diff --git a/requirements-test.txt b/requirements-test.txt
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,3 +1,6 @@
 pytest
 pytest-mock
 requests_mock
+types-click
+types-pyyaml
+types-requests
diff --git a/swh/__init__.py b/swh/__init__.py
--- 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__)
diff --git a/swh/lister/bitbucket/lister.py b/swh/lister/bitbucket/lister.py
--- a/swh/lister/bitbucket/lister.py
+++ b/swh/lister/bitbucket/lister.py
@@ -67,7 +67,7 @@
 
         self.incremental = incremental
 
-        self.url_params = {
+        self.url_params: Dict[str, Any] = {
             "pagelen": page_size,
             # only return needed JSON fields in bitbucket API responses
             # (also prevent errors 500 when listing)