diff --git a/requirements-swh.txt b/requirements-swh.txt
index c150267..f4c172b 100644
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,4 +1,5 @@
 swh.core >= 0.3
 swh.model >= 0.5.0
+swh.objstorage >= 0.2.2
 swh.scheduler >= 0.4.0
 swh.storage >= 0.13.1
diff --git a/swh/loader/pytest_plugin.py b/swh/loader/pytest_plugin.py
index 3ef314f..5626038 100644
--- a/swh/loader/pytest_plugin.py
+++ b/swh/loader/pytest_plugin.py
@@ -1,48 +1,48 @@
 # Copyright (C) 2019-2020  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import os
 from typing import Any, Dict
 
 import pytest
 import yaml
 
 
 @pytest.fixture
 def swh_loader_config(swh_storage_postgresql) -> Dict[str, Any]:
     return {
         "storage": {
             "cls": "pipeline",
             "steps": [
                 {"cls": "retry"},
                 {"cls": "filter"},
                 {"cls": "buffer"},
                 {
                     "cls": "local",
                     "db": swh_storage_postgresql.dsn,
-                    "objstorage": {"cls": "memory", "args": {}},
+                    "objstorage": {"cls": "memory"},
                 },
             ],
         },
     }
 
 
 @pytest.fixture
 def swh_config(swh_loader_config, monkeypatch, tmp_path):
     conffile = os.path.join(str(tmp_path), "loader.yml")
     with open(conffile, "w") as f:
         f.write(yaml.dump(swh_loader_config))
     monkeypatch.setenv("SWH_CONFIG_FILENAME", conffile)
     return conffile
 
 
 @pytest.fixture(autouse=True, scope="session")
 def swh_proxy():
     """Automatically inject this fixture in all tests to ensure no outside
        connection takes place.
 
     """
     os.environ["http_proxy"] = "http://localhost:999"
     os.environ["https_proxy"] = "http://localhost:999"