diff --git a/debian/control b/debian/control
--- a/debian/control
+++ b/debian/control
@@ -14,7 +14,7 @@
                python3-psycopg2,
                python3-setuptools,
                python3-swh.core (>= 0.0.44~),
-               python3-swh.model (>= 0.0.18~),
+               python3-swh.model (>= 0.0.27~),
                python3-swh.objstorage (>= 0.0.17~),
                python3-swh.scheduler (>= 0.0.26~),
                python3-swh.storage (>= 0.0.108~),
@@ -25,7 +25,7 @@
 Package: python3-swh.vault
 Architecture: all
 Depends: python3-swh.core (>= 0.0.44~),
-         python3-swh.model (>= 0.0.18~),
+         python3-swh.model (>= 0.0.27~),
          python3-swh.objstorage (>= 0.0.17~),
          python3-swh.scheduler (>= 0.0.26~),
          python3-swh.storage (>= 0.0.108~),
diff --git a/requirements-swh.txt b/requirements-swh.txt
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,5 +1,5 @@
 swh.core >= 0.0.44
-swh.model >= 0.0.18
+swh.model >= 0.0.27
 swh.objstorage >= 0.0.17
 swh.scheduler >= 0.0.26
 swh.storage >= 0.0.106
diff --git a/swh/vault/tests/vault_testing.py b/swh/vault/tests/vault_testing.py
--- a/swh/vault/tests/vault_testing.py
+++ b/swh/vault/tests/vault_testing.py
@@ -60,5 +60,15 @@
 
 
 def hash_content(content):
-    obj_id = hashutil.hash_data(content)['sha1']
-    return content, obj_id
+    """Hash the content's id (sha1).
+
+    Args:
+        content (bytes): Content to hash
+
+    Returns:
+        The tuple (content, content's id as bytes)
+
+    """
+    hashes = hashutil.MultiHash.from_data(
+        content, hash_names=['sha1']).digest()
+    return content, hashes['sha1']