diff --git a/tests/factories/base.py b/tests/factories/base.py
index 3b80f98..9bbe0f7 100644
--- a/tests/factories/base.py
+++ b/tests/factories/base.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 from typing import TYPE_CHECKING, Dict, List, Union
 
 from tests.conftest import fake
@@ -10,10 +11,11 @@
     from pydantic_core import TzInfo
 
 
-try:
-    import zoneinfo
-except ImportError:
+if sys.version_info < (3, 9):
     from backports import zoneinfo
+else:
+    import zoneinfo
+
 
 
 def datetime_repr_factory(timezone: Union[ZoneInfo, TzInfo, None] = None) -> str:
diff --git a/tests/factories/project.py b/tests/factories/project.py
index 75033b6..bb71589 100644
--- a/tests/factories/project.py
+++ b/tests/factories/project.py
@@ -1,29 +1,30 @@
 from __future__ import annotations
 
+import sys
 from typing import Dict, Optional, Union
 
 from tests.conftest import fake
 from tests.factories.base import datetime_repr_factory
 
 
-try:
-    import zoneinfo
-except ImportError:
+if sys.version_info < (3, 9):
     from backports import zoneinfo
+else:
+    import zoneinfo
 
 
-def project_request_factory() -> Dict[str, Union[str, bool, int, None]]:
-    start_date = fake.past_date()
+def project_request_factory() -> Dict[str, Union[str, bool, int]]:
+    start_date = fake.future_date()
 
     request_body = {
         "active": fake.boolean(),
         "auto_estimates": fake.boolean(),
         "currency": fake.currency_code(),
-        "end_date": fake.date_between(start_date=start_date).isoformat(),
+        "end_date": fake.date_between(start_date=start_date, end_date="+90d").isoformat(),
         "estimated_hours": fake.random_int(),
         "is_private": fake.boolean(),
         "is_shared": fake.boolean(),
-        "name": fake.uuid4(),
+        "name": str(fake.uuid4()),
         "start_date": start_date.isoformat(),
         "template": fake.boolean(),
     }
@@ -63,7 +64,6 @@ def project_response_factory(
         "is_private": fake.boolean(),
         "is_shared": fake.boolean(),
         "name": fake.word(),
-        "permissions": None,
         "rate": fake.random_int() if fake.boolean() else None,
         "rate_last_updated": datetime_repr_factory(timezone) if fake.boolean() else None,
         "recurring": fake.boolean(),
diff --git a/tests/factories/time_entry.py b/tests/factories/time_entry.py
index 815268f..b07e24b 100644
--- a/tests/factories/time_entry.py
+++ b/tests/factories/time_entry.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 from datetime import datetime, timedelta
 from typing import TYPE_CHECKING, Dict, List, Optional, Union
 
@@ -12,10 +13,10 @@
     from pydantic_core import TzInfo
 
 
-try:
-    import zoneinfo
-except ImportError:
+if sys.version_info < (3, 9):
     from backports import zoneinfo
+else:
+    import zoneinfo
 
 
 def _stop_datetime_repr_factory(
@@ -88,7 +89,6 @@ def time_entry_response_factory(
         "duration": duration or fake.random_int(),
         "duronly": fake.boolean(),
         "id": fake.random_number(digits=11, fix_len=True),
-        "permissions": None,
         "project_id": project_id or fake.random_int(),
         "server_deleted_at": (
             fake.date_time_this_month(tzinfo=tz).isoformat(timespec="seconds")
diff --git a/tests/factories/workspace.py b/tests/factories/workspace.py
index 15fbfaf..ea93c24 100644
--- a/tests/factories/workspace.py
+++ b/tests/factories/workspace.py
@@ -1,15 +1,16 @@
 from __future__ import annotations
 
+import sys
 from typing import Dict, List, Optional, Set, Union
 
 from tests.conftest import fake
 from tests.factories.base import datetime_repr_factory
 
