diff --git a/geoengine/workflow.py b/geoengine/workflow.py
index fd08f377..65bd8da8 100644
--- a/geoengine/workflow.py
+++ b/geoengine/workflow.py
@@ -25,7 +25,8 @@
 from owslib.util import Authentication, ResponseWrapper
 from owslib.wcs import WebCoverageService
 from vega import VegaLite
-import websockets
+from websockets.asyncio.client import connect
+from websockets import protocol, exceptions as ws_exceptions
 import xarray as xr
 import pyarrow as pa
 
@@ -554,7 +555,7 @@ async def raster_stream(
         query_rectangle: QueryRectangle,
         open_timeout: int = 60,
         bands: Optional[List[int]] = None  # TODO: move into query rectangle?
-    ) -> AsyncIterator[RasterTile2D]:
+    ):
         '''Stream the workflow result as series of RasterTile2D (transformable to numpy and xarray)'''
 
         if bands is None:
@@ -584,21 +585,21 @@ async def raster_stream(
         if url is None:
             raise InputException('Invalid websocket url')
 
-        async with websockets.asyncio.client.connect(
+        async with connect(
             uri=self.__replace_http_with_ws(url),
-            extra_headers=session.auth_header,
+            additional_headers=session.auth_header,
             open_timeout=open_timeout,
             max_size=None,
         ) as websocket:
 
             tile_bytes: Optional[bytes] = None
 
-            while websocket.state == websockets.protocol.State.OPEN:
+            while websocket.state == protocol.State.OPEN:
                 async def read_new_bytes() -> Optional[bytes]:
                     # already send the next request to speed up the process
                     try:
                         await websocket.send("NEXT")
-                    except websockets.exceptions.ConnectionClosed:
+                    except ws_exceptions.ConnectionClosed:
                         # the websocket connection is already closed, we cannot read anymore
                         return None
 
@@ -610,7 +611,7 @@ async def read_new_bytes() -> Optional[bytes]:
                             raise GeoEngineException({'error': data})
 
                         return data
-                    except websockets.exceptions.ConnectionClosedOK:
+                    except ws_exceptions.ConnectionClosedOK:
                         # the websocket connection closed gracefully, so we stop reading
                         return None
 
@@ -791,21 +792,21 @@ def process_bytes(batch_bytes: Optional[bytes]) -> Optional[gpd.GeoDataFrame]:
         if url is None:
             raise InputException('Invalid websocket url')
 
-        async with websockets.asyncio.client.connect(
+        async with connect(
             uri=self.__replace_http_with_ws(url),
-            extra_headers=session.auth_header,
+            additional_headers=session.auth_header,
             open_timeout=open_timeout,
             max_size=None,  # allow arbitrary large messages, since it is capped by the server's chunk size
         ) as websocket:
 
             batch_bytes: Optional[bytes] = None
 
-            while websocket.state == websockets.protocol.State.OPEN:
+            while websocket.state == protocol.State.OPEN:
                 async def read_new_bytes() -> Optional[bytes]:
                     # already send the next request to speed up the process
                     try:
                         await websocket.send("NEXT")
-                    except websockets.exceptions.ConnectionClosed:
+                    except ws_exceptions.ConnectionClosed:
                         # the websocket connection is already closed, we cannot read anymore
                         return None
 
@@ -817,7 +818,7 @@ async def read_new_bytes() -> Optional[bytes]:
                             raise GeoEngineException({'error': data})
 
                         return data
-                    except websockets.exceptions.ConnectionClosedOK:
+                    except ws_exceptions.ConnectionClosedOK:
                         # the websocket connection closed gracefully, so we stop reading
                         return None