diff --git a/pkgs/development/python-modules/marshmallow-polyfield/default.nix b/pkgs/development/python-modules/marshmallow-polyfield/default.nix
index aa2784cd1dbb..6b5394ac2770 100644
--- a/pkgs/development/python-modules/marshmallow-polyfield/default.nix
+++ b/pkgs/development/python-modules/marshmallow-polyfield/default.nix
@@ -1,32 +1,43 @@
-{ buildPythonPackage
+{ lib
+, buildPythonPackage
 , fetchFromGitHub
-, lib
 , marshmallow
-  # Check Inputs
+, pythonOlder
 , pytestCheckHook
-, pytest-cov
 }:
 
 buildPythonPackage rec {
   pname = "marshmallow-polyfield";
-  version = "5.9";
+  version = "5.10";
+
+  disabled = pythonOlder "3.6";
 
   src = fetchFromGitHub {
     owner = "Bachmann1234";
     repo = pname;
     rev = "v${version}";
-    sha256 = "15yx8ib5yx1xx6kq8wnfdmv9zm43k7y33c6zpq5rba6a30v4lcnd";
+    sha256 = "sha256-oF5LBuDK4kqsAcKwidju+wFjigjy4CNbJ6bfWpGO1yQ=";
   };
 
   propagatedBuildInputs = [
     marshmallow
   ];
 
-  # setuptools check can run, but won't find tests
-  checkInputs = [ pytestCheckHook pytest-cov ];
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "--cov=marshmallow_polyfield" ""
+  '';
+
+  pythonImportsCheck = [
+    "marshmallow"
+  ];
 
   meta = with lib; {
-    description = "An unofficial extension to Marshmallow to allow for polymorphic fields";
+    description = "Extension to Marshmallow to allow for polymorphic fields";
     homepage = "https://github.com/Bachmann1234/marshmallow-polyfield";
     license = licenses.asl20;
     maintainers = with maintainers; [ drewrisinger ];