diff --git a/pkgs/development/python-modules/cert-chain-resolver/default.nix b/pkgs/development/python-modules/cert-chain-resolver/default.nix
index eea43d5c7393..6491749498bd 100644
--- a/pkgs/development/python-modules/cert-chain-resolver/default.nix
+++ b/pkgs/development/python-modules/cert-chain-resolver/default.nix
@@ -1,35 +1,50 @@
 { lib
-, fetchFromGitHub
 , buildPythonPackage
+, cryptography
+, fetchFromGitHub
 , pytestCheckHook
 , pytest-mock
-, cryptography
+, pythonOlder
+, six
 }:
 
 buildPythonPackage rec {
   pname = "cert-chain-resolver";
   version = "1.0.1";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "rkoopmans";
     repo = "python-certificate-chain-resolver";
     rev = version;
-    sha256 = "1kmig4ksbx1wvgcjn4r9jjg2pn1ag5rq871bjwxkp9kslb3x3d1l";
+    hash = "sha256-NLTRx6J6pjs7lyschHN5KtgrnpQpEyvZ2zz0pSd5sc4=";
   };
 
-  propagatedBuildInputs = [ cryptography ];
+  propagatedBuildInputs = [
+    cryptography
+  ];
 
-  checkInputs = [ pytestCheckHook pytest-mock ];
+  checkInputs = [
+    pytestCheckHook
+    pytest-mock
+    six
+  ];
 
-  # online tests
   disabledTests = [
+    # Tests require network access
     "test_cert_returns_completed_chain"
     "test_display_flag_is_properly_formatted"
   ];
 
+  pythonImportsCheck = [
+    "cert_chain_resolver"
+  ];
+
   meta = with lib; {
-    homepage = "https://github.com/rkoopmans/python-certificate-chain-resolver";
     description = "Resolve / obtain the certificate intermediates of a x509 certificate";
+    homepage = "https://github.com/rkoopmans/python-certificate-chain-resolver";
     license = licenses.mit;
     maintainers = with maintainers; [ veehaitch ];
   };