diff --git a/pkgs/development/python-modules/django-markup/default.nix b/pkgs/development/python-modules/django-markup/default.nix
index 6d7dd7f59453..dce53f40ad93 100644
--- a/pkgs/development/python-modules/django-markup/default.nix
+++ b/pkgs/development/python-modules/django-markup/default.nix
@@ -3,6 +3,11 @@
   buildPythonPackage,
   fetchFromGitHub,
   pythonOlder,
+
+  # build-system
+  poetry-core,
+
+  # dependencies
   django,
 
   # optionals
@@ -21,7 +26,7 @@
 
 buildPythonPackage rec {
   pname = "django-markup";
-  version = "1.8.1";
+  version = "1.9";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
@@ -30,14 +35,16 @@ buildPythonPackage rec {
     owner = "bartTC";
     repo = "django-markup";
     rev = "refs/tags/v${version}";
-    hash = "sha256-Hhcp4wVJEcYV1lEZ2jWf7nOlt5m4lVAfC6VmKIdxf4c=";
+    hash = "sha256-HSszXZ86hLxRgBZHIs1TA7F7MHLlS58oAhG50yrTquE=";
   };
 
   postPatch = ''
     sed -i "/--cov/d" pyproject.toml
   '';
 
-  buildInputs = [ django ];
+  build-system = [ poetry-core ];
+
+  dependencies = [ django ];
 
   passthru.optional-dependencies = {
     all_filter_dependencies = [
@@ -58,7 +65,9 @@ buildPythonPackage rec {
     pytestCheckHook
   ] ++ passthru.optional-dependencies.all_filter_dependencies;
 
-  env.DJANGO_SETTINGS_MODULE = "django_markup.tests";
+  preCheck = ''
+    export DJANGO_SETTINGS_MODULE=django_markup.tests
+  '';
 
   meta = with lib; {
     description = "Generic Django application to convert text with specific markup to html";