diff --git a/requirements-swh.txt b/requirements-swh.txt
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,5 +1,5 @@
 swh.core >= 0.0.7
-swh.loader.core >= 0.0.78
+swh.loader.core >= 0.3.0
 swh.model >= 0.3.0
 swh.scheduler >= 0.0.39
-swh.storage >= 0.0.108
+swh.storage >= 0.3.0
diff --git a/swh/loader/git/tests/test_from_disk.py b/swh/loader/git/tests/test_from_disk.py
--- a/swh/loader/git/tests/test_from_disk.py
+++ b/swh/loader/git/tests/test_from_disk.py
@@ -3,6 +3,7 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+import datetime
 import os.path
 
 import dulwich.repo
@@ -131,7 +132,9 @@
         super().setUp("testrepo.tgz", uncompress_archive=True)
         self.loader = GitLoaderFromDiskTest(
             url=self.repo_url,
-            visit_date="2016-05-03 15:16:32+00",
+            visit_date=datetime.datetime(
+                2016, 5, 3, 15, 16, 32, tzinfo=datetime.timezone.utc
+            ),
             directory=self.destination_path,
         )
         self.storage = self.loader.storage
@@ -153,7 +156,9 @@
         super().setUp("testrepo.tgz", uncompress_archive=False)
         self.loader = GitLoaderFromArchive(
             url=self.repo_url,
-            visit_date="2016-05-03 15:16:32+00",
+            visit_date=datetime.datetime(
+                2016, 5, 3, 15, 16, 32, tzinfo=datetime.timezone.utc
+            ),
             archive_path=self.destination_path,
         )
         self.storage = self.loader.storage