diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index d7ef4d7..99f5d62 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -68,7 +68,7 @@ jobs:
       - uses: isort/isort-action@master
         with:
           requirementsFiles: "requirements.txt requirements.dev.txt"
-      - uses: psf/black@stable
+      - uses: psf/black@23.11.0
       - name: Comment if linting failed
         if: failure()
         uses: thollander/actions-comment-pull-request@v2
diff --git a/rental_backend/routes/rental_session.py b/rental_backend/routes/rental_session.py
index e574024..1bc2759 100644
--- a/rental_backend/routes/rental_session.py
+++ b/rental_backend/routes/rental_session.py
@@ -299,7 +299,6 @@ async def accept_end_rental_session(
     dependencies=[Depends(check_sessions_expiration), Depends(check_sessions_overdue)],
 )
 async def get_rental_session(session_id: int, user=Depends(UnionAuth(scopes=["rental.session.admin"]))):
-
     rental_session: RentalSession | None = (
         RentalSession.query(session=db.session)
         .options(joinedload(RentalSession.strike))
diff --git a/requirements.dev.txt b/requirements.dev.txt
index e51c72c..336b8df 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,5 +1,5 @@
 autoflake
-black
+black==23.11.0
 httpx
 isort
 pytest