diff --git a/requirements-swh.txt b/requirements-swh.txt
index cea1983..6f36028 100644
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,5 +1,5 @@
-swh.core >= 0.0.44
+swh.core >= 0.0.56
 swh.model >= 0.0.27
 swh.objstorage >= 0.0.17
 swh.scheduler >= 0.0.39
 swh.storage >= 0.0.106
diff --git a/swh/vault/api/client.py b/swh/vault/api/client.py
index fcdfb9d..7c9f769 100644
--- a/swh/vault/api/client.py
+++ b/swh/vault/api/client.py
@@ -1,69 +1,58 @@
 # Copyright (C) 2016-2018  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
 
 from swh.model import hashutil
 from swh.core.api import SWHRemoteAPI
 
 
-class VaultAPIError(Exception):
-    """Vault API Error"""
-    def __str__(self):
-        return ('An unexpected error occurred in the Vault backend: {}'
-                .format(self.args))
-
-
 class RemoteVaultClient(SWHRemoteAPI):
     """Client to the Software Heritage vault cache."""
 
-    def __init__(self, url, timeout=None):
-        super().__init__(
-            api_exception=VaultAPIError, url=url, timeout=timeout)
-
     # Web API endpoints
 
     def fetch(self, obj_type, obj_id):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.get('fetch/{}/{}'.format(obj_type, hex_id))
 
     def cook(self, obj_type, obj_id, email=None):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.post('cook/{}/{}'.format(obj_type, hex_id),
                          data={},
                          params=({'email': email} if email else None))
 
     def progress(self, obj_type, obj_id):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.get('progress/{}/{}'.format(obj_type, hex_id))
 
     # Cookers endpoints
 
     def set_progress(self, obj_type, obj_id, progress):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.post('set_progress/{}/{}'.format(obj_type, hex_id),
                          data=progress)
 
     def set_status(self, obj_type, obj_id, status):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.post('set_status/{}/{}' .format(obj_type, hex_id),
                          data=status)
 
     # TODO: handle streaming properly
     def put_bundle(self, obj_type, obj_id, bundle):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.post('put_bundle/{}/{}' .format(obj_type, hex_id),
                          data=bundle)
 
     def send_notif(self, obj_type, obj_id):
         hex_id = hashutil.hash_to_hex(obj_id)
         return self.post('send_notif/{}/{}' .format(obj_type, hex_id),
                          data=None)
 
     # Batch endpoints
 
     def batch_cook(self, batch):
         return self.post('batch_cook', data=batch)
 
     def batch_progress(self, batch_id):
         return self.get('batch_progress/{}'.format(batch_id))