diff --git a/pyproject.toml b/pyproject.toml
index e8e3a25c..b445b82b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,6 @@ dependencies = [
     "urllib3>=2.4.0",
     "websockets>=15.0.1",
     "python-socks>=2.7.1", # dingtalk missing dependency
-    "taskgroup==0.0.0a4", # graingert/taskgroup#20
     "pip>=25.1.1",
     "ruff>=0.11.9",
     "pre-commit>=4.2.0",
diff --git a/src/langbot/pkg/api/http/controller/groups/platform/adapters.py b/src/langbot/pkg/api/http/controller/groups/platform/adapters.py
index 4136791c..b46e5263 100644
--- a/src/langbot/pkg/api/http/controller/groups/platform/adapters.py
+++ b/src/langbot/pkg/api/http/controller/groups/platform/adapters.py
@@ -1,6 +1,7 @@
 import quart
-
+import mimetypes
 from ... import group
+from langbot.pkg.utils import importutil
 
 
 @group.group_class('adapters', '/api/v1/platform/adapters')
@@ -31,4 +32,6 @@ class AdaptersRouterGroup(group.RouterGroup):
             if icon_path is None:
                 return self.http_status(404, -1, 'icon not found')
 
-            return await quart.send_file(icon_path)
+            return quart.Response(
+                importutil.read_resource_file_bytes(icon_path), mimetype=mimetypes.guess_type(icon_path)[0]
+            )
diff --git a/src/langbot/pkg/api/http/controller/groups/provider/requesters.py b/src/langbot/pkg/api/http/controller/groups/provider/requesters.py
index af9e1540..268ed11d 100644
--- a/src/langbot/pkg/api/http/controller/groups/provider/requesters.py
+++ b/src/langbot/pkg/api/http/controller/groups/provider/requesters.py
@@ -1,6 +1,8 @@
 import quart
+import mimetypes
 
 from ... import group
+from langbot.pkg.utils import importutil
 
 
 @group.group_class('provider/requesters', '/api/v1/provider/requesters')
@@ -32,4 +34,6 @@ class RequestersRouterGroup(group.RouterGroup):
             if icon_path is None:
                 return self.http_status(404, -1, 'icon not found')
 
-            return await quart.send_file(icon_path)
+            return quart.Response(
+                importutil.read_resource_file_bytes(icon_path), mimetype=mimetypes.guess_type(icon_path)[0]
+            )
diff --git a/src/langbot/pkg/utils/importutil.py b/src/langbot/pkg/utils/importutil.py
index 6feebd3e..a35052a6 100644
--- a/src/langbot/pkg/utils/importutil.py
+++ b/src/langbot/pkg/utils/importutil.py
@@ -41,5 +41,9 @@ def read_resource_file(resource_path: str) -> str:
         return f.read()
 
 
+def read_resource_file_bytes(resource_path: str) -> bytes:
+    return importlib.resources.files('langbot').joinpath(resource_path).read_bytes()
+
+
 def list_resource_files(resource_path: str) -> list[str]:
     return [f.name for f in importlib.resources.files('langbot').joinpath(resource_path).iterdir()]