click
+click
 pytest
 pytz
+types-python-dateutil
+types-pytz
diff --git a/swh/__init__.py b/swh/__init__.py
index f14e196..8d9f151 100644
--- a/swh/__init__.py
+++ b/swh/__init__.py
@@ -1,4 +1,4 @@
 from pkgutil import extend_path
-from typing import Iterable
+from typing import List
 
-__path__ = extend_path(__path__, __name__)  # type: Iterable[str]
+__path__: List[str] = extend_path(__path__, __name__)