diff --git a/swift_browser_ui/upload/download.py b/swift_browser_ui/upload/download.py
index 5f970ac2a..37fb96469 100644
--- a/swift_browser_ui/upload/download.py
+++ b/swift_browser_ui/upload/download.py
@@ -231,7 +231,7 @@ def __init__(self) -> None:
             maxsize=int(os.environ.get("SWIFT_UPLOAD_RUNNER_PROXY_Q_SIZE", 1024))
         )
 
-    def write(self, payload: bytes = None) -> None:
+    def write(self, payload: bytes) -> None:
         """Emulate BytesIO write function to be used with tarfile."""
         self.q.put(payload)
 
diff --git a/tests/sharing/test_db.py b/tests/sharing/test_db.py
index e54207868..ba0deae5c 100644
--- a/tests/sharing/test_db.py
+++ b/tests/sharing/test_db.py
@@ -129,7 +129,7 @@ class AsyncpgConnectionMock:
                     "r_read": True,
                     "r_write": True,
                     "container": "test-container",
-                    "sharingdate": "15 July 2020",
+                    "sharingdate": mock_date,
                     "container_owner": "test-owner",
                     "recipient": "test-recipient",
                     "address": "test-address",
@@ -170,7 +170,7 @@ async def __aexit__(self, *args, **kwargs):
                         "r_read": True,
                         "r_write": True,
                         "container": "test-container",
-                        "sharingdate": "15 July 2020",
+                        "sharingdate": mock_date,
                         "container_owner": "test-owner",
                         "recipient": "test-recipient",
                         "address": "test-address",
diff --git a/tox.ini b/tox.ini
index c84b744b3..d5d1fd238 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ deps =
 # Mypy fails if 3rd party library doesn't have type hints configured.
 # Alternative to ignoring imports would be to write custom stub files, which
 # could be done at some point.
-commands = mypy --ignore-missing-imports swift_browser_ui/
+commands = mypy --ignore-missing-imports --no-namespace-packages swift_browser_ui/
 
 [testenv:docs]
 ; skip_install = true