diff --git a/requirements-test.txt b/requirements-test.txt
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -3,4 +3,4 @@
 requests_mock
 swh-core[testing]
 swh-scheduler[testing] >= 0.5.0
-swh-storage[testing]
+swh-storage[testing] >= 0.10.6
diff --git a/swh/loader/tests/test_init.py b/swh/loader/tests/test_init.py
--- a/swh/loader/tests/test_init.py
+++ b/swh/loader/tests/test_init.py
@@ -337,11 +337,11 @@
         else:
             assert target.target in [REVISION.id, RELEASE.id]
 
-    swh_storage.content_add([CONTENT.to_dict()])
-    swh_storage.directory_add([DIRECTORY.to_dict()])
-    swh_storage.revision_add([REVISION.to_dict()])
-    swh_storage.release_add([RELEASE.to_dict()])
-    s = swh_storage.snapshot_add([SNAPSHOT.to_dict()])
+    swh_storage.content_add([CONTENT])
+    swh_storage.directory_add([DIRECTORY])
+    swh_storage.revision_add([REVISION])
+    swh_storage.release_add([RELEASE])
+    s = swh_storage.snapshot_add([SNAPSHOT])
     assert s == {
         "snapshot:add": 1,
     }
@@ -444,7 +444,7 @@
     # 5. snapshot is found in storage, targeted revision exists but the directory the
     # revision targets does not exist
 
-    swh_storage.revision_add([REVISION.to_dict()])
+    swh_storage.revision_add([REVISION])
 
     dir_not_found = list(swh_storage.directory_missing([REVISION.directory]))
     assert len(dir_not_found) == 1
@@ -459,7 +459,7 @@
         },
     )
 
-    swh_storage.snapshot_add([snapshot2.to_dict()])
+    swh_storage.snapshot_add([snapshot2])
     with pytest.raises(InexistentObjectsError, match="Missing directories"):
         check_snapshot(snapshot2, swh_storage)
 
@@ -473,7 +473,7 @@
     not_found = list(swh_storage.content_missing_per_sha1_git([CONTENT.sha1_git]))
     assert len(not_found) == 1
 
-    swh_storage.directory_add([DIRECTORY.to_dict()])
+    swh_storage.directory_add([DIRECTORY])
 
     snapshot3 = Snapshot(
         id=hash_to_bytes("091456f535f882bc7f9a18fb16c9ad27fda7bab7"),
@@ -485,7 +485,7 @@
         },
     )
 
-    swh_storage.snapshot_add([snapshot3.to_dict()])
+    swh_storage.snapshot_add([snapshot3])
     with pytest.raises(InexistentObjectsError, match="Missing content(s)"):
         check_snapshot(snapshot3, swh_storage)