diff --git a/pkgs/development/python-modules/flatten-dict/default.nix b/pkgs/development/python-modules/flatten-dict/default.nix
index c9a55c0b5e58..03b699b3d593 100644
--- a/pkgs/development/python-modules/flatten-dict/default.nix
+++ b/pkgs/development/python-modules/flatten-dict/default.nix
@@ -4,10 +4,9 @@
   fetchFromGitHub,
   poetry-core,
   pytestCheckHook,
-  six,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "flatten-dict";
   version = "0.5.0";
   pyproject = true;
@@ -15,13 +14,11 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "ianlini";
     repo = "flatten-dict";
-    rev = version;
+    tag = finalAttrs.version;
     hash = "sha256-wzCuTnLOOeybhBPcyyPNPKWoJBHwaKkmARTzlg87wtU=";
   };
 
-  nativeBuildInputs = [ poetry-core ];
-
-  propagatedBuildInputs = [ six ];
+  build-system = [ poetry-core ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
@@ -30,7 +27,8 @@ buildPythonPackage rec {
   meta = {
     description = "Module for flattening and unflattening dict-like objects";
     homepage = "https://github.com/ianlini/flatten-dict";
+    changelog = "https://github.com/ianlini/flatten-dict/releases/tag/${finalAttrs.src.tag}";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})