diff --git a/src/bmkg/api/api.py b/src/bmkg/api/api.py
index eb37f9c..e126065 100644
--- a/src/bmkg/api/api.py
+++ b/src/bmkg/api/api.py
@@ -1,3 +1,7 @@
+from traceback import TracebackException
+from types import TracebackType
+from typing import Self
+
 from aiohttp import ClientSession
 
 __all__ = ["API"]
@@ -12,3 +16,17 @@ def __init__(self, session: ClientSession | None = None) -> None:
         self._session = (
             session if session is not None else ClientSession("https://data.bmkg.go.id")
         )
+
+    async def __aenter__(self) -> Self:
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: Exception,
+        exc_val: TracebackException,
+        traceback: TracebackType,
+    ) -> None:
+        await self.close()
+
+    async def close(self) -> None:
+        await self._session.close()
diff --git a/src/bmkg/api/bmkg.py b/src/bmkg/api/bmkg.py
index a6afc21..392d959 100644
--- a/src/bmkg/api/bmkg.py
+++ b/src/bmkg/api/bmkg.py
@@ -1,6 +1,4 @@
-from traceback import TracebackException
-from types import TracebackType
-from typing import Self
+from aiohttp import ClientSession
 
 from .api import API
 from .earthquake import Earthquake
@@ -18,22 +16,8 @@ class BMKG(API):
         weather_forecast (WeatherForecast): weather forecast api interface.
     """
 
-    def __init__(self) -> None:
-        API.__init__(self)
+    def __init__(self, session: ClientSession | None = None) -> None:
+        API.__init__(self, session)
 
         self.earthquake = Earthquake(self._session)
         self.weather_forecast = WeatherForecast(self._session)
-
-    async def __aenter__(self) -> Self:
-        return self
-
-    async def __aexit__(
-        self,
-        exc_type: Exception,
-        exc_val: TracebackException,
-        traceback: TracebackType,
-    ) -> None:
-        await self.close()
-
-    async def close(self) -> None:
-        await self._session.close()
diff --git a/src/bmkg/api/earthquake.py b/src/bmkg/api/earthquake.py
index 9ef789a..8a02776 100644
--- a/src/bmkg/api/earthquake.py
+++ b/src/bmkg/api/earthquake.py
@@ -43,7 +43,7 @@ async def get_latest_earthquake(self) -> schemas.LatestEarthquake:
             latest_earthquake = parse_latest_earthquake_data(await response.json())  # type: ignore
 
             latest_earthquake.shakemap = Shakemap(
-                self._session, latest_earthquake.shakemap.file_name
+                latest_earthquake.shakemap.file_name, self._session
             )
 
             return latest_earthquake
diff --git a/src/bmkg/api/shakemap.py b/src/bmkg/api/shakemap.py
index 0cb2c90..177d25c 100644
--- a/src/bmkg/api/shakemap.py
+++ b/src/bmkg/api/shakemap.py
@@ -13,7 +13,7 @@ class Shakemap(API, schemas.Shakemap):
 
     url = "/DataMKG/TEWS"
 
-    def __init__(self, session: ClientSession, file_name: str) -> None:
+    def __init__(self, file_name: str, session: ClientSession | None = None) -> None:
         API.__init__(self, session)
         schemas.Shakemap.__init__(self, file_name)