diff --git a/poetry.lock b/poetry.lock
index 696c5e79..3899a98e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.4 and should not be changed by hand.
 
 [[package]]
 name = "aiohappyeyeballs"
diff --git a/src/twentemilieu/twentemilieu.py b/src/twentemilieu/twentemilieu.py
index e39675c3..f3f4c731 100644
--- a/src/twentemilieu/twentemilieu.py
+++ b/src/twentemilieu/twentemilieu.py
@@ -22,6 +22,8 @@
     TwenteMilieuError,
 )
 
+TIMEZONE_INFO = ZoneInfo("Europe/Amsterdam")
+
 
 class WasteType(IntEnum):
     """Enum for the types of waste."""
@@ -169,16 +171,15 @@ async def update(self) -> dict[WasteType, list[date]]:
         """
         await self.unique_id()
 
-        timezone = ZoneInfo("Europe/Amsterdam")
         response = await self._request(
             "GetCalendar",
             data={
                 "companyCode": self.company_code,
                 "uniqueAddressID": self._unique_id,
-                "startDate": (datetime.now(tz=timezone) - timedelta(days=1))
+                "startDate": (datetime.now(tz=TIMEZONE_INFO) - timedelta(days=1))
                 .date()
                 .isoformat(),
-                "endDate": (datetime.now(tz=timezone) + timedelta(days=365))
+                "endDate": (datetime.now(tz=TIMEZONE_INFO) + timedelta(days=365))
                 .date()
                 .isoformat(),
             },
@@ -197,7 +198,7 @@ async def update(self) -> dict[WasteType, list[date]]:
                         pickup_date_raw,
                         "%Y-%m-%dT%H:%M:%S",
                     )
-                    .replace(tzinfo=timezone)
+                    .replace(tzinfo=TIMEZONE_INFO)
                     .date()
                 )
                 pickups[waste_type].append(pickup_date)