diff --git a/pkgs/development/python-modules/sanic/default.nix b/pkgs/development/python-modules/sanic/default.nix
index a4c8742fc153..0738dddcd0be 100644
--- a/pkgs/development/python-modules/sanic/default.nix
+++ b/pkgs/development/python-modules/sanic/default.nix
@@ -26,16 +26,19 @@
 
 buildPythonPackage rec {
   pname = "sanic";
-  version = "25.3.0";
+  version = "25.12.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "sanic-org";
     repo = "sanic";
     tag = "v${version}";
-    hash = "sha256-tucLXWYPpALQrPYf+aiovKHYf2iouu6jezvNdukEu9w=";
+    hash = "sha256-ygMTULkavd/5Mqxn/iS1TC29hfFcF6q3/kT8S7V1Xdo=";
   };
 
+  # test compat for testing with pytest-asyncio
+  patches = [ ./pytest9-compat.patch ];
+
   build-system = [ setuptools ];
 
   dependencies = [
@@ -59,7 +62,7 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     beautifulsoup4
     gunicorn
-    pytest-asyncio
+    pytest-asyncio # upstream tests with anyio + pytest-sanic instead
     pytestCheckHook
     sanic-testing
     uvicorn
@@ -101,6 +104,9 @@ buildPythonPackage rec {
     "test_create_server_trigger_events"
     "test_multiple_uvloop_configs_display_warning"
     "test_uvloop_cannot_never_called_with_create_server"
+    # Our mailcap database has a different mime type name for xml documentations
+    # AssertionError: assert 'text/xml; charset=utf-8' == 'application/xml'
+    "test_guess_content_type"
   ];
 
   disabledTestPaths = [
diff --git a/pkgs/development/python-modules/sanic/pytest9-compat.patch b/pkgs/development/python-modules/sanic/pytest9-compat.patch
new file mode 100644
index 000000000000..1f47760614ad
--- /dev/null
+++ b/pkgs/development/python-modules/sanic/pytest9-compat.patch
@@ -0,0 +1,21 @@
+diff --git a/tests/http3/test_http_receiver.py b/tests/http3/test_http_receiver.py
+index 9641791b..29cf3926 100644
+--- a/tests/http3/test_http_receiver.py
++++ b/tests/http3/test_http_receiver.py
+@@ -1,6 +1,7 @@
+ from unittest.mock import Mock
+ 
+ import pytest
++import pytest_asyncio
+ 
+ from aioquic.h3.connection import H3Connection
+ from aioquic.h3.events import DataReceived, HeadersReceived
+@@ -27,7 +28,7 @@ except ImportError:
+ pytestmark = pytest.mark.asyncio
+ 
+ 
+-@pytest.fixture(autouse=True)
++@pytest_asyncio.fixture(autouse=True)
+ async def setup(app: Sanic):
+     @app.get("/")
+     async def handler(*_):