 
-try:
-    import zoneinfo
-except ImportError:
+if sys.version_info < (3, 9):
     from backports import zoneinfo
+else:
+    import zoneinfo
 
 
 def workspace_request_factory(
@@ -55,7 +56,6 @@ def workspace_response_factory(
         "only_admins_see_billable_rates": fake.boolean(),
         "only_admins_see_team_dashboard": fake.boolean(),
         "organization_id": 8364520,
-        "permissions": None,
         "premium": fake.boolean(),
         "projects_billable_by_default": fake.boolean(),
         "projects_enforce_billable": fake.boolean(),
diff --git a/tests/integration/test_project.py b/tests/integration/test_project.py
index e33e611..d723dcf 100644
--- a/tests/integration/test_project.py
+++ b/tests/integration/test_project.py
@@ -27,7 +27,7 @@ def test_create_project__without_query_params(i_authed_workspace: Workspace) ->
     optional_fields = {"end_date", "status"}
     expected_result = set(ProjectResponse.model_fields.keys()) - optional_fields
 
-    result = i_authed_workspace.create_project(workspace_id, name=fake.uuid4())
+    result = i_authed_workspace.create_project(workspace_id, name=str(fake.uuid4()))
 
     assert result.model_fields_set == expected_result
 
@@ -52,7 +52,7 @@ def test_create_project__all_params(i_authed_workspace: Workspace) -> None:
 
 def test_get_projects__without_query_params(i_authed_workspace: Workspace) -> None:
     workspace_id = int(os.environ["WORKSPACE_ID"])
-    project = i_authed_workspace.create_project(workspace_id, name=fake.uuid4())
+    project = i_authed_workspace.create_project(workspace_id, name=str(fake.uuid4()))
     # Field `status` is set to `archived` after first fetch request, `end_date` is still absent
     optional_fields = {"end_date"}
     expected_result = set(ProjectResponse.model_fields.keys()) - optional_fields
@@ -411,18 +411,16 @@ def test_me_get_paginated_projects__per_page(
 
 def test_update_project(i_authed_workspace: Workspace) -> None:
     workspace_id = int(os.environ["WORKSPACE_ID"])
-    project = i_authed_workspace.create_project(workspace_id, name=fake.uuid4())
+    project = i_authed_workspace.create_project(workspace_id, name=str(fake.uuid4()))
     full_request_body = project_request_factory()
     random_param = fake.random_element(full_request_body.keys())
     request_body = {random_param: full_request_body[random_param]}
-    old_param_value = getattr(project, random_param)
     optional_fields = {"end_date"}
     expected_result = set(ProjectResponse.model_fields.keys()) - optional_fields
 
     result = i_authed_workspace.update_project(workspace_id, project.id, **request_body)
 
     assert result.model_fields_set == expected_result
-    assert getattr(result, random_param) != old_param_value
 
     _ = i_authed_workspace.delete_project(workspace_id, project.id)
 
diff --git a/tests/integration/test_report_time_entry.py b/tests/integration/test_report_time_entry.py
index a3f777c..84430c9 100644
--- a/tests/integration/test_report_time_entry.py
+++ b/tests/integration/test_report_time_entry.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+import sys
 from datetime import timedelta
 from typing import TYPE_CHECKING
 
@@ -20,10 +21,11 @@
     from toggl_python.entities.workspace import Workspace
 
 
-try:
-    import zoneinfo
-except ImportError:
+if sys.version_info < (3, 9):
     from backports import zoneinfo
+else:
+    import zoneinfo
+
 
 
 @pytest.mark.parametrize(
diff --git a/tests/integration/test_time_entry.py b/tests/integration/test_time_entry.py
index 31b7555..b0308a6 100644
--- a/tests/integration/test_time_entry.py
+++ b/tests/integration/test_time_entry.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+import sys
 from datetime import timedelta
 from typing import TYPE_CHECKING
 
@@ -16,10 +17,11 @@
 from tests.integration import pytestmark  # noqa: F401 - imported but unused
 
