diff --git a/pkgs/development/python-modules/ciscoconfparse/default.nix b/pkgs/development/python-modules/ciscoconfparse/default.nix
index 1643c6acfa47..478591d51df3 100644
--- a/pkgs/development/python-modules/ciscoconfparse/default.nix
+++ b/pkgs/development/python-modules/ciscoconfparse/default.nix
@@ -15,13 +15,13 @@
 buildPythonPackage rec {
   pname = "ciscoconfparse";
   version = "1.7.24";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "mpenning";
-    repo = pname;
+    repo = "ciscoconfparse";
     rev = "refs/tags/${version}";
     hash = "sha256-vL/CQdYcOP356EyRToviWylP1EBtxmeov6qkhfQNZ2Y=";
   };
@@ -35,16 +35,14 @@ buildPythonPackage rec {
     sed -i '/requires-python/d' pyproject.toml
 
     substituteInPlace pyproject.toml \
-      --replace '"poetry>=1.3.2",' ""
+      --replace-fail '"poetry>=1.3.2",' ""
 
     patchShebangs tests
   '';
 
-  nativeBuildInputs = [
-    poetry-core
-  ];
+  build-system = [ poetry-core ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     passlib
     deprecat
     dnspython