diff --git a/debian/control b/debian/control
index 8c64902..be018b9 100644
--- a/debian/control
+++ b/debian/control
@@ -1,30 +1,30 @@
 Source: swh-loader-tar
 Maintainer: Software Heritage developers <swh-devel@inria.fr>
 Section: python
 Priority: optional
 Build-Depends: debhelper (>= 9),
                dh-python (>= 2),
                python3-all,
                python3-nose,
                python3-setuptools,
-               python3-swh.core (>= 0.0.36~),
+               python3-swh.core (>= 0.0.46~),
                python3-swh.loader.core (>= 0.0.35~),
                python3-swh.loader.dir (>= 0.0.33~),
                python3-swh.model (>= 0.0.27~),
                python3-swh.scheduler (>= 0.0.14~),
                python3-swh.storage (>= 0.0.83~),
                python3-vcversioner
 Standards-Version: 3.9.6
 Homepage: https://forge.softwareheritage.org/diffusion/DLDTAR/
 
 Package: python3-swh.loader.tar
 Architecture: all
-Depends: python3-swh.core (>= 0.0.36~),
+Depends: python3-swh.core (>= 0.0.46~),
          python3-swh.loader.core (>= 0.0.35~),
          python3-swh.loader.dir (>= 0.0.33~),
          python3-swh.model (>= 0.0.27~),
          python3-swh.scheduler (>= 0.0.14~),
          python3-swh.storage (>= 0.0.83~),
          ${misc:Depends},
          ${python3:Depends}
 Description: Software Heritage Tarball Loader
diff --git a/requirements-swh.txt b/requirements-swh.txt
index e1f2d27..7442ced 100644
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,6 +1,6 @@
-swh.core >= 0.0.36
+swh.core >= 0.0.46
 swh.model >= 0.0.27
 swh.scheduler >= 0.0.14
 swh.storage >= 0.0.83
 swh.loader.core >= 0.0.35
 swh.loader.dir >= 0.0.33
diff --git a/swh/loader/tar/utils.py b/swh/loader/tar/utils.py
index 73a17d6..232832d 100644
--- a/swh/loader/tar/utils.py
+++ b/swh/loader/tar/utils.py
@@ -1,56 +1,37 @@
 # Copyright (C) 2015-2018  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
 
 import random
-import itertools
 
-
-def grouper(iterable, n, fillvalue=None):
-    """Collect data into fixed-length chunks or blocks.
-
-    Args:
-        iterable (Iterable): an iterable
-        n (int): size of block to slice the iterable into
-        fillvalue (Optional[Something]): value to use as fill-in
-          values (typically for the last loop, the iterable might be
-          less than n elements). None by default but could be anything
-          relevant for the caller (e.g tuple of (None, None))
-
-    Returns:
-        fixed-length chunks of blocks as iterables
-
-    """
-    args = [iter(iterable)] * n
-    for _data in itertools.zip_longest(*args, fillvalue=fillvalue):
-        yield (d for d in _data if d is not fillvalue)
+from swh.core.utils import grouper
 
 
 def random_blocks(iterable, block=100, fillvalue=None):
     """Given an iterable:
 
     - slice the iterable in data set of block-sized elements
     - randomized the block-sized elements
     - yield each element of that randomized block-sized
     - continue onto the next block-sized block
 
     Args:
         iterable (Iterable): an iterable
         block (int): number of elements per block
         fillvalue (Optional[Something]): value to use as fill-in
           values (typically for the last loop, the iterable might be
           less than n elements). None by default but could be anything
           relevant for the caller (e.g tuple of (None, None))
 
     Yields:
         random elements per size of block
 
     """
     count = 0
     for iter_ in grouper(iterable, block, fillvalue=fillvalue):
         count += 1
         lst = list(iter_)
         random.shuffle(lst)
         for e in lst:
             yield e