diff --git a/pkgs/development/python-modules/swh-objstorage/default.nix b/pkgs/development/python-modules/swh-objstorage/default.nix
index c7d7c6c6012a..22e053a0f9bb 100644
--- a/pkgs/development/python-modules/swh-objstorage/default.nix
+++ b/pkgs/development/python-modules/swh-objstorage/default.nix
@@ -3,8 +3,14 @@
   stdenv,
   buildPythonPackage,
   fetchFromGitLab,
+  pythonAtLeast,
+  util-linux,
+
+  # build-system
   setuptools,
   setuptools-scm,
+
+  # dependencies
   backports-entry-points-selectable,
   cassandra-driver,
   click,
@@ -15,10 +21,12 @@
   mypy-extensions,
   psycopg,
   redis,
-  tenacity,
   swh-core,
   swh-model,
   swh-shard,
+  tenacity,
+
+  # tests
   aiohttp,
   azure-core,
   azure-storage-blob,
@@ -26,16 +34,15 @@
   libcloud,
   postgresql,
   postgresqlTestHook,
-  pytestCheckHook,
   pytest-mock,
   pytest-postgresql,
+  pytestCheckHook,
   requests-mock,
   requests-toolbelt,
   systemd-python,
   types-python-dateutil,
   types-pyyaml,
   types-requests,
-  util-linux,
 }:
 
 buildPythonPackage (finalAttrs: {
@@ -52,6 +59,13 @@ buildPythonPackage (finalAttrs: {
     hash = "sha256-NnNT9Lt/LGDIJpUmfkfPn6JnF3k8Usf2UVa88zHPKlg=";
   };
 
+  postPatch = ''
+    substituteInPlace swh/objstorage/backends/winery/roshard.py \
+      --replace-fail \
+        "/usr/bin/fallocate" \
+        "${lib.getExe' util-linux "fallocate"}"
+  '';
+
   build-system = [
     setuptools
     setuptools-scm
@@ -68,17 +82,12 @@ buildPythonPackage (finalAttrs: {
     mypy-extensions
     psycopg
     redis
-    tenacity
     swh-core
     swh-model
     swh-shard
+    tenacity
   ];
 
-  preCheck = ''
-    substituteInPlace swh/objstorage/backends/winery/roshard.py \
-      --replace-fail "/usr/bin/fallocate" "fallocate"
-  '';
-
   pythonImportsCheck = [ "swh.objstorage" ];
 
   # Many broken tests on Darwin. Disabling them for now.
@@ -94,9 +103,9 @@ buildPythonPackage (finalAttrs: {
     libcloud
     postgresql
     postgresqlTestHook
-    pytestCheckHook
     pytest-mock
     pytest-postgresql
+    pytestCheckHook
     requests-mock
     requests-toolbelt
     systemd-python
@@ -107,11 +116,20 @@ buildPythonPackage (finalAttrs: {
   ]
   ++ psycopg.optional-dependencies.pool;
 
-  disabledTests = lib.optionals (stdenv.hostPlatform.isAarch64 && stdenv.hostPlatform.isLinux) [
-    # FAILED swh/objstorage/tests/test_objstorage_winery.py::test_winery_leaky_bucket_tick - assert 1 == 0
-    "test_winery_leaky_bucket_tick"
+  disabledTestPaths = lib.optionals (pythonAtLeast "3.14") [
+    # _pickle.PicklingError: Can't pickle local object
+    "swh/objstorage/tests/test_objstorage_api.py"
   ];
 
+  disabledTests =
+    lib.optionals (pythonAtLeast "3.14") [
+      "test_winery_add_and_pack"
+    ]
+    ++ lib.optionals (stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isAarch64) [
+      # FAILED swh/objstorage/tests/test_objstorage_winery.py::test_winery_leaky_bucket_tick - assert 1 == 0
+      "test_winery_leaky_bucket_tick"
+    ];
+
   meta = {
     changelog = "https://gitlab.softwareheritage.org/swh/devel/swh-objstorage/-/tags/${finalAttrs.src.tag}";
     description = "Content-addressable object storage for the Software Heritage project";