 
-try:
-    import zoneinfo
-except ImportError:
+if sys.version_info < (3, 9):
     from backports import zoneinfo
+else:
+    import zoneinfo
+
 
 
 if TYPE_CHECKING:
@@ -52,7 +54,7 @@ def test_create_time_entry__all_fields(i_authed_workspace: Workspace) -> None:
     workspace_id = int(os.environ["WORKSPACE_ID"])
     request_body = time_entry_extended_request_factory(workspace_id)
     expected_result = set(MeTimeEntryResponse.model_fields.keys())
-    project = i_authed_workspace.create_project(workspace_id, name=fake.uuid4())
+    project = i_authed_workspace.create_project(workspace_id, name=str(fake.uuid4()))
 
     result = i_authed_workspace.create_time_entry(
         workspace_id,
diff --git a/tests/integration/test_user.py b/tests/integration/test_user.py
index e06f8b4..4eb8ad7 100644
--- a/tests/integration/test_user.py
+++ b/tests/integration/test_user.py
@@ -66,14 +66,12 @@ def test_me__with_related_data(i_authed_user: CurrentUser) -> None:
     argvalues=[
         ("beginning_of_week", fake.random_int(min=0, max=6)),
         ("country_id", fake.random_int(min=100, max=200)),
-        ("email", fake.email()),
         ("fullname", fake.name()),
         ("timezone", fake.timezone()),
     ],
     ids=(
         "beginning_of_week",
         "country_id",
-        "email",
         "fullname",
         "timezone",
     ),
@@ -85,6 +83,7 @@ def test_update_me__ok(
     field_value: Union[str, int],
 ) -> None:
     # default_workspace_id is not tested because it requires method to create and delete workspace
+    # `email` is skipped because changing it leads to flaky tests
     update_body = {field_name: field_value}
     current_state_body = {field_name: getattr(me_response, field_name)}
 
diff --git a/tests/responses/project_get.py b/tests/responses/project_get.py
index c2ad9f1..d3a3285 100644
--- a/tests/responses/project_get.py
+++ b/tests/responses/project_get.py
@@ -23,7 +23,6 @@
     "is_private": True,
     "is_shared": False,
     "name": "test project",
-    "permissions": None,
     "rate": None,
     "rate_last_updated": None,
     "recurring": False,
diff --git a/tests/responses/time_entry_get.py b/tests/responses/time_entry_get.py
index 246508a..6dc1f34 100644
--- a/tests/responses/time_entry_get.py
+++ b/tests/responses/time_entry_get.py
@@ -29,7 +29,6 @@
     "duration": 22,
     "duronly": True,
     "id": 3544298808,
-    "permissions": None,
     "project_id": None,
     "server_deleted_at": None,
     "start": "2024-07-29T12:28:33+00:00",
diff --git a/tests/responses/workspace_get.py b/tests/responses/workspace_get.py
index 766f8eb..c072a7c 100644
--- a/tests/responses/workspace_get.py
+++ b/tests/responses/workspace_get.py
@@ -23,7 +23,6 @@
     "only_admins_see_billable_rates": False,
     "only_admins_see_team_dashboard": False,
     "organization_id": 8364520,
-    "permissions": None,
     "premium": False,
     "profile": 0,
     "projects_billable_by_default": True,
diff --git a/toggl_python/schemas/project.py b/toggl_python/schemas/project.py
index 19ac5be..66ecec0 100644
--- a/toggl_python/schemas/project.py
+++ b/toggl_python/schemas/project.py
@@ -30,7 +30,6 @@ class ProjectResponse(BaseSchema):
     is_private: bool
     is_shared: bool
     name: str
-    permissions: Optional[str]
     rate: Optional[int]
     rate_last_updated: Optional[datetime]
     recurring: bool
diff --git a/toggl_python/schemas/time_entry.py b/toggl_python/schemas/time_entry.py
index 428de98..8444933 100644
--- a/toggl_python/schemas/time_entry.py
+++ b/toggl_python/schemas/time_entry.py
@@ -45,7 +45,6 @@ class MeTimeEntryResponse(MeTimeEntryResponseBase):
     duration: int
     duronly: bool
     id: int
-    permissions: Optional[List]
     server_deleted_at: Optional[datetime]
     start: datetime
     stop: Optional[datetime]
diff --git a/toggl_python/schemas/workspace.py b/toggl_python/schemas/workspace.py
index 260eec1..9819218 100644
--- a/toggl_python/schemas/workspace.py
+++ b/toggl_python/schemas/workspace.py
@@ -27,7 +27,6 @@ class WorkspaceResponseBase(BaseSchema):
     only_admins_see_billable_rates: bool
     only_admins_see_team_dashboard: bool
     organization_id: int
-    permissions: Optional[List[str]]
     premium: bool
     projects_billable_by_default: bool
     projects_enforce_billable: bool