diff --git a/backend/tests/test_coverage_gaps.py b/backend/tests/test_coverage_gaps.py
index 5fb85a5..53dce2a 100644
--- a/backend/tests/test_coverage_gaps.py
+++ b/backend/tests/test_coverage_gaps.py
@@ -522,20 +522,21 @@ async def test_holiday_dates_cover_year_boundary(
     assert r.status_code == 200, r.text
 
     await db_session.execute(text("SET LOCAL app.bypass_rls = 'on'"))
-    await ensure_holidays_for_year(2027, "BY", db_session)
     await ensure_holidays_for_year(2028, "BY", db_session)
+    await ensure_holidays_for_year(2029, "BY", db_session)
     await db_session.commit()
 
-    # Di 28.12.2027 - Sa 01.01.2028: Wochentage Di/Mi/Do/Fr (29./30./31.12., 01.01.),
-    # davon Neujahr (01.01.2028) ein Feiertag -> 3 Werktage
-    start = date(2027, 12, 28)
-    end = date(2028, 1, 1)
+    # Do 28.12.2028 - Mo 01.01.2029: Wochentage Do/Fr (28./29.12.) + Mo (01.01.),
+    # Sa/So (30./31.12.) fallen ohnehin raus. Montag 01.01.2029 ist Neujahr
+    # (Feiertag) -> 2 Werktage.
+    start = date(2028, 12, 28)
+    end = date(2029, 1, 1)
     resp = await client.post("/api/v1/absences/", json={
         "type_id": str(cov_vacation_type_id), "start_date": str(start), "end_date": str(end),
     }, headers=cov_headers)
     assert resp.status_code == 201, resp.text
     data = resp.json()
-    assert data["working_days"] == 3, (
+    assert data["working_days"] == 2, (
         f"Neujahr (Folgejahr) muss aus working_days herausgerechnet werden, "
         f"got {data['working_days']}"
     )