diff --git a/requirements-swh.txt b/requirements-swh.txt
--- 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
--- a/swh/loader/pytest_plugin.py
+++ b/swh/loader/pytest_plugin.py
@@ -22,7 +22,7 @@
                 {
                     "cls": "local",
                     "db": swh_storage_postgresql.dsn,
-                    "objstorage": {"cls": "memory", "args": {}},
+                    "objstorage": {"cls": "memory"},
                 },
             ],
         },