diff --git a/requirements-swh.txt b/requirements-swh.txt
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,4 +1,4 @@
-swh.storage >= 0.0.178
-swh.model >= 0.0.60
+swh.storage >= 0.1
+swh.model >= 0.3
 swh.scheduler >= 0.0.39
-swh.loader.core >= 0.1.0
+swh.loader.core >= 0.2
diff --git a/swh/loader/svn/converters.py b/swh/loader/svn/converters.py
--- a/swh/loader/svn/converters.py
+++ b/swh/loader/svn/converters.py
@@ -3,7 +3,7 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, Optional, Sequence
 
 from swh.model.model import Person, Revision, RevisionType, TimestampWithTimezone
 
@@ -41,7 +41,7 @@
 
 
 def build_swh_revision(
-    rev: int, commit: Dict, repo_uuid: str, dir_id: bytes, parents: List[bytes]
+    rev: int, commit: Dict, repo_uuid: str, dir_id: bytes, parents: Sequence[bytes]
 ) -> Revision:
     """Given a svn revision, build a swh revision.
 
@@ -80,5 +80,5 @@
         committer=author,
         synthetic=True,
         metadata=metadata,
-        parents=parents,
+        parents=tuple(parents),
     )
diff --git a/swh/loader/svn/tests/test_converters.py b/swh/loader/svn/tests/test_converters.py
--- a/swh/loader/svn/tests/test_converters.py
+++ b/swh/loader/svn/tests/test_converters.py
@@ -62,7 +62,7 @@
             "author_date": date,
         },
         rev=10,
-        parents=[],
+        parents=(),
     )
 
     expected_rev = Revision.from_dict(
@@ -86,7 +86,7 @@
             "metadata": {
                 "extra_headers": [["svn_repo_uuid", b"uuid"], ["svn_revision", b"10"],]
             },
-            "parents": [],
+            "parents": (),
         }
     )
 
diff --git a/swh/loader/svn/tests/test_loader.py b/swh/loader/svn/tests/test_loader.py
--- a/swh/loader/svn/tests/test_loader.py
+++ b/swh/loader/svn/tests/test_loader.py
@@ -216,7 +216,9 @@
     "snapshot": Snapshot.from_dict({"id": GOURMET_FLAG_SNAPSHOT, "branches": {}}),
     "revision": {
         "id": hashutil.hash_to_bytes("4876cb10aec6f708f7466dddf547567b65f6c39c"),
-        "parents": [hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41")],
+        "parents": (
+            hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41"),
+        ),
         "directory": hashutil.hash_to_bytes("0deab3023ac59398ae467fc4bff5583008af1ee2"),
         "target_type": "revision",
         "metadata": {
@@ -422,9 +424,9 @@
                 "id": hashutil.hash_to_bytes(
                     "4876cb10aec6f708f7466dddf547567b65f6c39c"
                 ),
-                "parents": [
-                    hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41")
-                ],
+                "parents": (
+                    hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41"),
+                ),
                 "directory": hashutil.hash_to_bytes(
                     "0deab3023ac59398ae467fc4bff5583008af1ee2"
                 ),
@@ -490,9 +492,9 @@
     def setUp(self):
         previous_unfinished_revision = {
             "id": hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41"),
-            "parents": [
-                hashutil.hash_to_bytes("3f51abf3b3d466571be0855dfa67e094f9ceff1b")
-            ],
+            "parents": (
+                hashutil.hash_to_bytes("3f51abf3b3d466571be0855dfa67e094f9ceff1b"),
+            ),
             "directory": hashutil.hash_to_bytes(
                 "7dc52cc04c3b8bd7c085900d60c159f7b846f866"
             ),
@@ -562,9 +564,9 @@
                 "id": hashutil.hash_to_bytes(
                     "a3a577948fdbda9d1061913b77a1588695eadb41"
                 ),
-                "parents": [
-                    hashutil.hash_to_bytes("3f51abf3b3d466571be0855dfa67e094f9ceff1b")
-                ],
+                "parents": (
+                    hashutil.hash_to_bytes("3f51abf3b3d466571be0855dfa67e094f9ceff1b"),
+                ),
                 "directory": hashutil.hash_to_bytes(
                     "7dc52cc04c3b8bd7c085900d60c159f7b846f866"
                 ),
@@ -579,9 +581,9 @@
         }
         previous_unfinished_revision = {
             "id": hashutil.hash_to_bytes("4876cb10aec6f708f7466dddf547567b65f6c39c"),
-            "parents": [
-                hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41")
-            ],
+            "parents": (
+                hashutil.hash_to_bytes("a3a577948fdbda9d1061913b77a1588695eadb41"),
+            ),
             "directory": hashutil.hash_to_bytes(
                 "0deab3023ac59398ae467fc4bff5583008af1ee2"
             ),