diff --git a/pkgs/development/python-modules/uart-devices/default.nix b/pkgs/development/python-modules/uart-devices/default.nix
index 3005eb14e7d2..c2081edc3c58 100644
--- a/pkgs/development/python-modules/uart-devices/default.nix
+++ b/pkgs/development/python-modules/uart-devices/default.nix
@@ -4,7 +4,7 @@
   fetchFromGitHub,
   poetry-core,
   pytest-asyncio,
-  pythonOlder,
+  pytest-cov-stub,
   pytestCheckHook,
 }:
 
@@ -13,8 +13,6 @@ buildPythonPackage rec {
   version = "0.1.1";
   pyproject = true;
 
-  disabled = pythonOlder "3.8";
-
   src = fetchFromGitHub {
     owner = "bdraco";
     repo = "uart-devices";
@@ -22,15 +20,11 @@ buildPythonPackage rec {
     hash = "sha256-vBwQXeXw9y7eETtlC4dcqGytIgrAm7iomnvoaxhl6JI=";
   };
 
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace-fail "-Wdefault --cov=uart_devices --cov-report=term-missing:skip-covered" ""
-  '';
-
-  nativeBuildInputs = [ poetry-core ];
+  build-system = [ poetry-core ];
 
   nativeCheckInputs = [
     pytest-asyncio
+    pytest-cov-stub
     pytestCheckHook
   ];