diff --git a/requirements-test.txt b/requirements-test.txt
index c6a0316d..67e0830d 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,9 +1,13 @@
 hypothesis >= 3.11.0
 pytest
 pytest-mock
 # pytz is in fact a dep of swh.model[testing] and should not be necessary, but
 # the dep on swh.model in the main requirements-swh.txt file shadows this one
 # adding the [testing] extra.
 swh.model[testing] >= 0.0.50
 pytz
 pytest-xdist
+types-python-dateutil
+types-pytz
+types-pyyaml
+types-requests
diff --git a/swh/__init__.py b/swh/__init__.py
index f14e1965..8d9f1510 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__)