diff --git a/aiocloudweather/proxy.py b/aiocloudweather/proxy.py
index 79de681..8cf29d5 100644
--- a/aiocloudweather/proxy.py
+++ b/aiocloudweather/proxy.py
@@ -21,15 +21,10 @@ def __init__(self, proxied_sinks: list[DataSink], dns_servers: list[str]):
         self.proxied_sinks = proxied_sinks
         self.session = ClientSession(connector=TCPConnector(resolver=resolver))
 
-    def __del__(self):
-        """Close the session when the object is deleted."""
-        if not self.session.closed:
-            self.session.close()
-
-    def close(self):
+    async def close(self):
         """Close the session."""
         if not self.session.closed:
-            self.session.close()
+            await self.session.close()
 
     async def forward_wunderground(self, request: web.Request) -> web.Response:
         """Forward Wunderground data to their API."""
diff --git a/aiocloudweather/server.py b/aiocloudweather/server.py
index 8f04720..5656fb0 100644
--- a/aiocloudweather/server.py
+++ b/aiocloudweather/server.py
@@ -54,7 +54,7 @@ def __init__(
         # storage
         self.stations: list[str] = []
 
-    def update_config(
+    async def update_config(
         self,
         proxy_sinks: list[DataSink] | None = None,
         dns_servers: list[str] | None = None,
@@ -62,7 +62,8 @@ def update_config(
         """Update the proxy configuration."""
         self.proxy_enabled = proxy_sinks and len(proxy_sinks) > 0
         if self.proxy_enabled:
-            self.proxy.close()
+            if self.proxy:
+                await self.proxy.close()
             self.proxy = CloudWeatherProxy(proxy_sinks, dns_servers or ["9.9.9.9"])
 
     async def _new_dataset_cb(self, dataset: WeatherStation) -> None: