diff --git a/aleksis/apps/chronos/managers.py b/aleksis/apps/chronos/managers.py
index 82413130acaa2ae90188f3b4b821de295076a8a1..7502b71a2f9a0860347bda94c2b368a7eaa55d06 100644
--- a/aleksis/apps/chronos/managers.py
+++ b/aleksis/apps/chronos/managers.py
@@ -210,7 +210,6 @@ class BreakManager(CurrentSiteManager):
 class WeekQuerySetMixin:
     def annotate_week(self, week: Union[CalendarWeek]):
         """Annotate all lessons in the QuerySet with the number of the provided calendar week."""
-
         return self.annotate(
             _week=models.Value(week.week, models.IntegerField()),
             _year=models.Value(week.year, models.IntegerField()),
diff --git a/aleksis/apps/chronos/models.py b/aleksis/apps/chronos/models.py
index 326f51f34f62900c77f5b87f482f735ec5af7c04..d095c9b1d38d46c6ed66709774560b60a59b22ee 100644
--- a/aleksis/apps/chronos/models.py
+++ b/aleksis/apps/chronos/models.py
@@ -17,11 +17,7 @@ from django.utils.functional import classproperty
 from django.utils.translation import gettext_lazy as _
 
 from cache_memoize import cache_memoize
-from calendarweek.django import (
-    CalendarWeek,
-    i18n_day_abbr_choices_lazy,
-    i18n_day_name_choices_lazy,
-)
+from calendarweek.django import CalendarWeek, i18n_day_abbr_choices_lazy, i18n_day_name_choices_lazy
 from colorfield.fields import ColorField
 from django_global_request.middleware import get_request
 
diff --git a/aleksis/apps/chronos/util/date.py b/aleksis/apps/chronos/util/date.py
index 159f8e4cbfa08df8d5bf286b141e482591bfc658..d25375c7916abdc7664dad085704076eab5d1d5b 100644
--- a/aleksis/apps/chronos/util/date.py
+++ b/aleksis/apps/chronos/util/date.py
@@ -1,5 +1,5 @@
 from datetime import date
-from typing import List, Tuple, Union
+from typing import List, Tuple
 
 from django.utils import timezone
 
@@ -37,5 +37,4 @@ def get_weeks_for_year(year: int) -> List[CalendarWeek]:
 
 def get_current_year() -> int:
     """Get current year."""
-
     return timezone.now().year
diff --git a/poetry.lock b/poetry.lock
index b45b86156fbbdd7203f87396cc98a07670b4eebb..a31e475d9aa3dfeff6610675d2d419a9328bcb61 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1950,7 +1950,7 @@ testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2.3)", "pyt
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "fbd9b5a34e8697bf139045114e1ae736295514352dfa4befb00fa206d7e82cd5"
+content-hash = "3ea95d61a58689b29cfd951e057fb15db09c21351ac9502acffeb9e478178468"
 
 [metadata.files]
 alabaster = [
diff --git a/pyproject.toml b/pyproject.toml
index a702ad804b3f80840a568507c3ee559b11420f47..d8a1e7b0e1799ce2227b6829f38e2c150675f520 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ secondary = true
 [tool.poetry.dependencies]
 python = "^3.7"
 calendarweek = "^0.4.6"
-aleksis-core = "^2.0a3.dev0+20201114132749.88d92354"
+aleksis-core = "^2.0a3"
 
 [tool.poetry.dev-dependencies]
 sphinx = "^3.0"